Valve Clearance: Testing and Inspection

Valve Clearance

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.

In cases of removing/installing or replacing camshaft and valve related parts, or of unusual engine conditions due to changes in valve clearance (found malfunctions during stating, idling or causing noise), perform inspection as follows:

1. Remove rocker covers (right and left bank).
2. Measure the valve clearance as follows:





a. Set No. 1 cylinder at TDC of its compression stroke.
^ Rotate crankshaft pulley clockwise to align timing mark (grooved line without color) with timing indicator.





^ Make sure that intake and exhaust cam nose on No. 1 cylinder (engine front side of right bank) are located as shown in the figure.
^ If not, turn crankshaft one revolution (360 degrees) and align as shown in the figure.





b. Use a feeler gauge, measure the clearance between valve lifter and camshaft.





Valve clearance:





^ By referring to the figure, measure the valve clearances at locations marked "x" as shown in the table below (locations indicated in the figure).





^ No. 1 cylinder at compression TDC





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

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








^ By referring to the figure, measure the valve clearances at locations marked "x" as shown in the table below (locations indicated in the figure).
^ No. 3 cylinder at compression TDC





d. Rotate crankshaft by 240 degrees clockwise (when viewed from engine front) to align No. 5 cylinder at TDC of compression stroke.








^ By referring to the figure, measure the valve clearances at locations marked "x" as shown in the table below (locations indicated in the figure).
^ No. 5 cylinder at compression TDC
3. For measured value are out of the standard, perform adjustment.