Valve Clearance: Adjustments
VALVE ADJUSTINGCAUTION: Adjust valve clearance while engine is cold.
NOTE:
^ Perform adjustment by selecting the correct head thickness of the valve lifter (adjusting shims are not used).
^ The specified valve lifter thickness is the dimension at normal temperatures. Ignore dimensional differences caused by temperature. Use specifications for hot engine condition to confirm valve clearances.
1. Remove the camshaft. Refer to "REMOVAL".
2. Remove the valve lifter that was measured as being outside the standard specifications.
3. Measure the center thickness of the removed lifter with a micrometer as shown.
4. Use the equation below to calculate the replacement valve lifter thickness.
Valve lifter thickness calculation equation: t = t1 + (C1 - C2) t = thickness of the replacement lifter t1 = thickness of the removed lifter C1 = measured valve clearance C2 = standard valve clearance
^ The thickness of the new valve lifter can be identified by the stamp mark on the reverse side (inside the lifter).
^ Available thickness of the valve lifter (factory setting):
7.88 - 8.40 mm (0.3102 - 0.3307 inch), in 0.02 mm (0.0008 inch) increments, in 27 sizes (intake / exhaust). Refer to "Valve Lifter".
NOTE: Two types of stamp marks are used for parallel setting and for manufacturer identification.
Value lifter thickness
Intake : 0.30 mm (0.012 inch)
Exhaust : 0.33 mm (0.013 inch)
5. Install the selected replacement valve lifter.
6. Install the camshaft. Refer to "INSTALLATION".
7. Rotate the crankshaft a few turns by hand.
8. Confirm that the valve clearances are within specification.
9. After the engine has been run to full operating temperature, confirm that the valve clearances are within specification.