Valve Clearance: Testing and Inspection
INSPECTIONIn 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 starting, 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 in clockwise to align TDC identification notch (without paint mark) with timing indicator on front cover.
^ Make sure that both intake and exhaust cam noses of No. 1 cylinder (engine front side of left 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 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 with black arrow in figure).
NOTE: Firing order 1-8-7-3-6-5-4-2
^ No. 1 cylinder at compression TDC
c. Rotate crankshaft pulley clockwise (when view from engine front) by 270 degrees from the position of No. 1 cylinder compression TDC to align No. 3 cylinder at TDC of its compression stroke.
NOTE: Crankshaft pulley mounting bolt flange has a angle mark every 90 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 with white arrow in figure)
^ No. 3 cylinder at compression TDC
d. Rotate crankshaft pulley clockwise (when view from engine front) by 90 degrees from the position of No. 3 cylinder compression TDC to align No. 6 cylinder at TDC of its compression stroke.
^ By referring to the figure, measure the valve clearances at locations marked x as shown in the table.
^ No. 6 cylinder at compression TDC
3. Perform adjustment if the measured value is out of the standard.