Sunbeam ALPINE I SERIES: APLINE II SERIES, Workshop Manual, Page: 57 / 413

WSM.124
Section B (Engine)
CAMSHAFT BEARINGS
To remove
Using special tool (V. L. Churchill RG 32), the front
and centre bearings can be withdrawn forwards.
The gearbox, clutch and flywheel, together with
rear sealing disc will have to be removed to enable
rear bearing to be withdrawn rearwards.
This operation will, in all probability, be carried out
on most occasions when an ·engine Is overhauled,
Fig.
18.
Camshaft bearing
remover
and replacer
and will be facilitated with the cylinder block in a
stripped condition.
Replacement bearing shells require no matching.
Operation of the special tool is shown in Fig. 18.
To refit
Using tool RG 32, draw in the bushes. Ensure that
the oil feed holes are correctly aligned, and that
the camshaft sealing disc is made oil tight.
INLET AND EXHAUST MANIFOLD
To remove
Drain cooling system as inlet manifold jacket is
coupled to cylinder head and water pump.
Remove air cleaner.
Disconnect water hose from the water pump to the
inlet manifold water jacket, and the water feed pipe
at the rear and of the inlet manifold.
I st re-issue
Page 19
Loosen exhaust pipes from engine at the •y'
junction in the exhaust pipe (Alpine only).
Disconnect exhaust pipe at exhaust manifold flange
(Rapier only).
Disconnect throttle control rod, choke control and
fuel feed pipes.
Remove clamps, long bolt, and nuts holding the
manifold assembly to the cylinder head. Lift off
manifolds leaving the carburettors on the inlet
manifold to save disturbing the throttle synchro­
nization.
To refit
Refitting is a reversal of the removal procedure.
Ensure that the inlet manifold locating rings are in
position.
Refill the cooling system and check water connec­
tions on the inlet manifold for leaks.
If the carburettors have been removed the throttles
should be synchronized and the slow running
adjusted as described In Section C.
COMPRESSION PRESSURES
An engine in good condition should give the com­
pression pressures given in the Data Section under
"Engine-General". These pressures should be
taken at starter cranking speed with the throttle
held fully open, all sparking plugs removed and the
engine hot. If readings are obtained substantially
below these quoted, the engine concerned is in
need of attention to the valves or piston rings, or
possibly requires reborlng.
CYLINDER HEADS
Aluminium alloy cylinder heads are used on these
engines. Owing to the high expansion rate of the
cylinder head material, valve guides, valve seat
Inserts, and sparking plug tubes can only be fitted or
removed when the cylinder head has been uni­
formly heated to 200 ° C. (390 ° F.).
Valve stem diameters, valve head diameters, valve
seat angles, valve stem clearances in the valve guide,
and combustion chamber volume are given In the
Data Section.