Valve Cleaning and Inspection
WARNING: This page is about a different variant/trim than selected.
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NOTE:
Do not use a wire brush on any part of the valve stem.
NOTE:Do not grind or condition the intake valve. If the intake valve is out of specification, replace the valve.
Clean the valves of carbon, oil and varnish. Use a soft bristle wire brush to clean any carbon build-up from the valve head. Varnish can be removed by soaking in Parts Immersion Solvent. Refer to Adhesives, Fluids, Lubricants, and Sealers .
- Clean the valve guides.
- Inspect the valve stem for pitting or wear (4).
- Inspect the valve key groove for chipping or wear (5). Replace the valve if chipped or worn.
- Inspect the valve face for burning or cracking (1). If pieces are broken off, inspect the corresponding piston and cylinder head area for damage.
- Inspect the valve stem for burrs and scratches. Burrs and minor scratches may be removed with an oil stone.
- Inspect the valve stem for straightness (3) and the valve head for bending or distortion using V blocks. Bent or distorted valves must be replaced.
- Clean the deposits from the valve face. Inspect the valve face for grooving.
- Replace the valve if the face is grooved. Valve faces cannot be machined. If worn, or damaged, the valves must be replaced.
- Replace the valve if the valve head O.D. and chamfer (2) is worn or out of specification. Refer to Valve and Seat Grinding .
- The valves may be lightly lapped to the valve seats.
- Replace the valve if the valve tip (6) is worn.
- If no apparent wear, pitting, grooving, or distortion is present, perform the valve measurement and reconditioning procedure to verify valve specification. Refer to Valve and Seat Grinding .