25-30HP Condensed Handbook XVII Chap1

25-30HP Condensed Handbook XVII Chap1
HANDBOOK
FOR
25-30 H.P.
ROLLS-ROYCE CAR
CHASSIS SERIES
(In order of Issue)
GUL GRM GAN GRO GRP GAR
GYL GXM GWN GHO GMP GGR
GHL GGM GUN GMO GLP GZR
Liable to alteration without notice
PRICE £ 1. 5. 0
PUBLISHED BY
ROLLS-ROYCE, LIMITED
D ERBY , C REWE ,
AND AT 14 AND 15, C ONDUIT S TREET, L ONDON
CONDENSED EDITION
NO. XVII
Front Brake
Adjustment
Front Axle Control
Steering Pivot
Front Hydraulic
Cross Steering Tube
Damper
ROLLS-ROYCE LIMITED.
Side Steering Tube
Dynamo
Carburetter Air
Silencer
Carburetter
Steering Box
Distribution Box and
Output Regulator
Crankcase Oil Filter
Chassis Oil Pump
Fuel Pumps
Starter Motor Pinion
Housing
London Office and Showroom :
14 & 15, CONDUIT STREET, LONDON, W.
TELEGRAMS: “ROLHEAD REG. LONDON.”
TELEPHONES: MAYFAIR 6201 (7 lines)
CODES USED: A B C (5TH EDITION), BENTLEY’S, MARCONI
MOTOR TRADE, WESTERN UNION
Speedometer Drive
Accelerator Pedal
Clutch Pit Inspection
Cover
Starter Switch
Servo Motor
Switch Box
Grouped Instruments
Hand Brake Lever
Universal Joint
Gear Lever
Foot Brake Equaliser
Strangler Control
Main Service Station:
Hythe Road, Willesden, London N.W. 10
TELEGRAMS: “SILVAGOST, WESPHONE, LONDON”
TELEPHONE: LADBROKE 2444
Crewe Repair Depôt:
Pym’s Lane, Crewe
TELEGRAMS: “ROYCRU, CREWE”
Brake Rods
Ignition Control
TELEPHONE: CREWE 3271 (10 LINES)
Throttle Control
Brake Ropes
Hand Brake
Equaliser
Spring Gaiter
Rear Hydraulic
Damper
Universal Joint
Battery
Rear Axle Filling
Plug
Rear Brake
Adjustment
Fuel Tank Filler
Fuel Gauge Unit
Fig.1. - Plan View of Chassis.
Authorised Paris Service Station:
Franco-Britannic Autos Ltd.
25 Rue Paul Vaillant Couturier, Levallois, Seine
TELEGRAMS: “FRANCOBRIT-LEVALLOIS-PERRET-FRANCE”
TELEPHONE: PERIERE 60-24
CONTENTS
THE
SECRET OF SUCCE S S F U L
RUNNING.
Before a Rolls-Royce chassis is sold it is very
carefully tested and adjusted by experts.
It will run best
if no attempt be made to unnecessarily interfere with
adjustments.
An owner would do well to instruct his driver as
follows:Lubricate effectively, in strict accordance with the
advice given in this Handbook, and do not neglect any
part.
Inspect all parts regularly, but take care not to alter
any adjustments unless really necessary.
SERVICE FACILITIES fOR ROLLS-ROYCE CARS ...
...
...
LEADING PARTICULARS OF CHASSIS
...
5
CHAPTER I.- STARTING THE ENGINE AND DRIVING THE CAR Starting the Engine - Ignition Control-Throttle Control-Change
over Switch for Fuel Pump- Fuel Gauge-Gear Changing-Controllable Shock Dampers-Lighting Control and Switch-Radiator
Shutters-Overheating-Fitting of Snow Chains.
7
CHAPTER II.- PERIODIC LUBRICATION AND ATTENTION
...
Lubricants Recommended-Capacities-Centralised Chassis Lubrication System-Daily Maintenance-Every 2,000 miles-Tappet
Adjustment-Every 5,000 miles-Every 10,000 miles-Every
20,000 miles-Care of Wheels and Hubs-Replacement TyresBalancing Road Wheels.
13
CHAPTER III.- FUEL SYSTEM ...
... ...
...
...
...
The Fuel System - Fuel Pumps - Petrol Filters - Action of the
Carburetter-Accelerator Pump-Economiser Jet-Strangler Control for Starting - Adjustment of Carburetter-Setting of Idling
Adjustment-Diagnosis of Faults-Float Feed Mechanism-”Hot
Spot”-Air Silencer and Cleaner.
30
CHAPTER VI.-ADJUSTMENT OF BRAKES ...
...
...
...
General-Adjustment of Foot Brakes-Adjustment of Hand Brakes
-Adjustment of Servo.
40
CHAPTER V.- THE CLUTCH...
Adjustment of Clutch.
...
45
CHAPTER VI.- COOLANT SYSTEM
... ...
...
...
...
Coolant Pump-Radiator Shutters-CoolantLevel-Frost PreCautions-Fan.
46
CHAPTER VII.- ELECTRICAL SYSTEM ... ...
...
...
...
General-Battery-Battery Ignition-Sparking Plugs-Electrical
Fault Location
50
GUIDE TO MAIN SERVICE STATION
...
...
...
...
...
...
...
...
PAGE
4
...
...
...
...
...
55
GIUDE TO CREWE SERVICE STATION ...
...
...
...
...
56
SERVICE FACIL I T I E S
FOR ROLLS-ROYC E C A R S
Our interest in your Rolls-Royce car does not cease
w h e n y o u t a k e d e l i v e r y o f t h e c a r. I t i s o u r a m b i t i o n t h a t
every purchaser of a Rolls-Royce car shall continue to be
more than satisfied.
Wi t h t h i s e n d i n v i e w, w e h a v e a p p a o i n t e d S p e c i a l
Retailers throughout the world, who have established
p r o p e r l y e q u i p p e d S e r v i c e S t a t i o n s , s t a ff e d b y m e n w h o h a v e
been specially trained in servicing Rolls-Royce cars.
I n a d d i t i o n , o n t h e s t a ff o f R o l l s - R o y c e L i m i t e d , t h e r e
are experts whose sole duty it is to maintain contact with
the Special Retailers, and they are available at all times to
b e c a l l e d i n f o r c o n s u l t a t i o n o n a n y m a t t e r s a ff e c t i n g y o u r
c a r.
If, therefore, you should require any assistance,
we ask that you should immediately contact our nearest
S p e c i a l R e t a i l e r, w h o w i l l o n l y b e t o o p l e a s e d t o p l a c e h i s
facilities at your disposal. If necessary he will call in for
consultation our expert in that area. It is earnestly hoped
that this arrangement will prove of mutual benefit, as we
will thus be kept in constant touch with our Customers, who
may be spared the trouble of a long journey to one of our
C o m p a n y ’s S e r v i c e S t a t i o n s .
In the event of it being more co n v e n i e n t t o c a l l o n u s
d i r e ct for assistance, o u r M a i n S e r v i c e S t a t i o n a t H y t h e
R o a d , Wi l l e s d e n , L o n d o n N . W. 1 0 , a n d t h e o n e a t o u r
factory at Crewe, will be ready at all times to help. (See
maps at end of Handbook.)
L E A D I N G PA RT I C U L A R S O F C H A S S I S .
Engine.
Six cylinders, 3½” (89m/m.) bore, 4½” (114 m/m.) stroke, 4.257 c.c.,
29.4 H.P. on R.A.C. rating. Unit construction with gearbox, monobloc
with detachable head, overhead valves operated by pushrods, RollsRoyce battery ignition with automatic advance, forced lubrication,
cooling by pump circulation, down-draught carburetter.
Electrica l E q u i p m e n t .
Twelve-volt Rolls-Royce dynamo, starter motor, and other units.
Approximately 60 ampere-hour battery.
Clutch.
Single dry plate.
Gearbox.
Four-speed and reverse, side control; speedometer and brake servomotor drives incorporated.
Rear Axl e .
tubes.
Hyphoid gears, full floating, rosd wheels entirely carried on axle
Br akes.
Internal expanding, servo operated, on all four wheels. Independent
hand brake operating on rear wheels.
Road Spr i n g s .
Semi-elliptic, front and rear.
W heels.
Wheels with 19” well-base rims and Dunlop C type tyres, size
6.00-19 are fitted.
W heelbase.
132”
Tr a ck .
56
Starting the Engine and Driving the Car
Tu r n i n g C i r cles.
Centre of outside front tyre:
R.H., 47’ 5” diameter;
L.H., 42’ 0” diameter
O v e r w i n g s above centre line of front axle:
R.H., 48’ 6” diameter;
L.H., 43’ 1” diameter
F u e l Ta n k .
Eighteen gallons capacity, at rear of chassis. Supply by electric
pumps.
C h a s s i s L u b r ication.
Centralised system, pedal-operated pump.
We i g h t .
7
CHAPTER I
5/16 ”
STARTING THE ENGINE AND DRIVING THE CAR
Chassis complete with tyres, battery, fuel, oil and water, but
excluding spare wheel, lamps and other accessories - approximately
2,930 lbs.
Starting the Engine - Ignition Control-Throttle Control - Change over Switch for Fuel Pump - Fuel Gauge - Gear ChangingControllable Shock Dampers - Lighting Control and Switch - Radiator
Shutters - Overheating - Fitting of Snow Chains. Starting the Engine.
To start the engine, first check that the change gear lever is
in neutral, set thumb lever on instrument board to Start, switch on
the ignition by turning the right-hand thumb lever on the switchbox
to I.& C. - on later models to On- retard the ignition about onequarter from top of quadrant, and set hand throttle lever at bottom
of the quadrant. Now depress the starter button firmly and to its full
extent.
As soon as possible after the engine starts, set the hand throttle
lever a little over half-way up its quadrant and move thumb lever to
Run. At the same time, advance ignition hand lever to the top of
its quadrant.
When making a start with a warm engine, leave thumb lever at
Run and set hand throttle lever a few notches up its quadrant and
ignition lever fully advanced.
The action of switching on the ignition also switches on the electric
fuel pumps, and a few pulsations of the latter may then be heard.
An appreciable pause must be made between the operations of switching
on the ignition and depressing the starter button, especially when making
a start from cold. This is necesary in order to give time for the pumps to
fill the float chamber of the carburetter.
A small red warning lamp on the instrument board will be illuminated when the ignition is switched on, but will be extinguished when
the engine speed is sufficient to cause the cut-out contacts to close.
On no account should the accelerator pedal be “jiggled” when
using the starter motor-or indeed at any time. Such movement brings
into action the accelerator pump provided on the carburetter and
causes liquid fuel to be injected into the carburetter.
The thumb lever control on the instrument boardis arranged to
provide a suitably rich mixture for starting from cold, and it should
only be turned to Start under these conditions. Normally, it should
stand at Run. It is not intended for varying the mixture strength
under running conditions.
8
ROLLS-ROYCE 25-30 H.P. CAR
It will be observed that when starting from cold the hand throttle
lever is set in the closed position, i.e., at the bottom of its quadrant. The
reason for this is that there is an interconnection between the throttle lever
on the carburetter and the instrument board thumb lever which causes
movement of the latter to Start, to open the throttle simultaneously the
required amount.
As soon as the engine starts, the hand ignition control may be
fully advanced.
When starting the engine for the first time in the day it is a good
plan to form the habit of depressing the chassis oil pump pedal once at
this stage. Subsequently it should be depressed once every 100 miles. If
the car is to be driven only a few miles, however, half a pumpful will be
sufficient at the first starting.
When the engine is cold a high oil presure will be shown on the
gauge, due to the greater viscosity of the oil at low temperatures. The
pressure will fall, however, as soon as the oil becomes warmer.
A starting handle is carried in the tool kit. In the event of it being
used, it should be removed afterwards from the bracket and returned to
the tool kit. The ignition must be fully retarded when starting by hand.
Ignition Control.
When driving the car, the ignition lever should normally be fully
advanced. The actual amount of advance is controlled partly by
hand, as previously indicated, and partly automatically by means of
a centrifugal governor operating on the distributor drive. This is
capable of meeting 90 per cent. of the conditions due to varying road
speeds, leaving only extreme conditions to be met by moving the
hand control on the steering wheel.
Throttle Control.
Under normal running conditions, the hand throttle control should
be carried right back in the closed position.
An adjustable stop is
provided on the carburetter for the throttle lever, which is so adjusted that
the engine will idle reliably in these circumstances when the accelerator
pedal is released.
Change-over Switch for Fuel Pump.
In addition to the ordinary ignition switch, which also switches
on the pumps, a change-over switch is arranged on the instrument board
in order to provide a ready means of checking that each half of the
double fuel pump is operating correctly.
Normally, the switch would stand at Both when both halves of
the pump should be working.
STARTING THE ENGINE AND DRIVING THE CAR
Occasionally a few miles’ running should be done with the
switch moved to “A” position, which cuts out one half of the pump.
At moderate throttle openings, no difference in running should be
noticeable. The test should then be repeated with the switch in the “B”
position, which cuts out the other half and switches on the half first cut
out.
In the circumstances described, failure or defective running of the
engine only evident when the switch is on one side, indicates that one
half of the pump is faulty, and Messrs Rolls-Royce Ltd., or one of their
Special Retailers, should be consulted at the earliest opportunity.
The connections of the change-over switch are shown in the
Electrical Wiring Diagram, Fig. 23.
Fuel Gauge
The electrical fuel gauge on the instrument board is graduated
to register the total amount of fuel in the main tank. The gauge is
inoperative when the ignition is switched off.
Special contacts carried by the tank unit cause the green warning
lamp to light when only about two-and-a-half gallons of fuel remain in
the tank.
Gear Changing
The position of the gear lever for each of the four speeds and
the reverse is shown in Fig.*2. When
reverse is required, the top of the
lever must be depressed. This
releases a catch and enables the
lever to be moved into the gate
marked R.
A special synchronising device
is provided in the gearbox to
facilitate the changes between top
and third gears and from second
to third. All that it is possible to
ensure by such a synchronising
mechanism, however, is that the
gear members to be engaged cannot
be brought together until they are
both rotating at the same speed.
It does not sychronise the engine
and clutch shaft speeds. This must
be done by the driver before reengaging the clutch, otherwise
there will be an unpleasant jerk,
causing unnecessary wear and tear
of the clutch and strain on the transmission.
9
10
ROLLS-ROYCE 25-30 H.P. CAR
It is necessary to depress the clutch pedal fully when changing
gear. The gear lever should then be moved gently into the required
gear position and, before re-engaging the clutch, the engine should
be speeded up when changing down, or allowed to slow down when
changing up, so that its speed shall suit the car speed on the required
gear.
Other changes, namely, those both up and down between second
and first and that down from third to second, must be made in the usual
manner, double clutching when changing down.
Controllable Shock Dampers.
In order to provide comfortable riding at all speeds, a centrifugally
-controlled pump is fitted which causes the damper loadings to increase
with the road speed. In addition, there is a lever above the steering
wheel, marked Riding Control, the effect of which is superimposed
on that of the governor.
For ordinary town work or touring with moderate speeds, it will
be found that the damper loadings as set by the governor are adequate
when the hand lever is either at Soft or mid-way. On the other hand,
at high speeds or with heavy loads, improved riding comfort will be
obtained by moving the lever to Hard.
Lighting Control and Switch
Two types of switchbox are fitted, those on the earlier models
are as under:
Carried on the right-hand end of the instrument board, this unit
includes:
(a) Lamp switch.
(b) Ignition and charging switch.
(c) Push-button for instrument board lamps.
(d) Socket for inspection lamp plug.
(e) A lock which can be locked and the key withdrawn with the switches in only two positions:
(1) When both ignition and lamp switches are at the
off position.
(2) When ignition is at the off position, but the lamp switch is at the S and T position.
Do not try to lock the switch in other positions.
The switches (a) and (b) are operated by thumb levers, and the
various combinations controlled by each are clearly indicated by the
letters as follows:
OFF ... ... No circuits in action.
S and T
... Side and tail lamps on.
H, S and T ... Head, side and tail lamps on.
STARTING THE ENGINE AND DRIVING THE CAR
11
I and C
... Ignition on, fuel gauge and fuel pumps on, and
connections closed to enable the dynamo to charge the battery .
On the later models a modified form of switchbox is provided
incorporating a master switch.
The unit is carried on the right-hand end of the instrument board
and includes:
(a) Master switch and lamp switch combined.
(b) Ignition switch.
(c) Push-button switch for starter motor.
(d) Socket for inspection lamp plug.
(e) A lock which can be locked and the key withdrawn either:
(i.) When the master switch is in the “Off” position;
or
(ii.) When the master switch is in the P.L. (“parking lights”)position;
No attempt must be made to lock the switch in other positions.
With the master switch in the “off” position, most circuits and
accessories such as horns, starter motor, ignition, windscreen wiper,
instrument lamps etc., are rendered inoperative. Movement of this
master switch to the “on” position renders these accessories available.
The various combinations conrolled are clearly indicated as
follows:
OFF ... ... All circuits off, except for clock.
ON ... ... Accessories available
S and T
... Side and tail lamps on and accessories available.
H, S and T ... Head, side and tail lamps on and accessories available.
P.L. ... ... “Parking lights”, side and tail lamps on, acces-
sories off.
A separate ignition switch is provided, marked ON and OFF
Normally, this switch can be left in the “on” position, and the switching
to start and stop the engine can be carried out on the master switch.
No independent charge position is provided owing to the presence
of the output regulator. Whenever the master switch is on, connections
are made which cause the dynamo to charge the battery through the
regulator, as elsewhere described.
Radiator Shutters.
The radiator shutters are controlled automatically by means of a
thermostat in the upper radiator tank.
A themometer is provided on the instrument board to indicate
that the shutters are operating properly and that there is no shortage of
coolant.
The hand-operated ventilators on the sides of the bonnet should
be left open in hot weather.
12
ROLLS-ROYCE 25-30 H.P. CAR
Overheating.
If on long ascents which call for full throttle, “boiling” should
occur due to abnormal conditions of atmospheric temperature, and,
or, following winds, etc., it is preferable to change into a lower gear
and reduce the throttle opening.
Adjustment of the fan belt may be necessary, and this should
receive attention.
Fitting of Snow Chains.
In the event of snow chains being necessary, they should be
fitted to the rear wheels only.
A Parsons’ chain, known as the “Special Rolls-Royce Type”, is
available. It is recommended that these be obtained through Messrs.
Rolls-Royce Ltd., or one of their Special Retailers, in order to ensure
the supply of the correct type.
When fitting these special chains, it is essential to commence
by fastening the one hook on the inside of the wheel and always to
take up the adjustment on the outside, where two fastening clips are
provided. The tensioning springs which are supplied to go on the
outside of the wheel must always be fitted.
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

advertisement