Valve Clearance: Testing and Inspection

INSPECTION





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 banks).
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 noses on No. 1 cylinder (engine front side of right bank) are located as shown.
^ If not, rotate crankshaft one revolution (360°) and align as shown.





b. Use 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 (locations indicated in the figure) with feeler gauge.
^ 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: Crankshaft pulley bolt flange has a stamped line every 60°. 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) with feeler gauge.
^ 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.








^ By referring to the figure, measure the valve clearances at locations marked "x" as shown in the table (locations indicated in the figure) with feeler gauge.
^ No. 5 cylinder at compression TDC
3. For the measured value out of the standard, perform adjustment. Refer to EM-87, "ADJUSTMENT". Adjustments