Valve Clearance: Testing and Inspection

INSPECTION





Perform inspection as follows after removal, installation or replacement of camshaft or valve-related parts, or if there is unusual engine conditions regarding valve clearance.
1. Remove RH and LH rocker covers with power tool.
2. Measure valve clearance as below:
a. Set No. 1 cylinder at TDC of its compression stroke.





^ Align crankshaft pulley timing mark (grooved line without color) with timing indicator.





^ Make sure No. 1 cylinder intake and exhaust cam nose is facing in direction shown in figure.
^ If not, rotate crankshaft pulley 360° clockwise (when viewed from front).








b. Using a feeler gauge, measure valve clearance.
Valve clearance standard:
Cold Intake: 0.26 - 0.34 mm (0.010 - 0.013 inch)
Exhaust: 0.29 - 0.37 mm (0.011 - 0.015 inch)
Hot* Intake: 0.304 - 0.416 mm (0.012 - 0.016 inch)
Exhaust: 0.308 - 0.432 mm (0.012 - 0.016 inch)
*: Approximately 80°C (176°F) (Reference data)








^ No. 1 cylinder at compression TDC





c. Rotate crankshaft by 240° clockwise (when viewed from front) to align No. 3 cylinder at TDC of its compression stroke.

NOTE: Crankshaft pulley mounting bolt flange has a stamped line every 60°. They can be used as a guide to rotation angle.





^ No. 3 cylinder at compression TDC








d. Turn crankshaft pulley clockwise by 240° from the position of No. 5 cylinder at compression TDC.








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

3. For measurements that are outside the specified range, perform adjustment below.