Valve Clearance: Adjustments

ADJUSTMENT
^ Perform adjustment depending on selected head thickness of valve lifter.

1. Measure the valve clearance. Refer to "INSPECTION".
2. Remove camshaft.
3. Remove valve lifters at the locations that are out of the standard.





4. Measure the center thickness of the removed valve lifters with a micrometer (A).
5. Use the equation below to calculate valve lifter thickness for replacement.
Valve lifter thickness calculation: t = t1 + (C1 - C2)
t = Valve lifter thickness to be replaced
t1 = Removed valve lifter thickness
C1 = Measured valve clearance
C2 = Standard valve clearance:
Intake: 0.30 mm (0.012 in)
Exhaust: 0.33 mm (0.013 in)





^ Thickness of new valve lifter can be identified by stamp marks on the reverse side (inside the cylinder). Stamp mark 788 indicates 7.88 mm (0.3102 in) in thickness.
A: Stamp
B: Thickness of valve lifter
Available thickness of valve lifter: 27 sizes with range 7.88 to 8.40 mm (0.3102 to 0.3307 in) in steps of 0.02 mm (0.0008 in) (when manufactured at factory).
6. Install selected valve lifter.
7. Install camshaft.
8. Manually turn crankshaft pulley a few turns.
9. Check that the valve clearances for cold engine are within the specifications by referring to the specified values. Refer to EM-18, "Inspection and Adjustment". Testing and Inspection
10. Install all removal parts in the reverse order of removal.
11. Warm up the engine, and check for unusual noise and vibration.