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ENGINE 10 OVERHAUL Valve seat inserts - renew NOTE: Service valve seat inserts are 1. Remove worn valve seats. CAUTION: Take care not to damage 2. Heat cylinder head evenly to approximately 120 ° C (250 ° F). WARNING: Handle hot cylinder head with 3. Using a suitable mandrel, press new insert fully into counterbore. 4. Allow cylinder head to air cool. Valve seats and seat inserts - refacing CAUTION: Renew worn valve guides and 1. Check condition of valve seats and valves that are to be re-used. 2. Remove carbon from valve seats. 3. Reface valves as necessary. If a valve has to be ground to a knife-edge to obtain a true seat, ° |