IF_No._3136
M50/PSU
IF NO. 3136
Selecting Correct Injection Pump Timing Button and Injection
Pump Installation
Read through these instructions completely before beginning the actual installation. Perform the following
steps in the order listed and refer to the illustrations for clarifications as required. Retain the packing list
for use when ordering replacement parts
WARNING
This symbol is used throughout this instruction sheet to warn of possible serious
personal injury or death.
CAUTION This symbol refers to possible equipment damage.
Remove both battery cables from the battery. Disconnect negative battery cable first.
WARNING Accidental starting of the engine might cause severe personal injury
or death. Disconnect the battery cables when repairs are made to the engine, controls, or housing.
This instruction sheet applied to 2 and 4 cylinder Onan Diesel models DJBA, DJB, DJC, MDJB,
MDJC, RDJC, MDJE, MDJF, RDJE, RDJEA, and RDJF using the AMBAC PSU or Model 50
Injection pump.
CAUTION Keeping the fuel system clean is extremely important. A fine particle of dirt can ruin
the injection system in a very short time. If the fuel system is opened for any reason, cap all openings
and place the parts removed in clean diesel fuel. Before installing new or used parts, wash them in
clean fuel and install them wet.
CAUTION Preservative oil applied to the new injection pump during assembly may cause the
pump to stick. Forcing the plunger or gear will damage the pump. Dissolve preservative by soaking
pump in clean filtered diesel fuel for 15 to 30 minutes.
TIMING BUTTON CODE
The timing button has a code number or letter stamped on it that corresponds with its dimension in
thousandths of an inch. See Table 1. Figure 1 shows the timing button. One of these buttons will
provide the correct port closing.
CODE LETTER OR NUMBER
STAMPED ON SIDE
FIGURE 1. TIMING BUTTON CODE
1/21/2009
1
Rev Level A
Ambac International, 910 Spears Creek Court Elgin SC 29045(USA) – North America
Telephone: 1-800- 628-6894
Fax: 1-800-542-8230
Printed in USA
Website: www.ambac.net
M50/PSU
IF NO. 3136
TIMING BUTTON THICKNESS
The injection pump on each engine must be timed to that engine by using a timing button of specific
thickness. Each new pump has its port closing dimension stamped on the pump mounting flange.
This port closing dimension is measured at the factory using a number 11 or standard button.
Pump timing is critical. Use one of the two timing methods to determine correct new button
thickness. If the correct button is not supplied with the replacement pump refer to Table 1 and order
the correct one from AMBAC International.
TABLE 1. PLUNGER BUTTONS
Thickness
Part No.
.089” (2.26mm)
.092” (2.34mm)
.095” (2.41mm)
.098” (2.49mm)
.101” (2.56mm)
.104” (2.64mm)
.107” (2.72mm)
.110” (2.79mm)
.112” (2.84mm)
.116” (2.95mm)
.119” (3.02mm)
.122” (3.10mm)
.125” (3.17mm)
.128: (3.25mm)
.131” (3.33mm)
.134” (3.40mm)
BO853-10
BO853-9
BO853-8
BO853-7
BO853-6
BO853-11
BO853-5
BO853-4
BO853-3
BO853-2
BO853-1
BO853-12
BO853-13
BO853-14
BO853-15
BO853-16
IMPORTANT:
Identification
10 or L
9 or K
8 or J
7 or H
6 or F
11
5 or E
4 or D
3 or C
2 or B
1 or A
12 or M
13 or N
14 or P
15 or R
16 or S
Plunger buttons are not included with Model 50 pumps or
hydraulic heads. The required plunger button must be
selected when the new pump, or an old pump with a new head
is installed on an engine.
TIMING PSU OR MODEL 50 INJECTION PUMP
One of two methods can be used, to determine the proper timing button to correctly time the fuel
injection pump to the engine.
Method 1: Timing by Calculation
This procedure is used, when all dimensions are available for replacing an old pump, before the
pump is installed. Timing by calculation requires the port closing dimensions and button thickness
from the pump being replaced. It also requires the port closing dimension of the new pump. Put the
1/21/2009
2
Rev Level A
Ambac International, 910 Spears Creek Court Elgin SC 29045(USA) – North America
Telephone: 1-800- 628-6894
Fax: 1-800-542-8230
Printed in USA
Website: www.ambac.net
M50/PSU
IF NO. 3136
dimensions in the PORT CLOSING FORMULA and calculate the new button thickness. After
determining the timing button thickness, find the button code in Table 1.
If injection pump is removed from the engine, make sure the steel shims between pump and cylinder
block mounting remain the same. These shims maintain proper gear backlash.
CAUTION
Do not change the pump mounting shim’s total thickness or the proper pump gear
to camshaft gear mesh will be affected. The shim’s thickness is established at the factory during
engine assembly and does not change unless a new cylinder block is installed.
PORT CLOSING FORMULA: The formula for determining the proper port closing (PC) timing
button for a new or replacement pump is as follows:
1.
Remove old pump.
2.
Determine port closing dimensions and original button thickness from old pump.
A. Write down port closing dimension given on old pump flange and port closing
dimension given on new pump flange. See example.
B. Use a pair of channel lock pliers or screwdriver to remove tappet, retaining ring,
and timing button from old injection pump (Figure 2). Use number or letter code
on timing button to obtain dimension of old timing button from Table 1. This code
should be the same as the code number stamped on injection pump (figure2).
MAXIMUM THROTTLE
STOP SCREW
PORT CLOSING
DIMENSION STAMPED
ON THIS FLANGE
ORIGINAL TIMING
BUTTON CODE
STAMPED ON THIS
FLANGE
BUTTON
O-RING KEEPS TAPPET
IN DURING HANDLING
GROOVE
TAPPET
FIGURE 2. TAPPET REMOVAL
CAUTION
On all PSU pumps be sure to hold the pump drive gear securely to the pump body
when removing the tappet. If not, the pump will come apart and be difficult to assemble. The
1/21/2009
3
Rev Level A
Ambac International, 910 Spears Creek Court Elgin SC 29045(USA) – North America
Telephone: 1-800- 628-6894
Fax: 1-800-542-8230
Printed in USA
Website: www.ambac.net
M50/PSU
IF NO. 3136
metering sleeve will drop off the plunger if the gear and plunger are removed. If the plunger port is
not enclosed by the sleeve, there will be no fuel delivery and the pump will not operate.
3.
Add dimension on old pump flange to timing button dimension. See example:
Example:
Inches (mm)
Port closing dimension of old pump
Button thickness of old pump
Total
1.109
+.107
1.216
(28.168)
( 2.719)
(30.887)
Port closing dimension of new pump
Required button thickness of new pump
-1.094
.122
(27.788)
( 3.099)
4.
Subtract port closing dimension given on new pump flange from total dimension for old
pump.
5.
Use dimension calculated to select new timing button that is nearest the calculated
dimension. Install new timing button in pump and install tappet on pump.
6.
Install injection pump. Refer to INJECTION PUMP INSTALLATION.
INJECTION PUMP INSTALLATION
Be sure the steel shims between the pump and the cylinder block mounting are the same. These
shims maintain proper gear backlash. The number stamped on the cylinder block injection pump
mounting pad indicates the proper shim thickness. This thickness does not change when a new pump
is installed. It only changes when a new cylinder block is installed.
1.
Turn engine in direction of rotation (clockwise when viewed from the front of engine)
until number one cylinder is on a compression stroke and the PC mark on flywheel lines
up with timing pointer on gear case (Figure 0206). Rotation clockwise also takes out all
gear backlash in that direction.
Look into injection pump mounting hole to verify that one intake lobe points outward
and down 45 degrees.
1/21/2009
4
Rev Level A
Ambac International, 910 Spears Creek Court Elgin SC 29045(USA) – North America
Telephone: 1-800- 628-6894
Fax: 1-800-542-8230
Printed in USA
Website: www.ambac.net
M50/PSU
2.
IF NO. 3136
Remove screw (Figure 9) on side of injection pump. Rotate drive gear until a .125 inch
(3.175 mm) brass rod can be inserted into drive gear slot. This locks the gear in position
when installing injection pump on engine.
ROTATE FACE GEAR UNTIL
BRASS ROD SLIPS INTO
PLACE LOCKING GEAR
INSERT BRASS ROD
FIGURE 9. INSERT BRASS ROD
3.
With injection pump drive gear locked, place pump in mounting hole. Hold pump
firmly against cylinder block. A slight spring pressure indicates that the pump and
camshaft gears are meshed (Figure 10).
4.
PUMP
SHIMS
PUMP
MOUNTING
FLANGE
ENGINE BLOCK
FACE GEAR
PUMP TAPPET
ENGINE
CAMSHAFT
MULTI-LOBE CAM
DRIVE GEAR
FIGURE 10. PUMP INSTALLED
1/21/2009
5
Rev Level A
Ambac International, 910 Spears Creek Court Elgin SC 29045(USA) – North America
Telephone: 1-800- 628-6894
Fax: 1-800-542-8230
Printed in USA
Website: www.ambac.net
M50/PSU
5.
6.
IF NO. 3136
If gears mesh, secure pump using a flat washer, lock washer, and nut on each stud.
Torque nuts evenly to 5 to 16 ft.-lb. (20 to 22Nm).
Remove brass rod and install timing hole washer and screw.
Method 2: Flow Timing Injection Pump
Use this procedure to time pump when dimensions from old pump are not available. Begin by
installing pump which has been fitted with standard timing button (may be unmarked or marked
number 11).
1.
Refer to Fig. 0210 and remove cap nut from delivery valve and delivery valve holder,
then lift out delivery valve spring. Reinstall holder and cap nut. Note that early models
do not have a delivery valve holder.
2.
Rotate flywheel until PC mark on flywheel is about 15° from timing pointer in
compression stroke of number 1 cylinder. Place fuel control at full speed position.
Disconnect high pressure line from number 1 injector. Operate transfer pump priming
lever (fuel should flow from disconnected injector line) while slowly turning flywheel
clockwise. When fuel flow from line stops, this is port closing point and beginning of
injection. At this point, port closing (PC) mark on flywheel should be aligned with
timing pointer if timing button is correct.
A. If timing pointer is ahead of port closing mark, timing is early and a thinner
button is needed. If timing pointer is between PC and TDC marks, timing is late and
a thicker button is must be installed.
B. To select correct button size, carefully measure space between PC mark and timing
pointer. Each 0.100 inch (2.54mm) on flywheel circumference is equivalent to 0.003
inch (0.076mm) button thickness. Refer to table 1.
Example. Standard button installed in pump for test is 0.104 inch (2.642 mm) thick. Flow of
fuel stops 0.2 inch (5.08mm) after PC mark is passed indicating late timing. Referring to
table 1, it will be noted that button of code 4 or D is 0.110 inch (2.794mm) thick or 0.006 inch
(0.152 mm) thicker than standard button. Installing this button in place of test button should
time injection pump correctly.
3.
After pump is correctly timed, reinstall delivery valve spring. Tighten delivery valve holder
to torque of 65-70 ft.-lbs.. (90-95 N·m) and cap nut to 55-60ft.-lbs (75-80 N·m). Complete
installation of pump as outlined.
1/21/2009
6
Rev Level A
Ambac International, 910 Spears Creek Court Elgin SC 29045(USA) – North America
Telephone: 1-800- 628-6894
Fax: 1-800-542-8230
Printed in USA
Website: www.ambac.net
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