Valve Clearance: Adjustments

Valve Clearance Check

WARNING: Before beginning any service procedure, REFER to Safety Warnings . Failure to follow this instruction may result in serious personal injury.

General Procedure

1. Remove the valve cover. REFER to Valve Cover .

2. NOTE: Engine must be at room temperature before measuring. The valve clearance must be measured with the camshaft at base circle. The engine will have to be rotated with the crankshaft pulley bolt to bring each valve to base circle.
Use a feeler gauge to measure the clearance of each valve and record its location. A midrange clearance is the most desirable:

- Intake: 0.23 mm (0.0091 in) - 0.33 mm (0.0130 in)
- Exhaust: 0.31 mm (0.0122 in) - 0.41 mm (0.0161 in)






3. NOTE: The number on the valve tappet reflects the thickness of the valve tappet. For example, a tappet with the number 3.310 has the thickness of 3.31 mm (0.1303 in).
If any of the valve clearances are out of specification, select new tappets using this formula: tappet thickness = measured clearance + the base tappet thickness - most desirable thickness. Select the tappets and mark the installation location.

4. If required, install the new selected valve tappets in the marked locations. REFER to Valve Tappets .