Valve Clearance

Warm engine to normal operating temperature. Remove valve cover and spark plugs. Rotate crankshaft to bring piston No. 1 to TDC on compression stroke. Pointer should be aligned with TDC mark on crankshaft pulley and cylinder No. 1 lifters should be loose. If not, rotate crankshaft 360° and align as described.
Measure valve clearance for valves as specified in the VALVE IDENTIFICATION table. Verify valve clearance is as specified in the VALVE CLEARANCE ADJUSTMENT table. Rotate crankshaft 360° and repeat procedure. Record valve clearance measurements that are not within specifications.
Adjust valve clearance as required. Rotate crankshaft to position cam lobe upward for valve to be adjusted. Remove adjusting shim. Measure thickness of shim being removed. Determine new shim size for intake valves by subtracting .0146 inch (.37 mm) from measured valve clearance and adding the result to the measured thickness of the removed shim. Determine new shim size for exhaust valves by subtracting .0157 inch (.40 mm) from measured valve clearance and adding the result to the measured thickness of the removed shim.
Select a new shim closest in size to that required. Shims are available in 50 sizes ranging from .0787 inch (2.00 mm) to .1173 inch (2.98 mm) in .0008 inch (.02 mm) increments. Install new shim with surface on which thickness is stamped facing down.

VALVE IDENTIFICATION

Cylinder At TDC	Intake Valve	Exhaust Valve
1	1 & 2	1 & 3
3	4 & 4	2 & 4

VALVE CLEARANCE ADJUSTMENT