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°) 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 "" as shown in the table (locations indicated in the figure).
^ No. 1 cylinder at compression TDC
c. Rotate crankshaft by 240° clockwise (when viewed from engine front) to align No. 3 cylinder at TDC of its compression stroke.

NOTE:





^ To align cylinder No.3 with the compression top dead center, place matching marks (A) on the crankshaft pulley (1) side and on the cylinder block side at a point 240° counterclockwise from the compression top dead center using the hex head of the crankshaft pulley bolt as a guide.








^ By referring to the figure, measure the valve clearances at locations marked "x" as shown in the table (locations indicated in the figure).
^ No. 3 cylinder at compression TDC
d. Rotate crankshaft by 240° clockwise (when viewed from engine front) to align No. 5 cylinder at TDC of compression stroke.

NOTE:





^ To align cylinder No.5 with the compression top dead center, place matching marks (A) on the crankshaft pulley (1) side and on the cylinder block side at a point 240° counterclockwise from the compression top dead center using the hex head of the crankshaft pulley bolt as a guide.








^ By referring to the figure, measure the valve clearances at locations marked "x" as shown in the table (locations indicated in the figure).
^ No. 5 cylinder at compression TDC

3. Perform adjustment if the measured value is out of the standard.