Valve Guide - Clearance

VALVE GUIDE CLEARANCE
1. Measure valve deflection as shown in illustration. (Valve and valve guide mostly wear in this direction.)

Valve deflection limit (Dial gauge reading):
Intake & Exhaust...............0.2 mm (0.008 inch)

2. If it exceeds the limit, check valve to valve guide clearance.






a. Measure valve stem diameter and valve guide inner diameter.
b. Calculate valve to valve guide clearance.

Valve to valve guide clearance = valve guide inner diameter - valve stem diameter:
Standard
Intake................0.020 - 0.053 mm (0.0008 - 0.0021 inch)
Exhaust..............0.040 - 0.073 mm (0.0016 - 0.0029 inch)

Limit
Intake..............0.08 mm (0.0031 inch)
Exhaust...............0.1 mm (0.004 inch)

c. If it exceeds the limit, replace valve and remeasure clearance.
If clearance still exceeds the limit after replacing valve, replace valve guide.