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. 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 (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 (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 (locations indicated in the figure).
^ No. 5 cylinder at compression TDC

3. For measured value are out of the standard, perform adjustment. Refer to EM-88, "ADJUSTMENT". Adjustments