Workshop Repair Manual
Workshop Repair Manual
Technical Note 3736A
Diesel Engine G9T - G9U
High Pressure - Common Rail
4 cast iron cylinders
Vehicle
Type
Engine
Master
XDXG
XDXN
XDXN
XDXM
XDXU - XDXM
XDXM
XDXU
XDXV
G9T 720
G9T 722
G9T 750
G9U 720
G9U 724
G9U 750
G9U 754
Espace (JE0X)
XE0K - XE0S
G9T 710
Espace IV
JK0H
G9T 742, 743
Laguna II
XG0F
G9T 700, 702, 703
Vel Satis
BJ0E - BJ0F - BJ0G - BJ0M
BJ0F - BJ0G
BJ0F
G9T 702
G9T 700, 701
G9T 703
Avantime
DE01
G9T 712
Trafic
XLXD
G9U 730
Supersedes Workshop Repair Manual MOT. G9T
77 11 321 202
APRIL 2003
"The repair methods given by the manufacturer in this document are based on the
technical specifications current when it was prepared.
EDITION ANGLAISE
All copyrights reserved by RENAULT.
The methods may be modified as a result of changes introduced by the manufacturer
in the production of the various component units and accessories from which his
vehicles are constructed."
Copying or translating, in part or in full, of this document or use of the service part
reference numbering system is forbidden without the prior written authority of
RENAULT.
© RENAULT 2002
Contents
Page
Page
10A ENGINE AND PERIPHERALS
Preface
Cleanliness - Safety
Engine identification
Tightening torques (in daNm
or degrees)
Specifications
Cylinder head
Pistons
Con rods
Crankshaft
Bearing shells
Piston base cooling jets
Preparing the engine to be mounted
on the support
Consumables
Precaution
Parts to be replaced after removal
Standard replacement
Special tooling required
Equipment required
10A-1
10A-2
10A-10
10A-13
10A-17
10A-26
10A-29
10A-31
10A-32
10A-33
10A-34
10A-38
10A-38
10A-38
10A-39
10A-40
10A-45
Overhauling the engine
Removing the upper engine
Adjusting the timing
Removing the injector holders
Dismantling the cylinder head
Cleaning
Checking the gasket face
Checking the camshaft longitudinal
clearance
Reassembling the cylinder head
Removing the peripherals
Extracting the gudgeon pins
Fitting con rod bearing shells
Refitting the peripherals
Con rods/piston assembly
Fitting the piston rings
Replacing the oil pump drive pin oil
deflector
Fitting the flywheel end crankshaft
seal
Special notes concerning engines
equipped with balance shafts
Special notes concerning engines
not equipped with balance shafts
Fitting the intermediate shaft roll
pins
Replacing the play compensation
sprockets
Method for replacing the high
pressure pump sprocket
Fitting intermediate shaft No. 2 seal
and the timing end crankshaft seal
Fitting the flywheel end crankshaft
seal
Refitting the upper engine
Inlet rocker shaft
Exhaust rocker shaft
Fitting the camshaft seals
Timing adjustment method
Timing belt tension
Checking the tension and timing
10A-47
10A-50
10A-61
10A-64
10A-66
10A-66
10A-67
10A-68
10A-72
10A-75
10A-75
10A-79
10A-88
10A-95
10A-96
10A-96
10A-100
10A-107
10A-111
10A-114
10A-116
10A-119
10A-123
10A-123
10A-124
10A-124
10A-138
10A-147
10A-149
10A-151
ENGINE AND PERIPHERALS
110A
Foreword
USING THE MANUAL
There are two main sections in this manual:
– technical specifications,
– overhauling the engine.
For repairing vehicle components, refer to the
Workshop Repair Manual and Technical Notes for
the vehicle.
UNITS OF MEASUREMENT
– All dimensions are given in millimetres (mm) (unless
stated otherwise).
– Tightening torques are expressed in
decaNewtonmetres (daNm).
Reminder: 1 daNm = 1.02 m.kg.
– Pressures in bar
Reminder: 1 bar = 100,000 Pa.
TOLERANCES
Tightening torques given without a tolerance must be
accurate to within:
±3°°).
– in Degrees (±
±10 %).
– in daNm (±
10A-1
10A
ENGINE AND PERIPHERALS
Cleanliness - Safety
OPERATION
The "Common Rail" high pressure direct injection
system is a sequential diesel fuel injection system
(based on the petrol engine multipoint injection
system).
This new injection system reduces operating noise,
reduces the volume of pollutant gases and particles
and produces high engine torque at low engine speeds
thanks to a pre-injection process.
The low pressure pump (also called the booster pump)
supplies the high pressure pump via the pressure
regulator filter then the fuel filter during the starting
phase only, at a pressure of between 2 and 4 bar.
The high pressure pump generates the high
pressure, which is transmitted to the injector rail. The
pressure regulator located on the pump modulates the
high pressure pump supply flow. The rail supplies each
injector through a steel pipe.
The computer:
– determines the injection pressure value necessary
for the engine to run correctly and then controls the
pressure regulator. It checks that the pressure value
is correct by analysing the value transmitted by the
pressure sensor located on the rail,
– determines the injection timing necessary to deliver
the right quantity of diesel fuel and the moment when
injection should start,
– electrically controls each injector individually after
determining these two values.
The flow injected into the engine is determined by:
– the duration of injector control,
– the injector opening and closing speed,
– the needle stroke (determined by the type of
injector),
– the injector nominal hydraulic flow (determined by
the type of injector),
– the high pressure rail pressure, regulated by the
computer.
THE CLEANLINESS AND SAFETY ADVICE
SPECIFIED IN THIS DOCUMENT MUST BE
FOLLOWED DURING ANY WORK CARRIED OUT
ON THE HIGH PRESSURE INJECTION SYSTEM.
10A-2
10A
ENGINE AND PERIPHERALS
Cleanliness - Safety
OPERATING DIAGRAM
DESCRIPTION
The circuit comprises:
– a "pump-sender" supply unit (1) (located in the fuel tank),
– a fuel filter (2),
– a high pressure regulator (3) mounted on the pump,
– a high pressure pump (4),
– an injector rail (5) fitted with a diesel fuel pressure sensor and a pressure limiter (6),
– four solenoid injectors,
– various sensors,
– an injection computer.
Dismantling the interior of the high pressure pump and the injectors is prohibited.
10A-3
10A
ENGINE AND PERIPHERALS
Cleanliness - Safety
10A
ADVICE TO BE FOLLOWED BEFORE ANY WORK
IS CARRIED OUT ON THE INJECTION SYSTEM
CLEANLINESS ADVICE THAT MUST BE
FOLLOWED WHEN WORKING ON THE HIGH
PRESSURE DIRECT INJECTION SYSTEM
●
Protect the accessories and timing belts, the
electrical accessories (starter, alternator, electric
power assisted steering pump) and the mating face
to prevent diesel fuel spilling onto the clutch friction
plate.
●
Ensure that you have the caps for the unions to be
opened (bag of caps sold by the Parts Department part no. 77 01 206 381).
Caps are to be used once only. After use, they must
be discarded (once used they are soiled and
cleaning is not sufficient to make them reusable).
Unused caps must be discarded.
●
Ensure that you have resealable plastic bags for
storing removed parts. Parts store in these will be
less prone to contamination. These bags are single
use; after use they must be discarded.
●
Ensure that you have lint-free cleaning cloths (part
no. 77 11 211 707). Using a normal cloth or paper
for cleaning purposes is prohibited. These are not
lint-free and may contaminate the system fuel circuit.
Each cloth must be used once only.
Risks relating to contamination
The system is highly sensitive to contamination. The
risks caused by contamination are:
– damage to or destruction of the high pressure
injection system,
– a component seizing up or leaking.
All After Sales operations must be performed under
very clean conditions. This means that no impurities
(particles a few microns in size) should penetrate the
system during dismantling or get into the circuits via
the fuel unions.
The cleanliness guidelines must be applied from
the filter through to the injectors.
WHAT ARE THE SOURCES OF CONTAMINATION?
Contamination is caused by:
– metal or plastic chips,
– paint,
– fibres;
● cardboard,
● from brushes,
● from paper,
● from clothing,
● from cloths.
– foreign bodies such as hair,
– ambient air,
– etc.
WARNING
Cleaning the engine using a high pressure washer is
prohibited because of the risk of damaging
connections. Furthermore, moisture may collect in
connectors and cause electrical connection
problems.
10A-4
ENGINE AND PERIPHERALS
Cleanliness - Safety
CLEANING ADVICE TO BE FOLLOWED BEFORE
CARRYING OUT ANY WORK ON THE FUEL
CIRCUIT
●
Use fresh thinner for each operation (used thinner is
contaminated). Pour it into an uncontaminated
container.
●
For each operation, use a clean brush which is in
good condition (the brush must not lose any hairs).
●
Use a brush and thinner to clean the unions to be
opened.
●
Blow compressed air over the cleaned parts (tool and
workbench, and the parts, unions and injection
system area). Check that no bristles have been left
behind.
●
Wash your hands before and during the operation if
necessary.
●
When wearing leather protective gloves, cover them
with latex gloves.
ADVICE TO BE FOLLOWED DURING THE
OPERATION
●
As soon as the circuit is open, all openings must be
plugged to prevent system contamination. The caps
to be used are available from the Parts Department
(part no. 77 01 206 381). They must not be reused
under any circumstances.
●
Close the resealable bag, even if it has to be
reopened shortly afterwards. The ambient
atmosphere carries impurities.
●
All components removed from the injection system
must be stored in a hermetically sealed plastic bag
once they have been plugged.
●
Using a brush, thinner, air gun, swab or normal cloth
is strictly prohibited once the circuit has been
opened. These items could allow contamination to
enter the system.
●
If a component is being replaced, the new
component must not be removed from its packaging
until it is ready to be fitted on the vehicle.
10A-5
10A
ENGINE AND PERIPHERALS
Cleanliness - Safety
CAP FITTING INSTRUCTIONS (part no. 77 01 206 381)
10A-6
10A
ENGINE AND PERIPHERALS
Cleanliness - Safety
10A
RAIL PROTECTOR
Model 1
General information
The rail protector isolates the high pressure injection system from the engine compartment.
IMPORTANT
This rail protector ensures safe operation and requires special attention when being fitted.
To fulfil its safety function, the rail protector must consist of:
– two soundproofing pads (1), to be replaced if they are damaged or soaked with diesel fuel,
– a lower metal protector (2) mounted between the rail and the cylinder head,
– a diesel fuel drain pipe (3), to be replaced if damaged or soaked with diesel fuel,
– a rubber flap (4) mounted on the metal protector and the rocker cover,
– two side partitions (5),
– a partition (6) mounted on the rocker cover (on some versions),
– two clips for fixing the side partitions to the rubber flap.
Whenever working on the rail protector, make sure the system components are fitted properly after refitting.
IMPORTANT
Failure to comply with these instructions may have serious safety-related consequences.
10A-7
ENGINE AND PERIPHERALS
Cleanliness - Safety
10A
Model 2
General information
The model two rail protector fulfils the same function as model one. This protector is a development which optimises
the protection function of the high pressure injection system.
IMPORTANT
The rail protector ensures safe operation and requires special attention when being fitted.
To fulfil its safety function, the rail protector must consist of:
– two soundproofing pads (1) to be replaced if they are damaged or soaked with diesel fuel,
– a lower aluminium protector (2) mounted between the rail and the cylinder head,
– a diesel fuel drain pipe (3), to be replaced if damaged or soaked with diesel fuel,
– a plastic cover (4) mounted on the aluminium protector,
– a seal (5) to prevent leaks between the cover and rail protector.
Whenever working on the rail protector, make sure the system components are fitted properly after refitting.
IMPORTANT
Failure to comply with these instructions may have serious safety-related consequences.
10A-8
ENGINE AND PERIPHERALS
Cleanliness - Safety
POST-REPAIR CHECK
Re-prime the circuit. To do this, turn the low pressure
pump over by switching on the ignition several times,
or turn the low-pressure pump over using the fault
finding tool via the "Actuator commands" menu.
After any operation, check that there are no diesel
fuel leaks. Run the engine at idling speed until the
engine cooling fan is activated, then accelerate
several times at no load.
WARNING
The engine must not run with diesel fuel containing
more than 10% diester.
The system can inject the diesel fuel into the engine at
a pressure of up to 1350 bar. Before any operation,
check that the injector rail is depressurised.
It is vital that you observe the tightening torque:
– of the high pressure pipes,
– of the cylinder head injector,
– of the pressure sensor and pressure regulator.
When the high pressure pump, injectors and highpressure supply, return and output unions are
removed or repaired, all orifices should be fitted
with appropriate new blanking plugs to prevent
contamination entering.
WARNING
All pipes removed must be replaced.
10A-9
10A
When replacing a high pressure pipe, follow the
method below:
– remove the high pressure pipe, holding the filter rod
on the injector with a lock-wrench,
– insert anti-contamination plugs,
– loosen the high pressure rail,
– fit the new high pressure pipe,
– manually bring the unions together until they touch,
– tighten to torque:
● the high pressure rail mountings,
● the injector end union,
● the high pressure rail end union.
IMPORTANT
Dismantling the interior components of the
pump is prohibited.
The fuel return pipe fitted to the injectors must
be replaced when it is removed.
The diesel fuel temperature sensor cannot be
removed. It is part of the fuel return rail.
Loosening a high pressure pipe union when the
engine is running is prohibited.
ENGINE AND PERIPHERALS
Engine identification
ENGINE IDENTIFICATION
There are two means of identification.
A)
A plate (1) riveted onto the cylinder block.
10A-10
10A
ENGINE AND PERIPHERALS
Engine identification
A label (2) stuck onto the rocker cover.
A
B
E
F
G
H
engine type,
the engine approval letter,
The engine rating,
the engine fabrication number,
the engine assembly factory,
the assembled engine part number.
10A-11
10A
ENGINE AND PERIPHERALS
Engine identification
10A
Engine
Rating
Compression
ratio
Bore (mm)
Stroke (mm)
Cubic capacity
(cc)
G9T
700
701
702
703
710
712
720
722
742
743
750
18 / 1
87
92
2188
G9U
720
724
750
754
730
21.25 / 1
89
99
2463
10A-12
ENGINE AND PERIPHERALS
10A
Tightening torques (in daNm and/or in degrees)
UPPER ENGINE
Description
Tightening torque
Heater plugs
1.5
Injector flange bolt
*
Common rail mounting bolt
2.5
High pressure pipe nuts:
– on injectors
– on the pump and on the rail
2.5
2.7
Camshaft bearing cap bolts
*
Camshaft hub bolts
6
Camshaft sprocket bolts
0.9
Hydraulic rocker shaft bolts
*
Vacuum pump mounting bolts
2.3
Inlet tract bolt on cylinder head
*
Rocker cover bolt
*
Exhaust manifold nuts
2.7
Cylinder head plenum chamber bolts
1
Turbocharger flange nut
2.7
Turbocharger oil return bolt
0.8
Turbocharger oil supply hollow bolt on cylinder block
2.3
Turbocharger oil supply nut on turbocharger
2.3
Exhaust gas recirculation valve bolt on venturi
1.5
Exhaust heat shield bolt
1
Cylinder head support bolt
4.4
Air conditioning compressor bolts
2.1
Alternator bolts
3
* See tightening procedure.
10A-13
ENGINE AND PERIPHERALS
10A
Tightening torques (in daNm and/or in degrees)
UPPER ENGINE (continued)
Description
Tightening torque
Power assisted steering pump bolt
2.1
Power assisted steering pulley bolt
1
Accessories tension wheel bolt
2.1
Accessories pulley bolt
4.4
Engine lifting ring bolts
1
3
– M6
– M8
Timing belt cover bolt
1
Cylinder head mounting bolts
*
Timing tension wheel bolt
2.5
Timing pulley mounting bolt
3
* See tightening procedure.
RAIL PROTECTOR: Model 2
Protector bolts
(M6 bolt)
(M8 bolt)
1.2
2.5
(M6 bolt)
1
RAIL PROTECTOR: Model 1
Lower metal protector bolt
10A-14
ENGINE AND PERIPHERALS
10A
Tightening torques (in daNm and/or in degrees)
PERIPHERALS
Description
Tightening torque
Sump bolts
**
Crankshaft pulley bolts
5 plus angle of 90° ±6°
Flywheel bolts:
– Classic
– Dual mass flywheel
2 plus angle of 45° ±6°
2.5 plus angle of 50° ±6°
Clutch bolts
1.2
Oil pump bolts:
– M6
– M8
1
2.5
Anti-emulsion plate bolts
1
Bolts for split con rod caps
2.5 plus angle of 60° ±6°
Crankshaft bearing cap bolts
2 plus angle of 150° ±10°
Crankshaft bearing cap housing seam bolts
2
Water pump bolts
1
Water pump cover bolts
1
Water pump sprocket nut
5
Piston base cooling jet mounting bolts
2*
Timing cover bolt
1.2
3
– M6
– M8
Alternator bracket mounting bolt
3
High pressure pump mounting bolt
3
High pressure pump rear support bolt
3
High pressure pump sprocket nut
9
Cylinder marking sensor mounting bolt
1
Intermediate shaft mounting bolts
2.5 plus angle of 30° ±6°
Timing belt pulley bolt
3
Oil filter holder mounting bolt
2.2
Dipstick guide mounting bolt
Lower mounting
Upper mounting
Oil level sensor mounting bolt
1
TDC cap mounting bolt
**
*
2.5
1
3.1
See tightening order
Important: left-hand thread.
10A-15
ENGINE AND PERIPHERALS
10A
Tightening torques (in daNm and/or in degrees)
LOWER ENGINE (continued)
Description
Tightening torque
Coolant pipe bolts
3.1
Venturi mounting bolts
2.2
Catalytic converter mounting nuts
2.1
Catalytic converter stay mounting bolts
2.1
Relay bearing mounting bolts
6.2
Balance shaft cassette mounting bolts
1.5 plus an angle of 38° ±6°
10A-16
ENGINE AND PERIPHERALS
Specifications
CYLINDER HEAD
Cylinder head bolts must always be replaced.
WARNING
Do not oil new bolts. Bolts must be oiled if reused.
Cylinder head tightening procedure
WARNING
In order to ensure that the bolts are correctly tightened, use a syringe to
remove any oil which may be in the cylinder head mounting holes.
Tighten the cylinder head bolts to torque (3 daNm) and in order.
Check that all the bolts are correctly tightened to 3 daNm then angle
tightening (bolt by bolt) by 300°° ± 6°°.
WARNING
Do not retighten the cylinder head bolts after applying this procedure.
10A-17
10A
ENGINE AND PERIPHERALS
Specifications
Cylinder head changes
Model 1
This cylinder head has lower washers on the valve
springs.
Marking (1) is made directly on the newly cast cylinder
head.
Model 2
This cylinder head no longer has valve spring lower
washers.
Marking (1) is made after milling.
10A-18
10A
ENGINE AND PERIPHERALS
Specifications
10A
Cylinder head gasket thickness
There are two cylinder head gasket thicknesses:
Thickness of crushed gasket:
1.16 ± 0.05 mm
1.21 ± 0.05 mm
Cylinder head gasket thickness
The thickness of the cylinder head gasket is measured
at (1).
G9T engine
Cylinder head gasket thickness
1.16 ± 0.05 mm
10A-19
1.21 ± 0.05 mm
ENGINE AND PERIPHERALS
Specifications
Reset the dial gauge on the front of the cylinder block.
G9U engine
Cylinder head gasket thickness
10A
1.21 ± 0.05 mm
Apply force to the piston to eliminate the various
clearances (between pin and piston, between pin and
con rod, etc.)
Take the protrusion value at both points (1) and (2),
then take the average of the two measurements.
Note:
All measurements must be carried out along the
longitudinal engine axis, in order to eliminate any
errors due to tilting of the piston.
WARNING
The dial gauge feeler must not be in the valve
clearance.
Note:
When replacing:
– the crankshaft,
– the cylinder block,
– the con rods,
– the pistons.
The thickness of the cylinder head gasket must
be calculated.
Checking piston protrusion
Clean the piston crowns in order to eliminate any
scaling.
Turn crankshaft by one revolution (in the operating
direction, clockwise at the timing end) to bring piston
no. 1 close to the top dead centre.
Measure the piston protrusion.
The protrusion must be:
Put tool (Mot. 252-01) in position.
Insert tool (Mot. 251-01) equipped with a dial gauge on
its pressure plate (Mot. 252-01), and find top dead
centre of the piston.
10A-20
0.399 ± 0.065 mm.
ENGINE AND PERIPHERALS
Specifications
Cylinder head height (mm)
H = 90.2
10A
Hydraulic tappet
These engines are equipped with hydraulic thrust
bearings (1) and roller type rocker arms (2).
Gasket face deformation (mm)
Cylinder head
Cylinder block
0.05
0.06
Test the cylinder head to detect any cracks using
the cylinder head test tools, comprising a tray and a kit
suited to the cylinder head (cap, sealing plate,
blanking cover). The approval reference no. of the
cylinder head test tray is 664 000.
10A-21
ENGINE AND PERIPHERALS
Specifications
Valves
Valve seat
Stem diameter (in mm)
Seat angle ∝
Inlet:
Exhaust:
5.9675 ± 0.0125
5.9575 ± 0.0075
Inlet and exhaust:
10A
89°°30'
External diameter D (in mm)
Head diameter (in mm)
Inlet:
Exhaust:
Inlet:
Exhaust:
30.6 ± 0.12
29.5 ± 0.12
32.31 ± 0.01
31.11 ± 0.01
Mating face angle
Inlet and exhaust:
90°°15'
Valve length (in mm)
Inlet:
Exhaust:
123.2 ± 0.15
123 ± 0.15
Max valve lift (in mm)
Inlet:
Exhaust:
7.8
7.8
No valve clearance adjustment.
Diameter of housing in the cylinder head (in mm)
Inlet:
Exhaust:
10A-22
32.228 ± 0.0125
31.032 ± 0.0125
ENGINE AND PERIPHERALS
Specifications
10A
The valve stem seals must be fitted using tool
Mot. 1511-01 or other suitable equipment.
Valve guide
Length (in mm)
Inlet and exhaust:
50 ± 0.15
Guide external diameter (in mm)
Inlet and exhaust:
11
+ 0.039
+ 0.028
Diameter of guide housing in the cylinder head
(in mm)
Inlet and exhaust:
11
Guide internal diameter (in mm)
Inlet and exhaust:
Not machined:
5.5
Machined*:
6
+ 0.12
0
+ 0.022
0
* This value must be obtained with the guide fitted in
the cylinder head.
The inlet and exhaust guides have valve stem seals
which must be replaced each time the valves are
removed.
Note:
Do not lubricate the valve stem seals before fitting
them.
10A-23
ENGINE AND PERIPHERALS
Specifications
Angle of the inlet and exhaust guides (in degrees)
Inlet:
Exhaust:
95°°
10A
Position of inlet and exhaust valve guides (mm)
Inlet:
A = 8.7 ± 0.15
Exhaust:
A = 13.3 ± 0.15
94°°
Valve springs (mm)
10A-24
Free length:
46.7
Length under load
18.5 daN
21.5 daN
24.5 daN
35 daN
45 daN
48.3 daN
51.5 daN
40.5
39.5
38.5
35
32
31
30
Length of joined spires:
28
Wire diameter:
3.2 ± 0.02
Internal diameter:
14.1 ± 0.2
External diameter:
20.9
ENGINE AND PERIPHERALS
Specifications
10A
Camshaft
Longitudinal clearance (mm)
0.05 to 0.13
How to distinguish between camshafts:
– the exhaust camshaft has the vacuum pump
drive (1),
– the inlet camshaft has no vacuum pump drive.
Number of bearings:
6
Diameter of camshaft bearings (in mm)
on the camshafts:
25
on the cylinder head:
25
-0
- 0.021
+ 0.061
+ 0.040
Timing diagram
– Inlet opening retardation (ROA) *
– Inlet closing retardation (RFA)
– Exhaust opening advance (AOE)
– Exhaust closing advance (AFE)**
*
If the inlet opening retardation is negative, the
valves open after top dead centre.
**
If the exhaust closing advance is negative, the
valves close before top dead centre.
1
2
3
4
5
6
7
8
Cylinder block top dead centre fixed marking
Flywheel top dead centre moving mark
Flywheel bottom dead centre moving mark
Inlet Opening Retardation ROA
Exhaust Closing Advance AFE
Inlet Closing Retardation RFA
Exhaust Opening Advance AOE
Direction of engine rotation (flywheel end)
Either by a marking (2): marking details:
● (B) gives the engine type,
● (C) identifies the camshafts (A = Inlet and
E = Exhaust),
● (D) is used by the supplier only.
10A-25
- 11
16
28
- 13
ENGINE AND PERIPHERALS
Specifications
PISTONS
Table of gudgeon pin heights
Fitting the free floating pin in the con rod and in the
piston.
G9T
The gudgeon pin is retained by circlips.
10A
* Mark on
piston
Pin height H
(in mm)
Thickness of the
associated
cylinder head
gasket (in mm)
E
54.48
1.16
F
54.52
1.16
J
54.56
1.16
K
54.60
1.16
L
54.64
1.16
These engines are fitted with KOLBENSCHMIDT
pistons.
Piston marking
These pistons have no ducting (oil circulation in the
piston crown contributing to piston cooling).
1
2
3
4
5
6
7
Direction of fitting of the piston ("Λ" flywheel end)
Piston height category
Used by the supplier only
Used by the supplier only
Piston axis of symmetry
Gudgeon pin hole axis
Offset between axis (5) and axis (6). This offset is
0.5 mm
10A-26
* Mark on
piston
Pin height H
(in mm)
Thickness of the
associated
cylinder head
gasket (mm)
E
54.53
1.21
F
54.57
1.21
J
54.61
1.21
K
54.65
1.21
L
54.69
1.21
These pistons have no ducting (oil circulation in the
piston crown contributing to piston cooling).
ENGINE AND PERIPHERALS
Specifications
* Mark on
piston
Pin height H
(in mm)
Thickness of the
associated
cylinder head
gasket (mm)
A or T
54.53
1.21
B or U
54.57
1.21
C or W
54.61
1.21
D or X
54.65
1.21
G or Y
54.69
1.21
10A
G9U
* Mark on piston
Pin height H (in mm)
N
53.03
O
53.07
P
53.11
R
53.15
S
53.19
The tolerance on the pin heights is ± 0.02 mm.
These pistons have ducting (oil circulation in the piston
crown contributing to piston cooling).
Procedure for distinguishing between pistons with
an identical mark but different pin heights:
* The various gudgeon pin heights are exclusively
reserved for the engine assembly factory.
The Parts Department supplies only the following
piston categories
F
U
O
B
Calculation:X = H - 31/2
Example:
– piston of category F with a pin height H = 54.52
Hence X = 54.52 - (31 / 2)
X = 39.02 mm
– piston of category F with a pin height H = 54.57
Hence X = 54.57 - (31 / 2)
X = 39.07 mm
10A-27
and
and
and
and
K
X
R
D
ENGINE AND PERIPHERALS
Specifications
10A
Measuring the piston diameter
Fitting the rings
The piston diameter should be measured with
A = 49 mm for G9T engines,
A = 47 mm for G9U engines.
Rings are adjusted to their original fitting. They must
be free in their grooves.
Ensure the rings' direction of fitting is correct.
Piston diameter (in mm):
86.806 ± 0.007 for G9T engines,
88.81 ± 0.007 for G9U engines.
Gudgeon pin (in mm)
Length
External diameter
Internal diameter
64.7 to 65
30.994 to 31
15.13 ± 0.1
Rings
Three rings (thickness in mm)
Compression ring:
3
Sealing ring
1.75
Scraper ring
2.5
- 0.01
- 0.025
- 0.01
- 0.03
End clearance
Rings
End clearance (in mm)
Compression ring
0.2 to 0.35
Sealing ring
0.5 to 0.7
Scraper ring
0.25 to 0.5
10A-28
ENGINE AND PERIPHERALS
Specifications
CON RODS
The con rods are of the "SPLIT" type.
10A
Lateral clearance of the big end
(in mm)
0.22 to 0.482
Big end diametrical clearance
(in mm)
0.027 to 0.086
Big end - small end centre-to-centre distance:
There are four categories of big end - small end
centre-to-centre distance* (mm).
G9T
1
149.8775 ± 0.0075
2
149.8925 ± 0.0075
3
149.9075 ± 0.0075
4
149.9225 ± 0.0075
5
147.8775 ± 0.0075
6
147.8925 ± 0.0075
7
147.9075 ± 0.0075
8
147.9225 ± 0.0075
G9U
WARNING
– The bolts must be coated with engine oil under the
heads and on the threads when the con rods are
fitted on the engine.
– Positioning of the con rod caps on the body is
ensured by textured mating faces.
– Impacts or a foreign body between the body-cap
mating faces will cause a rapid fracture of the con
rod.
– It is vital that the mating faces remain clean and
dry.
– Do not oil the bearing shell pressure faces (cap
side and con rod side).
* Marking of the rotating assembly on the original
engine is reserved exclusively for the engine
assembly factory.
The Parts Department supplies only the following con
rod category:
3 for G9T engines
7 for G9U engines
Big end diameter (mm)
(there are two big end diameters)
51.587
56.587
+ 0.019
0
+ 0.019
0
Small end diameter (mm)
(without bush)
33.5
(with bush)
31
+ 0.025
0
+ 0.025
+ 0.013
Note:
The con rod small end bushes cannot be replaced.
10A-29
ENGINE AND PERIPHERALS
Specifications
WARNING
Do not use a sharp point to mark the big end caps in relation to their
bodies, to prevent incipient breakage of the con rod.
Use a permanent marker pen.
The maximum con rod weight difference for a given motor must be 25 grams.
10A-30
10A
ENGINE AND PERIPHERALS
Specifications
Direction of fitting of the con rod in relation to the
piston
10A
CRANKSHAFT
Number of bushings
5
Crankshaft lateral clearance (mm)
0.06 to 0.232
Crankshaft diametrical clearance (mm) 0.036 to 0.071
Diameter of bushings
The bushing diameters are shown on the crankshaft
by paint marks.
Position the "Λ" (1) etched on the piston crown
downwards and lubrication hole (2) on the small end to
the right of the vertical axis (as shown on the diagram
above). Also, the slot (3) should be positioned at the
flywheel end.
Direction of fitting circlips on the piston
Paint mark
Blue
Red
Bushing diameter
(mm)
57.98
inclusive to
57.99
exclusive
57.99
inclusive to
58 inclusive
Note:
This paint mark is used only by the factory for
matching bearing shells and bushings. The Parts
Department supplies only a single type of bearing
shell.
Crankpin diameter (mm)
48
53
- 0.01
- 0.03
- 0.01
- 0.03
The lateral shims are located on bearing no. 2.
NO REGRINDING IS AUTHORISED
The lateral shims have changed: A foolproofing device
has been added. They are not interchangeable. The
foolproofing device helps fitting the lateral shims:
Model 1 (1)
Model 2 (2)
Fit the circlips on the piston as shown above.
10A-31
ENGINE AND PERIPHERALS
Specifications
10A
BEARING SHELLS
Con rod bearing shells
Crankshaft bearing shells
These engines are fitted with non-foolproofed
bearing shells.
These engines are fitted with foolproofed bearing
shells.
The bearing shells are fitted using tools Mot. 1492 and
Mot. 1492-02 (with diameter 48 mm or 53 mm).
Direction of fitting:
– on the cylinder block, fit grooved bearing shells on
all the bearings,
– on the bearing caps, fit non-grooved bearing
shells.
Note:
On a given bearing, fit an upper bearing shell and a
lower bearing shell of the same colour.
The bearing caps and cylinder block bearings must be
clean and dry before the bearing shells are fitted.
10A-32
ENGINE AND PERIPHERALS
Specifications
Piston base cooling jet
WARNING
The piston base cooling jet mounting bolts have a
left-handed thread.
10A-33
10A
ENGINE AND PERIPHERALS
Specifications
PREPARING THE ENGINE TO BE MOUNTED ON THE SUPPORT
Before the engine is mounted on the support
(Mot. 792-03), the engine's electrical harness must be
removed and the engine oil drained.
Remove the exhaust heat shield.
Remove the turbocharger retaining strut from the
cylinder block (if fitted).
10A-34
10A
ENGINE AND PERIPHERALS
Specifications
Remove the turbocharger retaining strut and the pre-catalytic converter
retaining strut from the cylinder block (if fitted).
Remove the turbocharger oil supply pipe.
Remove the turbocharger oil return pipe.
Remove the three turbocharger mounting bolts (1).
10A-35
10A
ENGINE AND PERIPHERALS
Specifications
Remove:
– the exhaust manifold,
– driveshaft relay bearing.
10A-36
10A
ENGINE AND PERIPHERALS
Specifications
Note:
It is essential to remove the relay bearing centring dowel to enable stud D1
to be correctly positioned.
Position the rods (D), (D1) of tool Mot. 1574 and (T) of Mot. 1301 in the
cylinder block so that they fit into holes 19, 28 and 29 of the plate
(Mot. 792-03).
10A-37
10A
ENGINE AND PERIPHERALS
Specifications
10A
CONSUMABLES
Type
Quantity
Cleaner
-
Component concerned
Part no.
Cleaning parts
77 01 421 513
DECAPJOINT
Coat
Cleaning sealing surfaces
77 01 405 952
RHODORSEAL 5661
Coat
Crankshaft bearing cap housing
77 01 404 452
High pressure pump bolt
77 01 394 070
LOCTITE FRENETANCH
1 or 2 drops
WARNING
WARNING
The cleanliness rules described at the start of this document must be strictly observed when working on
the fuel supply system.
PARTS TO BE REPLACED AFTER REMOVAL:
–
–
–
–
–
–
–
–
–
–
–
–
–
all seals,
flywheel bolts,
crankshaft bearing bolts,
crankshaft pulley bolts,
con rod cap bolts,
injector holder copper washers,
diesel return pipes,
high pressure pipes,
pipe caps,
belts,
timing tension wheel,
timing pulley,
exhaust gas recirculation pipe.
WARNING
Excess sealant could be squeezed out when the parts are tightened; a mixture of sealant and fluid could damage
certain components (engine, radiator, etc.)
10A-38
ENGINE AND PERIPHERALS
Standard replacement
PREPARING USED ENGINE FOR RETURN
The engine must be cleaned and drained (oil and
water).
Leave on the used engine or include in the return box:
– the oil filter,
– the oil pressure switch,
– the water pump,
– the high pressure pump,
– the rail,
– the injectors
– the heater plugs,
– the diesel fuel collector on rail protector model 2,
– the oil level sensor,
– the cylinder head plenum chamber,
– the water pump coolant inlet pipe,
– the rocker cover,
– the dipstick,
– the vacuum pump,
– the flywheel,
– the clutch.
– the inlet shim assembly,
– the accessories support.
Remember to remove:
– all coolant flexible pipes,
– the exhaust manifold,
– the alternator,
– the power assisted steering pump,
– the air conditioning compressor,
– the rail protector model 1 (entire system),
– the cover of model 2.
The used engine must be secured to the base under
the same conditions as the overhauled engine:
– plastic caps and covers fitted,
– cardboard cover over the assembly.
10A-39
10A
ENGINE AND PERIPHERALS
Special tooling required
10A
Engineering
reference
Parts Department part
no.
Description
Mot. 11
00 01 072 500
Crankshaft spigot bush extractor
Mot. 251-01
00 00 025 101
Dial gauge support.
Used with tool Mot. 252-01
Mot. 252-01
00 00 025 201
Dial gauge support thrust plate.
Used with tool Mot. 251-01
Mot. 591-02
00 00 059 102
Magnetised flexible shaft for
angle wrench for tightening
cylinder head
Mot. 591-04
00 00 059 104
Angle wrench with index for
tightening cylinder head
(1/2" drive)
Mot. 792-03
00 00 079 203
Engine support plate for Desvil
engine stand (with studs A to W)
Mot. 1301
00 00 131 100
Stud ref. "T" for Desvil engine
stand Used with Mot. 792-03
Mot. 1313
00 00 131 300
Flywheel end crankshaft seal
fitting tool
10A-40
ENGINE AND PERIPHERALS
Special tooling required
10A
Engineering
reference
Parts Department part
no.
Mot. 1316
00 00 131 600
Flywheel locking tool
Mot. 1319
00 00 131 900
Depth gauge for measuring the
height of crankpins
Mot. 1335
00 00 133 500
Pliers for removing valve stem
seals
Mot. 1492
00 00 149 200
Tool for fitting con rod bearing
shells
Mot. 1492-02
00 00 149 202
Tool for fitting bearing shells on
split con rods - adaptor for
Mot. 1492 ∅ 48 mm and
∅ 53 mm
Mot. 1503
00 00 150 300
Tool for fitting high pressure
pump nut blanking cover
Mot. 1511-01
00 00 151 101
Tool for fitting valve stem seals
Mot. 1534
00 00 153 400
Inlet camshaft setting tool
10A-41
Description
ENGINE AND PERIPHERALS
Special tooling required
10A
Engineering
reference
Parts Department part
no.
Mot. 1536
00 00 153 600
Top dead centre locating pin
Mot. 1537
00 00 153 700
Exhaust camshaft setting tool
Mot. 1538
00 00 153 800
High pressure pump sprocket
immobiliser pin
Mot. 1539
00 00 153 900
Intermediate sprocket
immobiliser tool
Mot. 1540
00 00 154 000
Tool for aligning the play
compensation sprocket teeth
Mot. 1541
00 00 154 100
Tool for refitting the oil deflector
on the crankshaft sprocket
Mot. 1542
00 00 154 200
Tool for refitting the roll pins on
the intermediate sprocket shafts
Mot. 1548
00 00 154 800
High pressure pump sprocket
retaining and extraction tool
10A-42
Description
ENGINE AND PERIPHERALS
Special tooling required
10A
Engineering
reference
Parts Department part
no.
Mot. 1549
00 00 154 900
Injector extraction tool
Mot. 1560
00 00 156 000
Tool for fitting timing end
crankshaft seal
Mot. 1561
00 00 156 100
Tool for fitting intermediate shaft
seal
Mot. 1562
00 00 156 200
Tool for fitting camshaft seal
Mot. 1564
00 00 156 400
Flywheel end crankshaft seal
fitting tool
Mot. 1566
00 00 156 600
Tool for removing high pressure
pipes
Mot. 1573
00 00 157 300
Cylinder head support
Mot. 1574
00 00 157 400
Stud ref. "D1" for Desvil engine
stand Used with Mot. 792-03
10A-43
Description
ENGINE AND PERIPHERALS
Special tooling required
10A
Engineering
reference
Parts Department part
no.
Mot. 1577
00 00 157 700
Lip seal extractor ∅ 28 mm to
∅ 50 mm
Mot. 1578
00 00 157 800
Lip seal extractor ∅ 50 mm to
∅ 75 mm
Mot. 1579
00 00 157 900
Lip seal extractor ∅ 80 mm to
∅ 95 mm
Mot. 1628
00 00 162 800
Set of 3 sleeves for fitting
elastomer seals. This kit is
needed for tools Mot. 1560,
Mot. 1561 and Mot. 1562
Mot. 1660
00 00 166 000
Balance shaft setting tool
Mot. 1665
00 00 166 500
Flywheel timing pin
Emb. 1518
00 00 151 800
Set of clutch disc centring
mandrels
Emb. 1604
00 00 160 400
Clutch compression tool for
resetting the play compensation
system
10A-44
Description
ENGINE AND PERIPHERALS
Equipment required
10A
Description
Tool for fitting piston and rings into cylinder liner
Manual extractor for removing the water pump sprocket
Standard 22 mm long "1/2" (12.7 mm square) drive socket for removing the oil pressure
checking gauge
Valve spring compressor
Cylinder head test tools from CULASSE EUROPE SERVICE comprising, for example, a
tray and the various kits for each model of cylinder head (cap, sealing plate, blanking
cover).
The approval number of the cylinder head test tray is 664000
Female torx socket 8/12/14, standard 1/2 (12.7 mm square)
Angle tightening wrench
Tool for fitting valve stem seals
10A-45
ENGINE AND PERIPHERALS
Equipment required
Description
High pressure pipe wrench
Articulated wrench for removing and refitting heater plugs
Crankshaft spigot bush extractor pliers
Dummy heater plug for measuring the pressure at end of compression
"CROWFOOT" socket for tightening high pressure pipes to torque
10A-46
10A
ENGINE AND PERIPHERALS
Overhauling the engine
REMOVING THE UPPER ENGINE
Remove the accessories belt by turning the spanner to the left to slacken the
belt.
Lock the tension wheel by inserting a 4 mm Allen key in the hole (1).
10A-47
10A
ENGINE AND PERIPHERALS
Overhauling the engine
Remove the cylinder head suspended mounting.
10A-48
10A
ENGINE AND PERIPHERALS
Overhauling the engine
Remove:
– the timing cover,
– the TDC setting rod cap (1).
10A-49
10A
ENGINE AND PERIPHERALS
Overhauling the engine
10A
Fit the TDC setting rod (Mot. 1536).
ADJUSTING THE TIMING
Note:
The camshaft grooves must be vertical as shown in
the following illustration (zoom or top view).
Position the top dead centre mark (1) almost vertically
to the engine as shown in the following illustration.
10A-50
Turn the engine clockwise (timing end), while pressing
down on the TDC setting rod (Mot. 1536) until it
reaches the timing setting point.
ENGINE AND PERIPHERALS
Overhauling the engine
The inlet and exhaust camshafts are set using tools
Mot. 1534 and Mot. 1537.
10A
Place tools Mot. 1534 and Mot. 1537 in the camshaft
grooves as recommended below.
For the inlet camshaft:
Fit tool Mot. 1534 SCREWING IN THE BOLT (1) BY
HAND.
Loosen the three camshaft sprocket bolts (2) by up to
one turn.
Turn the inlet camshaft clockwise by the hub mounting
bolt (3) using a 16 mm tubular hexagon box spanner,
so as to pin the tool Mot. 1534 to the cylinder head.
Then lock down the bolt (1) onto tool (Mot. 1534).
10A-51
ENGINE AND PERIPHERALS
Overhauling the engine
For the exhaust camshaft:
Fit tool Mot. 1537 SCREWING IN THE BOLT (4) BY
HAND.
Loosen the three camshaft sprocket bolts (5) by up to
one turn.
Turn the inlet camshaft clockwise by the hub mounting
bolt (6) using a 16 mm tubular hexagon box spanner,
so as to pin tool Mot. 1537 to the cylinder head.
Then lock down the bolt (4) onto tool Mot. 1537.
10A-52
10A
ENGINE AND PERIPHERALS
Overhauling the engine
Slacken the timing belt by loosening the tension wheel
bolt (1).
Remove the three bolts (2), then remove the exhaust
camshaft sprocket.
Remove:
– the timing belt,
– the inlet camshaft sprocket,
– the camshaft hubs by removing the bolts (3).
10A-53
10A
ENGINE AND PERIPHERALS
Overhauling the engine
Remove:
– the strut linking the multifunction support to the
venturi unit,
– the power assisted steering pump rear bolt,
– the power assisted steering pump pulley.
10A-54
10A
ENGINE AND PERIPHERALS
Overhauling the engine
Remove:
– the power assisted steering pump,
– the accessories belt pulley,
– the accessories belt tension wheel,
10A-55
10A
ENGINE AND PERIPHERALS
Overhauling the engine
Remove the alternator.
10A-56
10A
ENGINE AND PERIPHERALS
Overhauling the engine
Remove the air conditioning compressor.
10A-57
10A
ENGINE AND PERIPHERALS
Overhauling the engine
10A
Unclip the rail protector from the rocker cover, pushing
it as far back as possible.
RAIL PROTECTOR
WARNING
Pay strict attention to the rules regarding
cleanliness (see start of document).
Remove the sealing partition (2) attached by two nuts
to the rocker cover, holding the stud in place (on some
versions).
Model 1
Unclip the rail protector side partitions (1).
Remove the absorbent soundproofing pads (3).
10A-58
ENGINE AND PERIPHERALS
Overhauling the engine
10A
Model 2
Remove the diesel fuel drain pipe (3).
Disconnect the oil vapour rebreathing pipe (1).
Remove the heater plugs using the correct equipment.
Unclip the protector plastic cover and remove it.
WARNING
When loosening the high pressure pipe nuts (7),
hold the filter-rod retaining nuts (8) with a lock
wrench.
10A-59
ENGINE AND PERIPHERALS
Overhauling the engine
Remove the injector pipes using tool Mot. 1566 or other suitable equipment.
Remove the high pressure pipe between the high pressure pump and the rail
(using a "CROWFOOT" socket).
WARNING
The clip (6) is very fragile.
10A-60
10A
ENGINE AND PERIPHERALS
Overhauling the engine
10A
Remove:
– the fuel return pipe (be sure to replace it),*
– the oil vapour recirculation pipe (Model 1).
Fit the anti-contamination blanking covers on the
high pressure pump, the injectors and the high
pressure pipes (set of caps available from the
Parts Department).
* To remove the return pipe, press on the clips then
pull the pipe out vertically. It is not necessary to
remove the clips. If removed, be sure to replace them.
Apply release agent around the injector.
WARNING
Never reuse injector holder mounting bolts. A
special set of studs is available from the Parts
Department.
REMOVING THE INJECTOR HOLDERS
Fit the extractor onto an injector holder.
Tighten the knurled ring to bring the two jaws together
on the flat surfaces without over-tightening.
Loosen the mounting bolts on each injector holder.
A special extractor must be used to remove the
injectors.
Never attempt to remove an injector holder locked
in its cylinder head well without using the tool
described below.
Description of the extractor (Mot. 1730 and 1549).
1 Extractor support chassis (1), which is mounted on
the rocker cover mounting bolts. Check that it is
positioned correctly before use.
2 Extractor (2).
3 Extractor bolt (3).
Mount the tool (Mot. 1549 and 1730) chassis on the
rocker cover mounting bolts. Tighten the extraction
bolt until the injector is released from the cylinder
head.
10A-61
ENGINE AND PERIPHERALS
Overhauling the engine
10A
RAIL PROTECTOR:
Model 1
Remove the washer from the bottom of each injector
well.
Remove:
– the bolt from the clamp (3) securing the rail to the
lower metal protector,
– the three common rail bolts (4), then remove the rail.
Remove:
– the two clips (2),
– the engine lifting eye at the flywheel end,
10A-62
ENGINE AND PERIPHERALS
Overhauling the engine
Remove:
– the side partition mounting bolt (5),
– the lower metal protector mounting bolt (6).
10A
Remove:
– the two aluminium protector mounting bolts,
– the rail protector.
Remove the rail protector with the side partition.
Model 2
Remove both injector rail mounting bolts, then remove
the rail.
Remove:
– the two aluminium protector mounting bolts,
– the rail protector.
10A-63
ENGINE AND PERIPHERALS
Overhauling the engine
Remove:
– the rocker cover bolts,
– the vacuum pump,
– the cylinder head plenum chamber.
10A-64
10A
ENGINE AND PERIPHERALS
Overhauling the engine
Remove the coolant pipe.
10A-65
10A
ENGINE AND PERIPHERALS
Overhauling the engine
Remove the rocker shafts.
10A-66
10A
ENGINE AND PERIPHERALS
Overhauling the engine
Mark the camshaft bearing caps.
Remove the camshaft bearing caps.
WARNING
Mark the position and direction of fitting of the
bearings.
10A-67
10A
ENGINE AND PERIPHERALS
Overhauling the engine
Remove:
– the camshafts,
– the exhaust gas recirculation pipe.
10A-68
10A
ENGINE AND PERIPHERALS
Overhauling the engine
Remove the cylinder head.
10A-69
10A
ENGINE AND PERIPHERALS
Overhauling the engine
DISMANTLING THE CYLINDER HEAD
Place the cylinder head on the cylinder head stand
(Mot. 1573).
Remove the inlet manifold.
Remove the cylinder head suspended mounting.
10A-70
10A
ENGINE AND PERIPHERALS
Overhauling the engine
Compress the valve springs using a valve-spring
compressor.
10A
Fit the pushrod (1) of Mot. 1511-01 on the valve stem
seal.
Remove the keys.
Note:
The internal diameter of the pushrod must be
identical to that of the valve.
Remove the springs' upper mounts.
Remove the springs.
Note:
Before removing the valves and the valve stem
seals, be sure to mark the position (H) of one of the
old seals in relation to the cylinder head using
Mot. 1511-01 or other suitable equipment.
10A-71
In addition, the bottom of the pushrod must be snug to
the metal upper section of the valve stem seal.
ENGINE AND PERIPHERALS
Overhauling the engine
10A
CLEANING
IMPORTANT
Do not scratch the aluminium sealing surfaces.
Wear goggles. Wear gloves during this operation.
Clean the sealing surfaces with DECAPJOINT
compound to dissolve any pieces of seal which are
still bonded.
Apply the product to the part to be cleaned, wait
around ten minutes, then remove residue using a
wooden spatula.
Do not allow this product to drip on to the paintwork.
Insert the guide tube (2) in the top of the pushrod, until
the guide tube comes into contact with the cylinder
head.
Lock the pushrod with the tumblewheel.
Take care during this operation to prevent foreign
bodies getting into the pressurised oil inlet pipes,
paying attention to the following:
– hydraulic thrust bearings,
– camshafts (pipes both on the cylinder block and
cylinder head).
– oil return pipes.
Failure to follow this advice could lead to the
blocking of the various oil inlet ducts, resulting in
rapid destruction of the engine.
CHECKING THE GASKET FACE
Remove the guide tube - pushrod assembly, being
careful not to loosen the tumblewheel.
Check for gasket face deformation using a ruler and a
set of shims.
Remove the valve guide seals using the pliers
(Mot. 1335).
Maximum distortion: 0.05 mm
Remove the spring lower mounts (if fitted, see section
"Cylinder head specifications").
10A-72
Test the cylinder head to detect any cracking using
the cylinder head test tools (comprising a tray and kit
for the cylinder head: cap, sealing plate and blanking
cover). The approval number of the cylinder head test
tray is 664 000.
ENGINE AND PERIPHERALS
Overhauling the engine
10A
CHECKING CAMSHAFT LONGITUDINAL
CLEARANCE
Tighten the camshaft bearing caps to a torque of
0.9 daNm.
Refit:
– the camshafts, ensuring they are correctly positioned
(see camshaft identification in the "Technical
specifications" section),
– the camshaft bearing caps (without tightening to
torque),
– the rocker shafts, without the rocker arms.
Fit a cylinder liner retaining bracket (Mot. 588) so it be
used as a support for the magnetic holder.
10A-73
Check the longitudinal clearance, which must be
between 0.05 and 0.13 mm inclusive.
Remove:
– the rocker shafts,
– the camshaft bearing caps,
– the camshafts.
ENGINE AND PERIPHERALS
Overhauling the engine
10A-74
10A
ENGINE AND PERIPHERALS
Overhauling the engine
REASSEMBLING THE CYLINDER HEAD
Fit new valves.
Gently grind them in on their respective seats. Clean
all the parts thoroughly, mark them for identification
purposes, then carry out the refitting operation.
Oil the inside of the valve guide.
Fit the lower valve spring mounts (if fitted, see section
"Cylinder head specifications").
Valve stems seals must be fitted using
Mot. 1511-01 or other suitable equipment.
Note:
Do not lubricate the valve stem seals before
fitting them.
Fitting new valve stem seals.
Place the valve in the cylinder head.
Fit the valve insert of Mot. 1511-01 on the valve stem
(the diameter of the insert must be the same as that of
the valve stem)
Keep the valve pressed against its seat.
Place the valve stem seal (not lubricated) over the
valve insert.
Push the valve stem seal past the insert, then
withdraw the insert.
10A-75
10A
ENGINE AND PERIPHERALS
Overhauling the engine
Mount the guide tube-pushrod assembly on the valve
stem seal.
10A-76
10A
ENGINE AND PERIPHERALS
Overhauling the engine
10A
Secure the cylinder head suspended mounting by
tightening the bolts to a torque of 4.5 daNm.
Push the valve stem seal down by tapping the top of
the sleeve with the palm of your hand until the guide
tube touches the cylinder head.
Repeat these operations for all the valves.
Fit:
– the springs,
– the upper mounts,
Compress the springs.
Secure the inlet manifold without locking the bolts.
Fit the keys.
10A-77
ENGINE AND PERIPHERALS
Overhauling the engine
REMOVING THE PERIPHERALS
Remove the timing gear cover.
Fit the flywheel immobiliser (Mot. 1316).
Remove:
– the timing belt pulleys and tension wheels,
– the water pump cover,
– the crankshaft accessories pulley.
10A-78
10A
ENGINE AND PERIPHERALS
Overhauling the engine
Remove the seal (1).
Remove:
– the high pressure pump sprocket nut (2),
– the number 2 intermediate shaft disc (3),
– the water pump nut (4).
10A-79
10A
ENGINE AND PERIPHERALS
Overhauling the engine
Remove the water pump sprocket using the extractor tool (U43L) for
example.
10A-80
10A
ENGINE AND PERIPHERALS
Overhauling the engine
Screw the pin (Mot. 1538) into the high pressure pump sprocket, to lock the
automatic play compensation system.
Fit the extractor (Mot. 1548) on the high pressure pump sprocket by tightening
the three bolts (5).
Then turn bolt (6) to remove the high pressure pump sprocket.
10A-81
10A
ENGINE AND PERIPHERALS
Overhauling the engine
Fit Mot. 1539 on intermediate sprocket number 1.
Bend the two tabs (7) against the sprocket and then
lock them.
Remove the mounting bolt (8) and then the sprocket.
10A-82
10A
ENGINE AND PERIPHERALS
Overhauling the engine
Remove:
– the crankshaft timing sprocket,
– intermediate sprocket number 1 pin and washer.
10A
Remove:
– intermediate sprocket number 2 pin,
– the water pump by removing both bolts (10).
WARNING
When replacing intermediate sprocket number 1 (on
its own) or intermediate sprocket number 2 (on its
own), be sure to replace both sprockets in the cases
listed below.
Engines concerned:
– G9T 710 up to the following engine number:
C 064517
– G9T 720 all engines are concerned
– G9T 722 up to the following engine number:
C 012789
– G9U 720 up to the following engine number:
C 012204
Remove intermediate sprocket number 2 by removing
the mounting bolt (9).
Remove the venturi unit by removing the three
bolts (11).
10A-83
ENGINE AND PERIPHERALS
Overhauling the engine
10A
Remove the high pressure pump by removing the
three bolts (13).
Remove the three bolts (12) or the two bolts (14) from
the high pressure pump rear support.
Remove the clutch mechanism and plate.
10A-84
ENGINE AND PERIPHERALS
Overhauling the engine
Remove the flywheel.
10A
Remove the inner timing cover bolts, then remove the
cover.
Remove the sump.
10A-85
ENGINE AND PERIPHERALS
Overhauling the engine
10A
Engine not equipped with balance shafts
Remove:
– the multifunction support,
– the oil level sensor,
– the oil filter holder.
Remove:
– the oil pump complete with its chain,
– the oil pump drive sprocket.
Remove the flywheel sensor.
10A-86
ENGINE AND PERIPHERALS
Overhauling the engine
10A
Remove the anti-emulsion plate:
With the engine set to top dead centre and tool
Mot. 1536 in position, set the balance shaft assembly
using a 4 mm Allen key (2).
Engine equipped with balance shafts
Remove the balance shaft assembly.
Gently turn the engine over to drain the oil still in the
cylinder block.
Remove the oil pump.
10A-87
ENGINE AND PERIPHERALS
Overhauling the engine
Remove the crankshaft bearing cap cover.
WARNING
Do not use a sharp point to mark the big end
caps in relation to their bodies, to prevent
incipient breakage of the con rod.
Use a permanent marker pen.
10A-88
10A
ENGINE AND PERIPHERALS
Overhauling the engine
Remove the con rod cap bolts and the connecting rod/
piston assemblies.
Remove the piston base cooling jets.
The bolts have a left-handed thread.
Be sure to mark the position of the crankshaft bearing
shells, as the category may be different on each
bearing.
Remove the crankshaft bearing shells.
10A-89
10A
ENGINE AND PERIPHERALS
Overhauling the engine
10A
FITTING THE CON ROD BEARING SHELLS
Remove the crankshaft spigot bush using tool Mot. 11
or an extractor.
The main bearing shells are fitted using tool Mot. 1492
and Mot. 1492-02 (with diameter 48 mm or 53 mm).
Clean:
– the stiffener baseplate,
– the cylinder block,
– the crankshaft.
Note:
When fitting the bearing shells, make sure that all the
parts are clean and dry.
EXTRACTING THE GUDGEON PINS
Note:
Be sure to mark the con rod to match it to its piston,
because the piston height categories on a given
engine may be different (see Technical
Specifications).
To extract the gudgeon pin, remove the circlip with a
screwdriver and withdraw the pin.
10A-90
ENGINE AND PERIPHERALS
Overhauling the engine
10A
Fit the body of the con rod on the base (as shown in
the diagram).
On the con rod body
Slide the bearing shell support (1) of tool Mot. 1492-02
(using the 48 mm or 53 mm diameter bearing shell)
into the groove (2) on the base of tool Mot. 1492.
Ensure that the lower section (4) of the small end is in
contact with the centring pin.
Fit the rail (3) of Mot. 1492-02 (using the 48 mm or
53 mm diameter rail) on the base (as shown in the
diagram).
Fit the bearing shell (5) on the bearing shell support,
then push it in the direction of the arrow (as shown in
the diagram).
10A-91
ENGINE AND PERIPHERALS
Overhauling the engine
Slide the bearing shell support to the end stop of the
con rod body.
Then remove the support from the con rod body and
repeat the operation for the other con rod bodies.
10A
On the con rod cap
Fit the con rod cap as shown in the diagram.
Note:
Do not cause impacts on the split con rod breakage
seams.
Push the rail (in the direction of the arrow) until the con
rod cap is resting on the pins (6) on the base.
10A-92
ENGINE AND PERIPHERALS
Overhauling the engine
Fit the shell (7) on the shell support, then push it in the
direction of the arrow (as shown in the diagram).
Slide the shell support to the end stop of the con rod
cap.
Remove the support from the con rod cap and repeat
the operation for the other con rod caps.
Note:
Do not cause impacts on the split con rod breakage
seams.
10A-93
10A
ENGINE AND PERIPHERALS
Overhauling the engine
REFITTING THE PERIPHERALS
Refit the piston base cooling jets, tightening them to a torque of 2 daNm.
The bolts have a left-handed thread.
10A-94
10A
ENGINE AND PERIPHERALS
Overhauling the engine
Refit the crankshaft bearing shells non-grooved on the crankshaft bearing
cap cover.
Refit the grooved crankshaft bearing shells on the cylinder block bearings,
checking that the lubrication holes in the bearing shells and the cylinder block
crankshaft bearings are correctly aligned.
Note:
The bearing shells must be fitted on clean, dry surfaces.
Apply a drop of oil on the crankshaft bearing shells.
10A-95
10A
ENGINE AND PERIPHERALS
Overhauling the engine
Refit the crankshaft lateral shims (1) on bearing No. 2 (grooves on
crankshaft side).
10A-96
10A
ENGINE AND PERIPHERALS
Overhauling the engine
Refit the crankshaft.
Refit the bearing cap casing by tightening the centre bolts in order to a torque
of 2 daNm, then angle tighten by 150°° ± 10°° (use the old centre bolts).
10A-97
10A
ENGINE AND PERIPHERALS
Overhauling the engine
Check the lateral clearance of the crankshaft, which
must be between 0.06 and 0.232 mm.
10A
Remove the crankshaft bearing cap cover.
The crankshaft bearing cap cover is sealed with a
bead of RHODORSEAL 5661 which must have a
width of 2 ± 0.4 mm and follow the line shown here.
WARNING
Excess sealant could be squeezed out when the
parts are tightened.
A mixture of sealant and fluid could damage certain
components (engine, radiator, etc.)
10A-98
ENGINE AND PERIPHERALS
Overhauling the engine
Do not forget to replace the centre crankshaft bearing cap cover bolts.
Refit the crankshaft bearing cap cover by tightening the centre bolts in order
to a torque of 2 daNm, then angle tighten by 150°° ± 10°°.
10A-99
10A
ENGINE AND PERIPHERALS
Overhauling the engine
Refit the outer bolts of the crankshaft bearing cap cover in order and to
torque (2 daNm).
Check that the crankshaft rotates freely.
10A-100
10A
ENGINE AND PERIPHERALS
Overhauling the engine
Replacing con rods or pistons
When replacing pistons or con rods, determine the
crankpin height "HM".
This will enable you to choose a piston matching the
con rod on sale from the Parts Department, or
matching the original con rods.
The crankpin height is measured using tool Mot. 1319
and tool Mot. 1319-01.
10A-101
10A
ENGINE AND PERIPHERALS
110A
Overhauling the engine
Measuring the crankpin height for cylinders 1
and 4:
– set the engine to top dead centre using Mot. 1536,
– fit Mot. 1319 in place of the "con rod -piston - bearing
shells" assembly (use the appropriate depth gauge Mot. 1319-01),
– calibrate the dial gauge (A) on the cylinder block,
taking the average of points C and E, then slide the
dial gauge to measure the protrusion (D) of rod (B).
Measuring the crankpin height for cylinders 2
and 3:
– set the crankpin to approximately top dead centre,
– fit Mot. 1319 (using the appropriate depth gauge Mot. 1319-01),
– calibrate the dial gauge (A) on the cylinder block,
taking the average of points C and E,
– place the dial gauge opposite the rod (B),
– turn the crankshaft to define the top dead centre of
the crankpin and, at the same time, note the rod
protrusion value (D).
Calculating crankpin height (HM)
HM = Length of B - Protrusion at D
Example (all dimensions are given in mm):
Length of rod B = 177.973 (value noted in the
Mot. 1319 and Mot. 1319-01 kit).
Cylinder
Protrusion (D)
HM
HM
HM
HM
1
2
3
4
0.500
0.487
0.493
0.530
= 177.973 - 0.500 = 177.473 for cylinder 1.
= 177.486 for cylinder 2.
= 177.480 for cylinder 3.
= 177.443 for cylinder 4.
Note:
The crankpin height must also be calculated when a
cylinder block or crankshaft is replaced.
To determine the piston category to be used, a formula
is available: A = D - E + 26.9735
A represents the gudgeon pin height in mm
D is the crankpin height measured in mm
E is the centre-to-centre distance between the big and
small ends in mm
10A-102
10A
ENGINE AND PERIPHERALS
Overhauling the engine
"CON RODS/PISTONS" ASSEMBLY
The pistons have a "Λ" mark etched on their crowns,
indicating the flywheel end.
Oil the gudgeon pin.
Check that the gudgeon pins rotate correctly in the
new piston and in the corresponding con rod.
Direction of fitting of the con rod in relation to the
piston
Position the "Λ" (1) etched on the piston crown
downwards and the small end lubrication hole (2) to
the right of the vertical axis (as shown in the diagram
below).
Moreover, the slot (3) must be at the flywheel end.
10A-103
10A
Note:
Put the gap in the gudgeon pin locking spring ring on
top, at ± 45° to the vertical axis of the piston.
ENGINE AND PERIPHERALS
Overhauling the engine
10A
Check that the big ends have the correct lateral
clearance of 0.22 mm to 0.482 mm.
FITTING THE RINGS
The rings must be free within their grooves and at their
original settings.
Ensure the rings are fitted the correct way round with
the word "TOP" pointing upwards.
Orientation of the rings in the piston
Ensure each ring's end clearance is correctly oriented
as shown in the diagram below.
Note:
Do not oil the ring grooves or the rings.
Check the piston protrusion, which must be
0.399 ± 0.065 mm.
Lightly oil the pistons and barrels.
Fit the "con rod/piston" assemblies into the cylinder
block using the ring, making sure they are fitted the
right way round (the "Λ" towards the flywheel).
Fit the con rods onto the oiled crankpins of the
crankshaft.
Fit the con rod caps, ensuring they are correctly
matched (marks made when dismantling).
Reset the dial gauge on the front of the cylinder block.
Tighten the con rod cap bolts to the required torque
(2.5 daNm), then angle tighten by 55°° ± 6°°.
Apply force to the piston to eliminate the various
clearances (between pin and piston, between pin and
con rod, etc.)
Take the protrusion value at both points (1) and (2),
then take the average of the two measurements (see
technical specifications).
10A-104
ENGINE AND PERIPHERALS
Overhauling the engine
REPLACING THE OIL PUMP DRIVE SPROCKET
OIL DEFLECTOR
10A
Fitting the flywheel end crankshaft seal
This engine can be fitted with two different types of
seal.
The oil deflector is fitted using tool Mot. 1541.
Arrange the parts as shown in the drawing, then
tighten the bolt (1) until it locks.
Old and new seals are easily recognised.
The old elastomer seal is fitted with a spring (2) and
has a V-shaped sealing lip (3).
Note:
Never oil the seal mating faces; the parts must be
clean and dry.
10A-105
ENGINE AND PERIPHERALS
Overhauling the engine
10A
For the new seals, follow the method described below.
The new elastomer seal has a flat sealing lip (4) and a
protector (5) which also fits the seal to the engine.
Fit tool Mot. 1564 on the crankshaft, securing it with
bolts (6).
For the old seals, use tool Mot. 1313.
Put the protector with the seal on tool Mot. 1564, being
careful not to touch the seal.
10A-106
ENGINE AND PERIPHERALS
Overhauling the engine
Mount the cover (7) and the nut (8) of tool Mot. 1564
(positioning the nut thread (9) towards the outside of
the engine).
Tighten the nut until the cover touches the cylinder
block.
10A-107
10A
Remove the nut, cover, protector and base of tool
Mot. 1564.
ENGINE AND PERIPHERALS
Overhauling the engine
Clean the crankshaft mounting bolt threads
10A
Install the flywheel immobiliser (Mot. 1316).
Degrease the bearing face of the flywheel on the
crankshaft.
Refit the flywheel, hand-tightening all the bolts.
Fit the TDC setting rod (Mot. 1536).
Turn the engine clockwise (timing end), while pressing
down on the TDC setting rod (Mot. 1536) until it
reaches the setting point.
Install the flywheel timing pin (Mot. 1665).
Tighten the bolts to a torque of:
– 2.5 daNm plus 50°° ± 6°° angle for the dual mass
flywheel,
– 2 daNm plus 45°° ± 6 ° angle for the classic
flywheel.
Remove:
– the flywheel timing pin (Mot. 1665),
– the flywheel immobiliser (Mot. 1316).
10A-108
ENGINE AND PERIPHERALS
Overhauling the engine
Refit the flywheel sensor.
Precautions to be taken when fitting the flywheel
sensor:
– position the clip and press at (1) to align the clip holes
with the boss holes.
– insert the sensor up to the stop on the flywheel target.
– the connector must be below the anti-rotation
bracket.
– release the clip.
Operations to be performed for fitting a sensor that has
already been used:
– file down the flange and insert a 1.15 mm shim
between the target and the sensor before releasing
the clip.
10A-109
10A
ENGINE AND PERIPHERALS
Overhauling the engine
10A
Special notes on engines equipped with balance
shafts:
Fit the TDC setting rod (Mot. 1536).
Turn the engine clockwise (timing end), while pressing
on the TDC setting rod (Mot. 1536) until it reaches the
timing setting point.
How to determine the crankshaft - balance shafts
backlash
Take the two 2.22 mm calibration shims from the kit,
clean them, and put them in position on the cylinder
block.
Clean the balance shaft assembly and cylinder block
support points.
Degrease and then blow-clean the gearing:
– at the crankshaft end (1),
– at the balance shafts end (2).
To tighten the bolts properly, use a syringe to remove
any oil found in the holes for mounting the balance
shaft assembly on the cylinder block.
Note:
The shim thickness is etched on them at (3).
10A-110
ENGINE AND PERIPHERALS
Overhauling the engine
Make sure the balance shaft assembly is properly set.
10A
Turn the shaft in the direction of the arrow until the
4 mm Allen key can be inserted in the flyweight
hole (4).
To do this, the hole position hole (4) in the balance
shaft assembly vertically.
Do not blow-clean the oil duct (5) to prevent any
contamination from entering.
10A-111
ENGINE AND PERIPHERALS
Overhauling the engine
Check that the crankshaft is set at top dead centre.
Refit the balance shaft assembly by tightening the old
bolts in order and to torque (1.5 daNm), then angle
tighten by 38°° ± 6°°.
10A
Fit the longitudinal clearance locking tool (Mot. 1660)
on the balance shaft assembly.
Fit the radial clearance locking tool (Mot. 1660) on the
balance shaft assembly after loosening the bolt (1).
Tighten bolt (1) until it locks, then loosen bolt (1) by
approximately 45°°.
10A-112
ENGINE AND PERIPHERALS
Overhauling the engine
10A
With a pencil, mark the starter ring gear teeth (one
mark every 13 teeth).
Place measuring tool (2) of the tool (Mot. 1660) on the
end of the drive shaft. Position tool (2) horizontally with
a set of shims (3), then immobilise the tool with a lock
bolt (4).
Fit the dial gauge on the measuring tool.
Remove the set of shims.
Remove the TDC setting rod (Mot. 1536).
WARNING
The drive shaft end can have one of two
diameters: 12 mm or 14 mm. To mount the
measuring tool on the end of the 14 mm shaft,
remove the tool socket (5).
10A-113
ENGINE AND PERIPHERALS
Overhauling the engine
10A
Determining the backlash
Move the lever (1) downward until the fixed pointer (2)
is aligned with the lower part (6) of the lever.
Pull lever (1) upward until the fixed pointer (2) is
aligned with the lower part (3) of the lever.
Then gently move lever (1) back upward until the fixed
pointer (2) is aligned with the mark (7) on the lever.
Then gently move the lever (1) back downward until
the fixed pointer (2) is aligned with mark (4) on the
lever.
Holding the lever in this position, reset the dial gauge
by pressing and holding the dial gauge button (5) for
around 1 second.
10A-114
ENGINE AND PERIPHERALS
Overhauling the engine
Read and note the value displayed on the dial gauge.
Repeat the above procedure several times to confirm
the reading.
Release the measuring tool.
10A
Position the measuring tool (Mot. 1660) horizontally
with a set of shims, then lock it.
Measure the backlash.
Repeat the above procedure for every 13 starter ring
teeth over a complete crankshaft rotation.
Turn the crankshaft in the operating direction by 13
teeth on the starter ring gear.
Take the smallest readings to select the correct shims
from the table below (for example, with a reading of
422 microns, use 2.06 mm thick shims).
Adjustment shim thickness based on backlash measured with the calibration shim
Dial gauge backlash reading (in µm)
10A-115
ENGINE AND PERIPHERALS
Overhauling the engine
10A
Remove the measuring tool (Mot. 1660).
Set the crankshaft at top dead centre with the rod
(Mot. 1536).
Set the balance shaft assembly with a 4 mm Allen key.
Remove the balance shaft assembly.
Remove the 2.22 mm calibration shims.
Clean the balance shaft assembly and cylinder block
support points.
Clean the shims.
To tighten the bolts properly, use a syringe to remove
any oil found in the holes for mounting the balance
shaft assembly on the cylinder block.
Make sure the crankshaft and balance shaft assembly
are set.
Refit the selected shims.
Refit the balance shaft assembly by tightening the new
bolts in order to torque (1.5 daNm), then angle tighten
by 38°° ± 6°°.
Remove the locking tools (Mot. 1660) , the TDC setting
rod (Mot. 1536), and the 4 mm Allen key.
Refit the anti-emulsion plate, tightening the bolts to a
torque of 1 daNm.
10A-116
ENGINE AND PERIPHERALS
Overhauling the engine
Refit the oil pump by tightening the M6 bolts to a
torque of 1 daNm, and the M8 bolt to a torque of
2.5 daNm.
10A-117
10A
ENGINE AND PERIPHERALS
Overhauling the engine
Special notes concerning engines not equipped with balance shafts
10A-118
10A
ENGINE AND PERIPHERALS
Overhauling the engine
Refit:
– the anti-emulsion plate without locking the bolts,
– the oil pump drive chain and sprocket.
Tighten the oil pump bolts in order and to torque (2.5 daNm).
Tighten the anti-emulsion plate bolts in order and to torque (1 daNm).
10A-119
10A
ENGINE AND PERIPHERALS
Overhauling the engine
10A
ALL TYPES
Clean the inner timing cover.
Put all the bolts in position and then tighten in
accordance with the table below.
Check that the oil supply pipes (1) and (2) are not
clogged.
Fit the seal between the cylinder block and the inner
timing cover.
– bolts 19, 20, 21 are M6*100-20 bolts,
– bolts 1 and 2 are M8*125-20 bolts,
– the other bolts are M6*100-30 bolts.
10A-120
Assembly
Bolt tightening
order
Tightening
torque
(in daNm)
Operation
No. 1
7 - 18 - 5 - 14 - 10 3 - 16 - 20 - 12
1 (pretightening)
Operation
No. 2
1-2
3
Operation
No. 3
3- 4- 5- 6- 7- 89 - 10 - 11 - 12 - 13
- 14 - 15 - 16 - 17 18 - 19 - 20 - 21
1.2
ENGINE AND PERIPHERALS
Overhauling the engine
WARNING
Excess sealant could be squeezed out when the
parts are tightened. A mixture of sealant and fluid
could damage certain components (engine,
radiator, etc.)
10A
Refit the multifunction support by securing it against
both the cylinder block and on the inner timing cover.
Tighten the bolts in order and to torque (3 daNm).
Refit:
– the oil level sensor to a torque of 1 daNm
– the oil filter support equipped with a new seal and a
new filter element.
Tighten only the two bolts (7) to torque (2.5 daNm).
Apply some RHODORSEAL 5661 at points (3).
Refit the oil sump equipped with a new seal.
Pre-tighten the bolts in order and to a torque of
0.5 daNm, then perform the final tightening to torque
(0.9 daNm).
10A-121
ENGINE AND PERIPHERALS
Overhauling the engine
Refit the high pressure pump, applying one or two
drops of LOCTITE FRENETANCH, then tighten the
bolts to a torque of 3 daNm.
10A
Model 2
Refit the venturi unit, tightening the bolts to a torque of
2.5 daNm.
Refit the high pressure pump rear support, tightening
the bolts to a torque of 3 daNm.
Model 1
10A-122
ENGINE AND PERIPHERALS
Overhauling the engine
10A
FITTING THE INTERMEDIATE SHAFT ROLL PINS
Roll pins are fitted using tool Mot. 1542.
Intermediate shaft No. 1
Offer up the intermediate shaft as shown in the
diagram.
The roll pin housing (2) must be facing upward and the
shaft groove (3) must fit onto the lug on the base.
Insert the roll pin into the hole (4) in the base.
Position the base (1) of tool Mot. 1542 in the vice.
10A-123
ENGINE AND PERIPHERALS
Overhauling the engine
10A
Tap the roll pin punch with a hammer until the punch
comes into contact with the base.
Offer up the intermediate shaft as shown in the
diagram.
The roll pin housing (6) should be facing upward and
the shaft groove (7) should fit onto the lug on the base.
Insert the roll pin into the hole (8) in the base.
Intermediate shaft No. 2
Position the base (5) of tool Mot. 1542 in the vice.
10A-124
ENGINE AND PERIPHERALS
Overhauling the engine
10A
Tap the roll pin punch with a hammer until the punch
comes into contact with the base.
Lubricate the bores and the intermediate shafts with
engine oil.
Refit intermediate shaft No. 1 (9), positioning the roll
pin in the groove (10).
Refit intermediate shaft No. 2 (11), positioning the roll
pin in the groove (12).
Refit the bearing washers (13).
Refit the water pump (fitted with a seal) by pressing
down on the bosses (14) to properly secure the pump
against the inner timing cover.
Tighten the bolts (15) to torque (1 daNm).
10A-125
ENGINE AND PERIPHERALS
Overhauling the engine
10A
REPLACING THE PLAY COMPENSATION
SPROCKETS
Note:
Special tooling is required for this operation.
For replacing intermediate sprocket No. 1 and the high
pressure pump sprocket use tool Mot. 1540.
Method for replacing intermediate sprocket No. 1:
Remove the two brackets from tool Mot. 1539.
Fit intermediate sprocket No. 1 on the locator (9).
Tighten the bolt with its washer (10), to prevent the
sprocket slipping off the locator.
Push the toothed segment (11) in the direction of the
arrow to immobilise the sprocket, then lock it with the
wing nut (12).
Place tool Mot. 1540 in a vice, then adjust the levers
(1) and (2) as shown below:
– for lever (1), insert the pin (3) in the groove (4), then
tighten the wing nut (5),
– for lever (2), insert the pin (6) in the groove (7), then
tighten the wing nut (8).
10A-126
Remove tool Mot. 1539, holding the levers (2) and
then (1) in turn to facilitate removal of the tool and to
prevent the gear tooth automatic compensation from
relaxing suddenly.
Remove intermediate sprocket No. 1.
ENGINE AND PERIPHERALS
Overhauling the engine
10A
Refit the new intermediate sprocket No. 1, locking it by
means of the bolt (10) and the toothed segment (11).
Turn the lever (2) in the direction of the arrow to align
the teeth of the hub with those of the lower flange.
Check that the locating pins (3) and (6) are in the
middle of the grooves (4) and (7) on levers (1) and (2).
Press on the tool (Mot. 1539) until the tool stops
against the upper flange.
Remove intermediate sprocket No. 1 from Mot. 1540
Refit the retaining brackets on tool Mot. 1539.
Turn the lever (1) in the direction of the arrow to align
the teeth of the upper flange with those of the hub.
Mount tool Mot. 1539 down as far as the teeth of the
lower flange.
10A-127
ENGINE AND PERIPHERALS
Overhauling the engine
10A
Method for replacing the high pressure pump
sprocket.
Adjust lever (1) so that the locating pin (3) is in groove
(13), then tighten the wing nut (5).
Fit the high pressure pump sprocket on the locator,
then tighten bolt (10) with its washer, to prevent the
sprocket slipping off from the locator.
Push the toothed segment (11) in the direction of the
arrow to immobilise the sprocket, then lock the toothed
segment with the wing nut (12).
Remove tool Mot. 1538, holding the lever (1) to
facilitate removal of the tool and to prevent the gear
tooth automatic compensation from relaxing suddenly.
Refit the new high pressure pump sprocket, locking it
with bolt (10) and the toothed segment (11).
Check that the locating pin (3) is in the middle of the
groove (4) on the lever (1).
10A-128
ENGINE AND PERIPHERALS
Overhauling the engine
10A
Set the crankshaft to top dead centre using tool
Mot. 1536.
WARNING
When replacing intermediate sprocket number 1 (on
its own) or intermediate sprocket number 2 (on its
own), be sure to replace both sprockets in the cases
listed below.
Engines concerned:
– G9T 710 up to the following engine number:
C 064517
– G9T 720 all engines are concerned
– G9T 722 up to the following engine number:
C 012789
– G9U 720 up to the following engine number:
C 012204
Refit the crankshaft sprocket (1); the key (2) must be
located towards the top in the vertical axis of the
engine.
Turn the lever (1) in the direction of the arrow to align
the teeth of the upper flange with those of the hub.
Screw tool Mot. 1538 until it locks.
Remove the high pressure pump sprocket from tool
Mot. 1540.
10A-129
Refit intermediate sprocket No. 2 without tightening
the bolt (3).
ENGINE AND PERIPHERALS
Overhauling the engine
Refit intermediate sprocket No. 1, tightening the bolt
(4) to torque (2.5 daNm) plus an angle of 30°° ± 6°°,
then remove tool Mot. 1539
10A
Refit the high pressure pump sprocket nut, tightening it
to a torque of 9 daNm.
Refit the water pump sprocket, tightening the nut to a
torque of 4 daNm.
Refit the flywheel immobiliser (Mot. 1316), making
sure that the key (2) of the crankshaft sprocket is at
the top and in the vertical axis of the engine.
Then remove the TDC setting rod (Mot. 1536).
Refit the high pressure pump sprocket, aligning marks
(5) and (6).
10A-130
Refit the timing gear housing seal, after degreasing the
sealing surfaces.
ENGINE AND PERIPHERALS
Overhauling the engine
Refit the timing gear housing cover, so that all the bolts
are in contact with the cover.
10A
FITTING THE INTERMEDIATE SHAFT NO.2 SEAL
AND TIMING END CRANKSHAFT SEAL.
This engine can be fitted with two different types of
seal.
Tighten to torque in the following order:
● the M6 bolts: 10, 4, 8, 7, 12 and 2 (0.8 daNm),
● the M8 bolts: 13, 14 and 15 (2.5 daNm),
● the M6 bolts: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 and 12
(1.1 daNm).
Old and new seals are easily recognised.
The old elastomer seal is fitted with a spring (2) and
has a V-shaped sealing lip (3).
Note:
Never oil the seal mating faces; the parts must be
clean and dry.
10A-131
ENGINE AND PERIPHERALS
Overhauling the engine
The new elastomer seal has a flat sealing lip (4) and a
protector (5) which also fits the seal to the engine.
Fitting the seal on intermediate shaft No. 2:
Remove bolt (6).
10A-132
10A
Screw the threaded rod (7) of tool Mot. 1561 into
intermediate shaft No. 2.
ENGINE AND PERIPHERALS
Overhauling the engine
For the new seal, put the protector with the seal on the
intermediate shaft, taking care not to touch the seal.
For the old seal, place the protector marked B of tool
(Mot. 1628) fitted with the seal on the intermediate
shaft.
Note:
Never oil before fitting; the parts must stay clean and
dry.
10A-133
10A
Mount the cover (8) and the nut (9) of tool Mot. 1561
(positioning the threaded part (10) of the nut towards
the outside of the engine).
ENGINE AND PERIPHERALS
Overhauling the engine
Screw on the nut until the cover makes contact with
the timing gear cover.
10A
Remove the nut, the cover, the protector and the
threaded rod.
Refit the intermediate shaft bolt, tightening it to a
torque of 2.5 daNm plus an angle of 30°° ± 6°°.
10A-134
ENGINE AND PERIPHERALS
Overhauling the engine
10A
Fitting the timing end crankshaft seal
For the old seal, place the protector marked C of tool
Mot. 1628 fitted with the seal on the crankshaft.
Screw the threaded rod (11) of tool Mot. 1560 into the
crankshaft.
For the new seal, put the protector with the seal on the
crankshaft, taking care not to touch the seal.
In addition, position the groove (12) of the protector
opposite the key on the crankshaft sprocket (13).
10A-135
Note:
Never oil before fitting; the parts must stay clean and
dry.
ENGINE AND PERIPHERALS
Overhauling the engine
Mount the cover (14) and the nut (15) of tool Mot. 1560
(positioning the threaded part (16) of the nut towards
the outside of the engine).
Screw on the nut until the cover makes contact with
the timing cover.
10A-136
10A
Remove the nut, the cover, the protector and the
threaded rod.
ENGINE AND PERIPHERALS
Overhauling the engine
10A
Refit the cap on intermediate shaft No. 2 using tool
Mot. 1488.
Note:
Never oil before fitting; the parts must stay clean and
dry.
Refit the water pump cover fitted with the new seal,
tightening the bolts to a torque of 1 daNm.
Refit the timing pulley, tightening the bolt to a torque of
3 daNm.
Refit the crankshaft accessories pulley, tightening the
bolt to a torque of 5 daNm plus an angle of 90°° ± 6°°.
Fit the tension wheel again without locking the bolt,
ensuring the roll pin (1) is correctly positioned in the
groove (2).
Remove the flywheel immobiliser (Mot. 1316).
10A-137
ENGINE AND PERIPHERALS
Overhauling the engine
To fit the cap on the high pressure pump, make a flat
area of X = 17 mm and Y = 40 mm on tool Mot. 1503.
10A
REFITTING THE UPPER ENGINE
Assessing the rocker shafts.
WARNING
Do not reverse the rocker shaft spacers.
10A-138
ENGINE AND PERIPHERALS
Overhauling the engine
10A
INLET ROCKER SHAFT
EXHAUST ROCKER SHAFT
Check that the lubrication holes in the rocker shaft, the
rocker arms and the bearings are not blocked. To
ensure the rocker shaft is correctly fitted, position the
flat part (1) as shown in the diagram and then slide the
rocker arms onto the shaft so that the lubrication holes
(2) on the shaft coincide with those on the arms.
Check that the lubrication holes in the rocker shaft, the
rocker arms and the bearings are not blocked. To
ensure that the rocker shaft is correctly fitted, position
the flat part (6) as shown in the diagram and then slide
the rocker arms onto the shaft so that the lubrication
holes (7) on the shaft coincide with those on the arms.
Mount:
– the spacer (3),
– the clip (4),
– the bolt (5).
Fit:
– the spacer (8),
– the clip (9),
– the bolt (10).
Carry out the above operations for the other rocker
arms.
Carry out the above operations for the other rocker
arms.
Fit the cylinder head gasket (with the markings facing
upwards).
Mount the cylinder head.
Tighten the cylinder head (see Cylinder head
specifications).
10A-139
ENGINE AND PERIPHERALS
Overhauling the engine
Apply some oil to the camshaft bearings on the
cylinder head side.
Refit the camshafts, positioning them correctly (see
"Camshaft identification" in the Technical
specifications section).
Apply a drop of oil on each bearing.
Note:
The sealing surfaces must be clean, dry and free
from grease (avoid finger marks).
Put a bead of LOCTITE 518 2 mm wide on:
– bearing cap number 6, inlet camshaft (1),
– bearing caps numbers 1 and 6, exhaust
camshaft (2).
10A-140
10A
ENGINE AND PERIPHERALS
Overhauling the engine
Refit:
– the camshaft bearing caps (in accordance with the
marks made previously), tightening to a torque of
1.2 daNm only:
– the bolts (4) of inlet camshaft bearings 1 and 6,
– the bolts (5) of exhaust camshaft bearings 1
and 6,
– the rocker shafts, positioning them as follows:
– for the exhaust camshaft, put the end of the rocker
shaft with the flat part (7) at the timing end,
– for the inlet camshaft, put the end of the rocker
shaft without the flat part (8) at the timing end.
10A-141
10A
ENGINE AND PERIPHERALS
Overhauling the engine
In order to tighten the rocker shaft correctly, you must start with:
– the inlet rocker shaft bolts, then those of the exhaust, tightening them in
order and to torque (1.3 daNm).
– the inlet camshaft bearing cap bolts, then those of the exhaust, tightening
them in order and to torque (1 daNm).
10A-142
10A
ENGINE AND PERIPHERALS
Overhauling the engine
10A-143
10A
ENGINE AND PERIPHERALS
Overhauling the engine
Refit:
– the new exhaust gas recirculation pipe with new
seals, and tighten the bolts to a torque of 2.5 daNm,
– the coolant pipe fitted with new seals (to be tightened
to torque later),
10A-144
10A
– the thermostat unit fitted with new seals, tightening
the bolts to a torque of 1 daNm,
– the vacuum pump fitted with a new seal, tightening
the bolts to a torque of 2.3 daNm,
– the coolant pipe bolt, tightening to a torque of
3 daNm.
ENGINE AND PERIPHERALS
Overhauling the engine
10A
Flywheel end.
WARNING
Excess sealant could be squeezed out when the
parts are tightened.
A mixture of sealant and fluid could to certain
components (engine, radiator, etc.)
Apply some RHODORSEAL 5661 to the corners of the
camshaft bearing caps and in the half-shell.
Timing end
Fit all the new seals on the rocker cover.
10A-145
ENGINE AND PERIPHERALS
Overhauling the engine
Note:
Apply a drop of FRENETANCH LOCTITE on bolts 1-2-3-4-5-6-7-13.
Refit the rocker cover, tightening the bolts in order and to torque (1.2 daNm).
10A-146
10A
ENGINE AND PERIPHERALS
Overhauling the engine
Tighten the inlet manifold bolts in order and to torque
(1.2 daNm).
10A
Refit:
– the flywheel end engine lifting eye
– the clips on the venturi unit sleeve.
Note:
Check that the turbulence flap is operating correctly.
Check that there is no hard point.
Use a vacuum pump.
Note:
The sleeve bearing surfaces must be clean and dry.
10A-147
ENGINE AND PERIPHERALS
Overhauling the engine
Refit the heater plugs, tightening them to a torque of
1.5 daNm.
10A
Fit a new washer on each injector nozzle.
Fit the injector with its bracket and locking spring ring.
Do not remove the protective caps from each
component until the last moment.
Oil the threads of the nuts.
Clean the injector sockets and the injector bodies as
well as their brackets using a lint-free cloth (use the
wipes recommended for this purpose, part no.
77 11 211 207) soaked in fresh solvent.
Dry off using a new cloth.
Clean one of the old injector mounting bolts and screw
it down to the end of the mounting hole to clean out the
threading.
WARNING
Before mounting the stud on the cylinder head,
make sure the nut (3) screws smoothly onto the stud
(1); if not, replace both.
WARNING
Tighten the nut (4) on the timing end first, then the
nut (5) on the flywheel end.
Tighten nut (4) to torque (0.6 daNm), then tighten nut
(5) to torque (0.6 daNm) (starting with the timing
end and finishing at the flywheel end).
Angle tighten nut (5) only by 360°° ± 30°° (flywheel end
nut).
Fit the new studs (1) and injector mounting spacers (2)
after coating the threads with oil and screw them in as
far as possible by hand (0.2 daNm). Always replace
the studs and nuts after every removal.
10A-148
ENGINE AND PERIPHERALS
Overhauling the engine
10A
RAIL PROTECTOR
WARNING
The cleanliness rules must be strictly observed (see
start of document).
Model 1
Refit the "rubber flap/lower metal protector" assembly
to the engine by refitting the lower metal protector
mounting bolt (3).
Refit the rubber flap to the lower metal protector by
pulling on the five rubber wall staples (4). Check that
the wall staples are clipped on correctly.
WARNING
Excess sealant could be squeezed out when the
parts are tightened.
A mixture of sealant and fluid could damage certain
components (engine, radiator, etc.)
Refit the injector rail with its partition (5) without
locking the rail mounting bolts.
Apply a bead of RHODORSEAL 5661 on the cylinder
head at the point indicated by a black line in the
diagram.
10A-149
ENGINE AND PERIPHERALS
Overhauling the engine
Remove the caps from the rail, the injector holders, the
pump and the injection pipes.
10A
Refit:
– the fuel return pipe*,
– the oil vapour recirculation pipe.
Fit the injection pipes between:
– the rail and the injectors,
– the rail and the pump.
Pre-tighten the high pressure pipe nuts by hand.
* To refit the return pipe, press on the clips and mount
the pipe onto the injector head. Release the clip.
Tighten to a torque of:
– 2.5 daNm the rail mounting bolts,
– 2.5 daNm the injection pipe nuts at the injector end
– 2.7 daNm the injection pipe nuts at the rail and high
pressure pump end.
Clip on the pump/rail pipe retaining clip and tighten the
two mounting bolts.
10A-150
ENGINE AND PERIPHERALS
Overhauling the engine
10A
Refit the aluminium protector, finger tightening both
mounting bolts.
Model 2
WARNING
Excess sealant could be squeezed out when the
parts are tightened. A mixture of sealant and fluid
could damage certain components (engine,
radiator, etc.)
Tighten bolt (1) to torque (0.4 daNm).
Clean the RHODORSEAL 5651 between the rocker
cover and the protector.
Refit the injector rail by finger tightening the two
mounting bolts.
Remove the caps from the rail, the injector holders and
the injection pipes.
Apply RHODORSEAL 5661 to the rocker cover at the
point marked on the diagram.
Fit the injection pipes between the rail and the
injectors, and pretighten by hand until they touch.
Tighten to torque in the following order:
– the injection pipe unions on the rail (2.2 daNm
pretightening),
– the aluminium protector mounting bolt (1)
(2.5 ± 0.5 daNm),
– the two rail mounting bolts (2.5 ± 0.5 daNm),
– the injection pipe unions on the injectors
(2.5 ± 0.7 daNm),
– the injection pipe unions on the rail (2.7 ± 0.8 daNm).
10A-151
ENGINE AND PERIPHERALS
Overhauling the engine
10A
Fit the injection pipe between pump and rail, and
pretighten by hand until they touch.
Refit the diesel drain pipe, checking that it is not
capped.
Clip on the pump-rail pipe (2).
This pipe must be replaced if it has been in contact
with diesel fuel.
Finger tighten the pump-rail injection pipe bracket bolt.
Tighten to torque:
– the pump-rail injection pipe unions (2.7 ± 0.8 daNm),
– the pump-rail pipe bracket bolt (0.3 daNm).
– the rail protector bolt (3).
Fit the sleeves on the injection pipes.
10A-152
Refit the soundproofing pads, replacing them if they
are damaged or soaked with diesel fuel.
Refit a new diesel return pipe, ensuring that the
mounting clips are properly fitted to the injectors and
rail.
ENGINE AND PERIPHERALS
Overhauling the engine
10A
FITTING THE CAMSHAFT SEALS
This engine can be fitted with two different types of
seal.
Old and new seals are easily recognised.
The new elastomer seal has a flat sealing lip (4) and a
protector (5) which also fits the seal to the engine.
The old elastomer seal is fitted with a spring (2) and
has a V-shaped sealing lip (3).
Note:
Never oil the mating faces of the seal before fitting.
The surfaces must remain clean and dry.
10A-153
ENGINE AND PERIPHERALS
Overhauling the engine
10A
Screw the threaded rod (6) of tool Mot. 1562 into the
camshaft.
For the old seal, place on the camshaft the protector
marked A of tool Mot. 1628 fitted with the seal.
For the new seal, put the protector with the seal on the
camshaft, taking care not to touch the seal.
Fit the cover (7) and the collar nut (8) of tool
Mot. 1562.
10A-154
ENGINE AND PERIPHERALS
Overhauling the engine
Screw on the collar nut until the cover touches the
cylinder head.
10A
Remove the nut, the cover, the protector and the
threaded rod.
10A-155
ENGINE AND PERIPHERALS
Overhauling the engine
Refit the camshaft hubs with the timing sprockets
fitted.
Position the camshaft grooves vertically as shown in
the following diagram (top view zoom).
10A-156
10A
ENGINE AND PERIPHERALS
Overhauling the engine
Position tools Mot. 1534 and Mot. 1537 in the
camshaft grooves following the instructions below.
10A
For the exhaust camshaft:
Note:
Tools Mot. 1534 and Mot. 1537 must not be
subjected to a force greater than the recommended
torque on the hubs, or they could be destroyed.
For the inlet camshaft:
Fit tool Mot. 1537, screwing in the bolt (4) by hand.
Turn the exhaust camshaft clockwise by the hub
mounting bolt (6) (using a 16 mm tubular hexagon box
spanner) in order to secure tool Mot. 1537 against the
cylinder head, then lock the Mot. 1537 bolt (4).
Fit tool Mot. 1534, screwing in the bolt (1) by hand.
Turn the inlet camshaft clockwise by the hub mounting
bolt (3) (using a 16 mm tubular hexagon box spanner)
in order to secure tool Mot. 1534 against the cylinder
head, then lock the Mot. 1534 bolt (1).
10A-157
Tighten the camshaft hub bolts (3) and (6) to torque
(6 daNm).
ENGINE AND PERIPHERALS
Overhauling the engine
Refit the air conditioning compressor, tightening the bolts to torque
(2.1 daNm)
10A-158
10A
ENGINE AND PERIPHERALS
Overhauling the engine
Refit the alternator, tightening the bolts to torque (2.1 daNm).
10A-159
10A
ENGINE AND PERIPHERALS
Overhauling the engine
Refit the power assisted steering pump, tightening the bolts to torque
(2.1 daNm).
Refit the accessories belt pulley, tightening the bolt to torque (4.5 daNm).
Refit the accessories belt tension wheel, tightening the bolts to torque
(2.1 daNm).
10A-160
10A
ENGINE AND PERIPHERALS
Overhauling the engine
Refit the power assisted steering pump pulley, tightening the bolts to torque
(1 daNm).
10A-161
10A
ENGINE AND PERIPHERALS
Overhauling the engine
Refit the strut between the multifunction support and
the exhaust gas recirculation valve support, tightening
the bolts to torque (1 daNm).
Refit the power assisted steering pump rear bolt,
tightening to torque (2.1 daNm).
10A
ADJUSTING THE TIMING METHOD
Set the crankshaft at top dead centre (the TDC
mark (1) on the crankshaft accessories pulley
must be in the vertical axis of the engine).
Remove the timing sprocket from the exhaust
camshaft, to facilitate fitting of the timing belt.
Loosen the three inlet camshaft timing sprocket bolts
by up to one turn.
10A-162
ENGINE AND PERIPHERALS
Overhauling the engine
Fit the timing belt, starting with:
● the intermediate sprocket (1),
● then the pulley (2),
● then the inlet camshaft sprocket (while trying to keep the bolts in the
centre of the sprocket openings),
● and finally the tension wheel (3).
Fit the exhaust camshaft sprocket on the belt.
Position it on the camshaft hub while trying to keep the bolts in the centre of
the sprocket openings.
Reinsert the three sprocket mounting bolts without tightening them.
10A-163
10A
ENGINE AND PERIPHERALS
Overhauling the engine
10A
TIMING BELT TENSION
Check that the tab (1) of tool Mot. 1537 can move
freely in the vertical axis.
The moving pointer (5) of the tension wheel must be
aligned with the edge (6).
Insert a 6 mm Allen key into the tension wheel cam
opening (2).
Check that the bolts (8) are not at the end stop of the
camshaft timing sprocket openings.
Turn the tension wheel cam anticlockwise until the
surface (3) of the tab (1) is aligned with the upper
surface (4) of tool Mot. 1537.
10A-164
Tighten to torque:
– the tension wheel bolt (7) (2.5 daNm),
– the camshaft timing sprocket bolts (8) (1 daNm).
ENGINE AND PERIPHERALS
Overhauling the engine
Remove the camshaft setting tools Mot. 1534 and
Mot. 1537, and the TDC setting rod Mot. 1536.
10A
For the inlet camshaft:
Turn the crankshaft clockwise through two revolutions
at the timing end.
Set the crankshaft at top dead centre (the TDC mark
on the crankshaft accessories pulley must be in the
vertical axis of the engine).
The camshaft grooves must be positioned vertically as
shown in the diagram (top view zoom).
Refit tools Mot. 1534 and Mot. 1537 in the camshaft
grooves following the instructions below.
Mount tool Mot. 1534, screwing in the bolt (1) by hand.
Loosen the three camshaft sprocket bolts (2) by up to
one turn.
Turn the inlet camshaft clockwise with the hub
mounting bolt (3) (using a 16 mm tubular hexagon box
spanner) in order to secure tool Mot. 1534 against the
cylinder head, then lock the Mot. 1534 bolt (1).
10A-165
ENGINE AND PERIPHERALS
Overhauling the engine
For the exhaust camshaft:
10A
CHECKING THE TIMING AND THE TENSION
Undo the tension wheel bolt (7) while holding the cam
with a 6 mm Allen key.
Turn the tension wheel cam clockwise until the
surface (9) of the tab (1) is aligned with the upper
surface (4) of tool Mot. 1537.
Mount tool Mot. 1537, screwing in the bolt (4) by hand
.
Loosen the three camshaft sprocket bolts (5) by up to
one turn.
Turn the exhaust camshaft clockwise by the hub
mounting bolt (6) (using a 16 mm tubular hexagon box
spanner) in order to secure tool Mot. 1537 against the
cylinder head, then lock the Mot. 1537 bolt (4).
Check that the tab (1) of tool Mot. 1537 can move
freely in the vertical axis.
The moving pointer (5) of the tension wheel must be
located in the middle of the groove (10).
10A-166
ENGINE AND PERIPHERALS
Overhauling the engine
Tighten to torque:
– the tension wheel bolt (7) (2.5 daNm),
– the camshaft timing sprocket bolts (8) (1 daNm)
Remove the camshaft setting tools Mot. 1534 and
Mot. 1537 and the TDC setting rod Mot. 1536.
Refit the TDC setting rod hole cap, applying a drop of
RHODORSEAL 5661 to the thread and tightening to a
torque of 3 daNm.
10A-167
10A
ENGINE AND PERIPHERALS
Overhauling the engine
Refit:
– the timing cover, tightening the bolts to a torque of (1 daNm),
– the lifting eye (1), tightening the bolt to torque (2.1 daNm),
10A-168
10A
ENGINE AND PERIPHERALS
Overhauling the engine
Refit:
– the cylinder head suspended mounting, tightening the bolts to torque
(2.5 daNm).
10A-169
10A
ENGINE AND PERIPHERALS
Overhauling the engine
10A
Centre the clutch plate using the centring mandrels
(Emb. 1518).
Refit the mechanism.
Self-adjusting clutch mechanisms must be
compressed using the tool Emb. 1604, following the
method described below.
Place the baseplate of tool Emb. 1604 in a vice.
Screw on the nut until it locks. Then insert a pair of
circlip pliers at (6).
Mount the mechanism and then the ball thrust bearing
(4) and the nut (5) on the base.
10A-170
ENGINE AND PERIPHERALS
Overhauling the engine
10A
Remove the mechanism from the base (checking that
the springs are correctly compressed).
Refit the mechanism on the flywheel, tightening the
bolts to torque (1.2 daNm).
Compress the springs (7), then release the
mechanism by completely unscrewing the nut (5) while
keeping the springs compressed.
10A-171
ENGINE AND PERIPHERALS
Overhauling the engine
Refit the accessories belt by turning the key to the left to remove the 4 mm
Allen key from the hole (2).
Remove the engine from the support (Mot. 792-03).
WARNING
Never rotate the engine with the crankshaft accessories pulley not fitted
with the belt, to prevent internal destruction of the pulley.
10A-172
10A
ENGINE AND PERIPHERALS
Overhauling the engine
Refit the exhaust manifold, equipped with a new seal (with the foolproof fitting
holes (A) at the timing end), then tighten the nuts in order and to torque
(2.7 daNm).
Refit the relay bearing, tightening the bolts to torque (6.2 daNm).
10A-173
10A
ENGINE AND PERIPHERALS
Overhauling the engine
10A
RAIL PROTECTOR
Model 1
Put some RHODORSEAL 5661 on the cylinder head
at the point indicated by a black cross in the diagram.
– mount the upper strap (7),
– refit the partition mounting bolt (8),
– reconnect the diesel fuel drain pipe (9), checking
carefully that it is not blocked.
To refit the side partition on the lower metal protector
be sure to follow the procedure below:
– mount the lower strap (5).
– mount the partition rubber ring (6) onto the lower
metal protector,
– then mount the upper section of the partition on the
metal protector,
10A-174
Refit:
– the soundproofing pads, replacing them if they are
damaged or soaked with diesel fuel.
ENGINE AND PERIPHERALS
Overhauling the engine
10A
Refit the sealing partition, mounted on the rocker cover
by two nuts.
Check that the mark (10) on the rail partition is
positioned correctly (in the axis of the high
pressure rail outlets).
Check that the new diesel return pipe is correctly
attached to the injectors and to the pressure relief
valve at the end of the rail.
Fold the rubber flap forward and clip the side sealing
partitions to the flap.
Check that the clip buttons are correctly fastened
to the partitions and that the rubber flap skirts are
correctly positioned.
WARNING
Check that the diesel fuel drain pipe is correctly
connected.
Clip the rubber flap onto the rocker cover and the
engine mounting.
Check that the rubber flap is correctly fitted on the
rocker cover and engine mounting points.
10A-175
ENGINE AND PERIPHERALS
Overhauling the engine
Model 2
Refit the rail protector plastic cover.
Reconnect the oil vapour rebreathing pipe.
10A-176
10A
ENGINE AND PERIPHERALS
Overhauling the engine
Refit the turbocharger, tightening the nuts to torque (2.7 daNm).
Refit the turbocharger oil return pipe, tightening the bolts to torque (1 daNm).
Refit the turbocharger oil supply pipe, tightening the hollow bolts to torque
(2.3 daNm).
Note:
Check the turbocharger lubrication circuit, especially making sure that there
is no contamination and checking the conformity of the hollow bolts.
10A-177
10A
ENGINE AND PERIPHERALS
Overhauling the engine
Refit the exhaust heat shield, tightening the bolts to torque (1 daNm).
10A-178
10A
Was this manual useful for you? yes no
Thank you for your participation!

* Your assessment is very important for improving the work of artificial intelligence, which forms the content of this project

Download PDF

advertising