Page 95 - Vauxhall 20-60 H.P. (R Type) Chassis Shop Manual

VAUXHALL 20-60 SHOP MANUAL

VALVE TIMING ( After R 3060 )

SECTION On cars bearing chassis number R 3061 and onwards, the valve timing is as
433 follows:— The valve clearance of 007” is taken up in 37 / 4 ° of crankshaft rotation.
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1
The inlet valve opens at T.D.C. and closes at 57° past B.D.C. The exhaust valve
opens at 62° before B.D.C. and closes at 25 past T.D.C. To check the valve timing
with the engine in position, the same method may be adopted as described in
( Section 432 ), but on these cars the inlet valve leaves its seating at T.D.C. and
the exhaust valve closes 8 teeth after T.D.C. as marked on the flywheel.

NOTE:— The inlet valves are not masked on cars bearing chassis number

R 3061 and onwards.

IGNITION TIMING

( See Figure 27 )

SECTION The cylinders fire in the following order 1, 5, 3, 6, 2, 4, No 1 being the cylinder
434 nearest the radiator.

If it has been necessary to remove the distributor from the engine, or if the
ignition timing has been disturbed, proceed as follows:—

– Turn the engine over by hand until the T.D.C. mark on the flywheel
corresponds with the mark on the side of the flywheel inspection hole,
with No. 1 piston on its compression stroke, i.e., both valves will be closed.

– Place the ignition control lever in the fully retard position and slacken
the distributor clamping bolt ( Fig. 27 ).

The distributor body is then free to rotate about the cam spindle. The
body of the distributor should then be turned to that position in which the
contacts ‘A’, are on the point of opening when the engine is turned in the
correct direction of rotation. If it is then found that the high tension leads
are not conveniently placed, it will be necessary to remove the distributor,
rotate the spindle and replace with the gear meshing in such a way that the
leads are correctly placed. The ignition timing having been correctly set,
thoroughly tighten the distributor clamping bolt.

CONNECTING RODS AND PISTONS

( Before R3061 )

SECTION Description — The connecting rods are of duralumin, with big end bearing
435 liners of gun metal, white metal lined. Pistons are of cast iron and fitted

with three rings, the lower one being a scraper ring.

The gudgeon pin is a floating fit in the piston and a press fit in the small
end of the connecting rod. The majority of these cars have been treated for
small end rattle, in which cases the gudgeon pin is a floating fit in the rod and
piston and is located by means of a circlip fitted into grooves machined in the
gudgeon pin bearings of the pistons. In the event of it being found that circlips

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