Valve seats, refacing: Notes

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Special tools and equipment:

Depth gauge
Valve lapping tool
NOTE:
- Repairing engines with leaking valves, especially engines with high mileage must include measuring valve guides. See VALVE GUIDES, CHECKING .
- Before refacing, calculate maximum permissible refacing dimension.
- If the maximum permissible refacing dimension is exceeded, the function of the hydraulic valve lifters can no longer be guaranteed and the cylinder head must be replaced.
- Reface valve seats just enough to produce a good seating pattern.