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5-4-7 TAPEET ADJUSTMENT
Lower the tappet all the way down, push the valve, and insert a thickness gauge between the valve and
tappet stem to measure the clearance. (See Fig.5-28.)
NOTE: The correct tappet clearance for both intake and exhaust valves is 0.1mm
±
0.02mm when the
engine is cold.
NOTE: If the clearance is smaller than specified, slightly grind the top of the valve stem, and measure it
again. On the contrary if the clearance is too large, replace the valve with new one, and polish its contact
surface with a compound to obtain a good fit. Then adjust the clearance.
NOTE: After the tappet clearance adjustment, install the valve springs and spring retainers, and turn the
crankshaft, and measure the tappet clearance once again if it is correct.
NOTE: INSTALLATION of SPRING RETAINERS
Place the notch on the outer circumference of the spring retainer toward this side and insert the retainer,
like pushing in, using a special tool. (Valve Spring Retainer)
Fig. 5-28
Fig. 5-29
Fig. 5-31
Thickness Gauge
(0.1mm
±
0.02)
Valve
Tappet
Intake, Exhaust Valve
Valve Spring
Spring Retainer
Front should be this side
(-) Driver
Valve Spring Retainer
Fig. 5-30
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