Valve Clearance: Testing and Inspection

CAMSHAFT


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. Component Removal And Installation.
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 (Black Arrow) as shown.






- 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 below [locations indicated with black arrow (Black Arrow)] with a feeler gauge.
- No. 1 cylinder compression TDC











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 below [locations indicated with black arrow (Black Arrow)] with a feeler gauge.
- No. 4 cylinder compression TDC










3. If out of standard, perform adjustment.

ADJUSTMENT
- Perform adjustment depending on selected head thickness of valve lifter.
1. Remove camshaft. Removal And Installation.
2. Remove valve lifters at the locations that are out of the standard.





3. Measure the center thickness of the removed valve lifters with a micrometer (A).
4. Use the equation below to calculate valve lifter thickness for replacement.










- Thickness of new valve lifter (B) can be identified by stamp mark (A) on the reverse side (inside the cylinder).
Stamp mark "302" indicates 3.02 mm (0.1189 in) in thickness.

NOTE:
Available thickness of valve lifter: 26 sizes range 3.00 to 3.50 mm (0.1181 to 0.1378 in) in steps of 0.02 mm (0.0008 in) (when manufactured at factory). Mechanical Specifications.
5. Install the selected valve lifter.
6. Install camshaft. Removal And Installation.
7. Install timing chain and related parts. Component.
8. Manually rotate crankshaft pulley a few rotations.
9. Make sure that the valve clearances are within the standard.
10. Installation of the remaining components is in the reverse order of removal.