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If a tappet becomes noisy, it may be silenced by adjusting the clearance to the
correct amount. Do not set the valve clearances too small or the engine will not
maintain good tune.
Adjustment of Valve-Tappet Clearance
Remove the tappet cover and turn the crankshaft with the starting handle for half a
revolution after the valve to be adjusted has closed. Slacken the lock nut and adjust
the tappet screw until the gauge is a sliding fit between the valve stem and the
tappet adjusting screw. Now tighten the lock nut and check that the clearance has
not altered.
Ignition Timing
The ignition advance is automatic and when fully retarded, i.e., engine at rest, the
ignition should be set to fire 2° before top dead centre.
The ignition is correctly set at the works and should not normally be adjusted,
excepting that after the car has covered a considerable mileage it may be necessary,
due to the increased carbon deposit, to set back the ignition slightly to prevent a
metallic sounding noise termed "pinking." It is evident when pulling hard up-hill or
when accelerating from low speed in top gear.
RUNNING ADJUSTMENTS—Engine
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