2-20 PERIODIC MAINTENANCE
Valve Clearance Measuring Position #1 Piston
TDC at End of Compression Stroke Intake
valve clearances of #1 piston,and Exhaust valve
clearances of #1 piston
NOTE
O Check the valve clearance using this method only.
Checking the clearance at any other cam position
may result in improper valve clearance.
Valve Clearance Measuring Position #2 Piston
TDC at End of Compression Stroke Intake valve
clearances of #2 piston,and Exhaust valve
clearances of #2 piston
If the valve clearance is not within the specified
range,first record the clearance,and adjust it.
Valve Clearance Adjustment
To change the valve clearance,remove the cam
shaft chain tensioner,camshafts and valve lifters.
Replace the shim with one of a different thickness.
NOTE
O Mark and record the valve lifter and shim location
so they can be reinstalled in their original positions.
O If there is no clearance,select a shim which is sev-
eral sizes smaller and then measure the clearance.
To select a new shim which brings the valve
clearance within the specified range, refer to the
Valve Clearance Adjustment Charts.
Apply a thin coat of molybdenum disulfide grease
to the valve lifters.
Install the camshafts. Be sure to time the cam
shafts properly (see Camshaft Installation in the
Engine Top End chapter).
Remeasure any valve clearance that wasadjusted.
Readjust if necessary.
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