Valve Guide: Service and Repair

CAUTION: Always reface the valve seat after the valve guide has been reamed. Use a suitable scraper to break the sharp ID at the top of the valve guide.

If it becomes necessary to ream a valve guide and install a valve with an oversize stem, a reaming kit is available containing the following reamer and pilot combinations: 0.38mm (0.015 inch), Oversize (OS) reamer with 0.076mm (0.003 inch) OS pilot and a 0.76mm (0.030 inch) reamer with a 0.38mm (0.015 inch) OS pilot.

When replacing a standard size valve with an oversize valve, always use the reamers in sequence (smallest oversize first). This will prevent overloading the reamers.