Valve Guide: Service and Repair

CAUTION: Always reface the valve seat after the valve guide has been reamed and use a suitable scraper to break the sharp corner (ID) at the top of the valve guide. Failure to do so may result in possible valve train wear and/or damage.





If it becomes necessary to ream a valve guide to install a valve with an oversize stem, a hand-reaming kit is available which contains the following reamer and pilot combinations: a 0.38 mm (0.015 inch) OS reamer with a 0.76 mm (0.03 inch) OS pilot, and a 0.76 mm (0.03 inch) reamer with a 0.38 mm (0.015 inch) OS pilot.

When replacing a standard size valve with an oversize valve, always use the reamer in sequence (smallest oversize first, and then next smallest and so forth) so reamers will not be overloaded.

NOTE: If oversize valve stems and oversize valve stem seal are not available, press out original guide and install service bushing. Ream ID for specified clearance for standard-size valve. Reface valve seat as required. Install standard-size valve stem seal.