Valve

Valve - Stem Diameter





1. Measure the diameter of each intake and exhaust valve stem at the points shown. Verify the diameter is within specification.
^ If out of specification, install new components as necessary.

Valve Stem to Valve Guide Clearance

Special Tool(s):

NOTE: Valve stem diameter must be within specifications before checking valve stem to valve guide clearance.

1. NOTE: If necessary, use a magnetic base.





Install a Valve Guide Clearance Gauge on the valve stem and install a Dial Indicator Gauge with Holding Fixture. Lower the valve until the Valve Guide Clearance Gauge contacts the upper surface of the valve guide.
2. Move the Valve Guide Clearance Gauge toward the indicator and zero the indicator. Move the Valve Guide Clearance Gauge away from the indicator and note the reading. The reading will be DOUBLE the valve stem-to-valve guide clearance. Valves with oversize stems will need to be installed if out of specification.

Valve - Inspection





1. Inspect these valve areas:
1 The end of the stem for grooves or scoring.
2 The valve face and the edge for pits, grooves or scores.
3 The valve head for signs of burning, erosion, warpage and cracking.
4 The valve margin for wear.