Tappet Adjustment; Adjusting The Tappets - Triumph SPEED TWIN 1945 Workshop Instruction Manual

Tappet
Adjustment
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TAPPET ADJUSTMENT (stt s u r r l - t m t ~
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( M o d e l s ST, 6 T &
TIM))
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These models are fitted w i t h camshafts employing a Ramp-Cam f o r m which makes it
necessary
to
maintain
a
0.010" (0.26 mm.) clearance (COLD), between the valve
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rocker adjusting pin and the valve t i p i n o r d e r t o ensure silent operation and
maximum efficiency. If the clearance i s appreciably iess t h e valve t i m i n g w i l l be
affected resulting i n loss of power and t h e possibility o f b u r n t valves.
M o d e l s T I 1 0 & T R 5
These models have high-lift czmshafts and no silencing ramps are incorporated i n t h e
cam form. The tappet adjustment, therefore, differs f r o m t h e other models, the
inlet being set at 0.002" (0.05 mm.) and the exhaust at 0.004" (0.10 mm.).
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A D J U S T M E N T ( C O L D )
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R o c k e r B o x I n s p e c t i o n Caps.
Remove all four from t h e rocker boxes.
P o s i t i o n i n g t h e Valves. This operation
is
made easier by
f i r s t
removing t h e
sparking plugs.
Turn the engine by the kickstarter u n t i l the t i m i n g side exhaust
valve
is
fully open. This ensures that t h e o t h e r exhaust valve tappet is making
conract w i t h the base of the cam and no e r r o r can be made when checking o r
re-adjusting
it.
Tools. In the toolkit, t , ~ o spanners are provided for this adjustment. (See Fig. 8).
Fig. 8.
A D J U S T I N G
T H E T A P P E T S