Cylinder Head Valves Clean and Inspect

IMPORTANT: Do not scratch the valve stem with the wire brush.





1. Clean valves of carbon, oil and varnish. Carbon can be removed with a wire brush, varnish can be removed by soaking in Parts Immersion Solvent or equivalent.
2. Clean valve guides.
3. Inspect valve stem for wear. The valve stem end may he reconditioned by grinding.
4. Follow grinder manufacturer's instructions. Ensure the new surface is perpendicular to valve stem.
5. Inspect valve keeper groove for chipping or wear. Replace valve if chipped or worn.
6. Inspect valve face for burning or cracking. If pieces are broken off, inspect corresponding piston and cylinder head area for damage.
7. Inspect valve stem for burrs and scratches. Burrs and minor scratches may be removed with an oil stone.
8. Inspect valve stem for straightness and the valve head for bending or distortion. Use V blocks. Bent or distorted valves must be replaced.
9. Clean all deposits from valve face. Inspect valve face for grooving.
10. Replace valve if the face is grooved.

IMPORTANT: Valve faces cannot be machined. If worn, or damaged, the valves must be replaced.

Valves may be lightly lapped to the valve seats.