Valve Clearance: Testing and Inspection
INSPECTIONPerform 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:
<---: Engine front
1. Remove rocker covers (bank 1 and bank 2).
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.
<---: Timing mark (grooved line without color)
^ Check that intake and exhaust cam nose on No. 1 cylinder (engine front side of bank 1) are located as shown in the figure.
<---: Engine front
^ 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: Refer to EM-140, "Camshaft". Service Limits and General Specifications
^ By referring to the figure, measure the valve clearances at locations marked "x" as shown in the table below (locations indicated in the figure).
<---: Engine front
^ No. 1 cylinder at compression TDC
c. Rotate crankshaft 240° clockwise (when viewed from engine front) to align No. 3 cylinder at TDC its compression stroke.
NOTE:
Mark a position 240° (b) from a corner of the hexagonal part of crankshaft pulley mounting bolt as shown in the figure. Use the hexagonal part as a guide.
1: Crankshaft pulley
A: Paint mark
^ By referring to the figure, measure the valve clearances at locations marked "x" as shown in the table below (locations indicated in the figure).
<---: Engine front
^ No. 3 cylinder at compression TDC
d. Rotate crankshaft 240° clockwise (when viewed from engine front) to align No. 5 cylinder at TDC of compression stroke.
NOTE:
Mark a position 240° (b) from a corner of the hexagonal part of crankshaft pulley mounting bolt as shown in the figure. Use the hexagonal part as a guide.
1: Crankshaft pulley
A: Paint mark
^ By referring to the figure, measure the valve clearances at locations marked "x" as shown in the table below (locations indicated in the figure).
<---: Engine front
^ No. 5 cylinder at compression TDC
3. Perform adjustment if the measured value is out of the standard. Refer to "ADJUSTMENT".