Valve Clearance: Testing and Inspection

Valve Clearance

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.
1. Remove rocker cover.
2. Measure the valve clearance with the following procedure:
a. Set No. 1 cylinder at TDC of its compression stroke.
^ Rotate crankshaft pulley (1) clockwise and align TDC mark (no paint) (B) to timing indicator (A) on front cover.





C: White paint mark (Not use for service)





^ At the same time, make sure that both intake and exhaust cam noses of No. 1 cylinder face inside (<-) as shown.
1: Camshaft (INT)
2: Camshaft (EXH)
<-: Engine front
^ If they do not face inside, rotate crankshaft pulley once more (360 degrees) and align as shown.





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 with black arrow (<-)] with a feeler gauge.
^ No. 1 cylinder compression TDC
A: Exhaust side
B: No.1 cylinder
C: No.2 cylinder
D: No.3 cylinder
E: No.4 cylinder
F: Intake side
<-: Engine front
c. Set No.4 cylinder at TDC of its compression stroke.





^ Rotate crankshaft pulley (1) one revolution (360 degrees) and align TDC mark (no paint) (B) to timing indicator (A) on front cover.
C: White paint mark (Not use for service)








^ By referring to the figure, measure the valve clearance at locations marked "x" as shown in the table [locations indicated with black arrow (<-)] with a feeler gauge.
^ No. 4 cylinder compression TDC
A: Exhaust side
B: No.1 cylinder
C: No.2 cylinder
D: No.3 cylinder
E: No.4 cylinder
F: Intake side
<-: Engine front
3. If out of standard, perform adjustment.