Valve Clearance: Testing and Inspection
INSPECTIONPerform 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).
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 lobes of No. 1 cylinder face outside.
^ If they do not face outside, turn crankshaft pulley once more.
6. By referring to the figure (locations indicated with black arrow), measure valve clearances with a feeler gauge at locations marked X as shown.
^ No.1 cylinder compression TDC.
^ Use a feeler gauge to measure the 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 (locations indicated with black arrow), measure valve clearances with a feeler gauge at locations marked X as shown.
^ No.4 cylinder compression TDC.
9. If out of specifications, adjust as follows.