Valve Clearance: Adjustments

Valve Clearance Adjustment

Measurement

1. Remove the valve rocker arm cover. Refer to Valve Rocker Arm Cover Replacement (Service and Repair).




2. Rotate the crankshaft pulley clockwise, aligning the notches (1) between the pulley and the cover.




3. Measure the valve clearance at positions (2) and (6). Rotate the crankshaft pulley clockwise 180 degrees.
4. Measure the valve clearance at positions (3) and (7). Rotate the crankshaft pulley clockwise 180 degrees.
5. Measure the valve clearance at positions (4) and (8). Rotate the crankshaft pulley clockwise 180 degrees.
6. Measure the valve clearance at positions (1) and (5). Rotate the crankshaft pulley clockwise 180 degrees.
7. If the measured values are not within specifications, replace the valve tappets.

* Intake Side: 0.21-0.29 mm (Nominal Value: 0.25 mm)
* Exhaust Side: 0.27-0.35 mm (Nominal Value: 0.30 mm)

8. Determine the tappet size. Refer to Determining Replacement Tappet Size.
9. Replace the valve tappets if necessary. Refer to Cylinder Head Disassemble (6. Cylinder Head Disassemble).

Determine Replacement Tappet Size




1. Remove the old tappet.
2. Locate the ID number inside old tappet.
3. Locate the ID number in the following table and record the value.
4. Perform the following calculation to determine the replacement tappet size.
Value of removed tappet + measured clearance - nominal value = new tappet size
Example:

* ID of old tappet = 20 = 3.20 mm, clearance was 0.31 mm, nominal value is 0.25 mm
* 3.20 mm + 0.31 mm - 0.25 mm = 3.265 mm
* 3.265 mm = 27X (ID number) = 55353766 (part number)