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.








^ 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.