RUNNING ADJUSTMENTS-
Engine
3.
A
neK gasket must be fitted each time the cylinder head is removed.
The plain side of the gasket must be downwards against the cylinder
block and should be coated on both sides with
''
WEL1,SEAL"
or
similar non-setting sealing compound.
5.
When replacing the cylinder head nuts, tighten them gradually in the
sequence shown in Fig. 13, in order to produce an even pressure
on
thc
gasket and prevent undue strain in the cylinder head casting.
It will be necessary to recheck the nut tightness when cold to
100-10s
lb.
ft.
6.
The valve springs are close-coiled at one end and should have the closc-
coiled end rowards the cylinder head when refitting. Befbre tightening
down the
rocier pedestals, screw back each adjusting screw and ensure
that the ball ends
of
these screws engage correctly with the push-rods.
Failure
to
attend to these items may result in damage to the push-rods.
The auxiliary ~nner \valve springs must be fitted to the exhaust valves.
7.
Smother the rocker gear with oil, particularly where the rockers bear on
to the valves, before replacing the rocker cover. Ensure that the cork
washer is undamaged and shellaced to the cover, otherwise oil may leak
through the joint.
Cylinder Head Nuts
After the first 500 miles (800 km.) the cylinder head nuts should be
checked for tightness, with engine hot, in the order shown in Fig.
13.
Fig.
13.
Order
of'
tightening cylinder head nuts
Valve-Rocker Clearances
The running clearances are ,010'' (0.25 mm.) Inlet and .012" (0.3 mm.;
Exhaust for normal touring purposes. For high speed motoring the
clearance should be ,013" (0.33 mm.) for both inlet and exhaust, measured
with engine cold.
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