Valve Clearance: Testing and Inspection

INSPECTION
Perform this inspection as follows after removal, installation, or replacement of the camshaft or any valve related parts, or if there are any unusual engine conditions due to changes in valve clearance over time (starting, idling, and/or noise). Refer to Camshaft, Lifters and Push Rods; Camshaft, Engine; Service and Repair.

1. Warm up the engine, then stop it.
2. Remove front RH engine under cover using power tool.
3. Remove the rocker cover using power tool.





4. Turn crankshaft pulley in normal direction (clockwise when viewed from front) to align TDC identification mark (without paint mark) with timing indicator.





5. At this time, check that the both intake and exhaust cam noses of No. 1 cylinder face outside.
^ If they do not face outside, turn crankshaft pulley once more.





6. By referring to the figure, measure valve clearances at locations marked X as shown in the table below (locations indicated with black arrow in figure above) with a feeler gauge.





Table

^ No. 1 cylinder compression TDC.





^ Use a feeler gauge, measure clearance between valve and camshaft.
Valve clearance standard:
Hot
Intake: 0.32 - 0.40 mm (0.013 - 0.016 inch)
Exhaust: 0.33 - 0.41 mm (0.013 - 0.016 inch)
Cold*
Intake: 0.24 - 0.32 mm (0.009 - 0.013 inch)
Exhaust: 0.26 - 0.34 mm (0.010 - 0.013 inch)
* Reference data at approximately 20°C (68°F)

CAUTION: If inspection was carried out with cold engine, check that values with fully warmed up engine are still within specifications.

7. Turn crankshaft one complete revolution (360°) and align mark on crankshaft pulley with pointer.





8. By referring to the figure, measure valve clearances at locations marked X as shown in the table below (locations indicated with black arrow in figure above).





Table

^ No.4 cylinder compression TDC.
9. If out of specifications, adjust. Refer to Cylinder Head Assembly; Valve Clearance; Adjustments.