Spark

Valve Stem and Valve Guide Clearance Inspection

1. Inspect the valve for damage from the head to tip for the following conditions:

•	Pitting in the valve seat area (1)

•	Lack of valve margin (2)

•	Bending in the valve stem (3)

•	Pitting or excessive wear in the stem (4)

•	Worn valve key grooves (5)

•	Worn valve tip (6)

2. Replace the valve if any of these conditions exist.

Note: Valve guide is not removable. Replace the cylinder head if it is out of specification.

3. Measure the valve stem diameter (1) and valve guide inside diameter. If it is out of specification, replace it. Refer to Engine Mechanical Specifications .