Valve Guide Inspection/Repair

VALVE GUIDE INSPECTION / REPAIR
Valve Guide Inspection





1. Measure the inner diameter of the valve guides in two directions where indicated. Verify the diameter is within specification.
2. If the valve guide is not within specifications, ream the valve guide and install a valve with an oversize stem or remove the valve guide and install a new valve guide.

Valve Guide 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) left by the reamer at the top of the valve guide.
^ The interference angle of the valve and seat should not be lapped out. Remove grooves or score marks from the end of the valve stem, and chamfer it as necessary. Do not remove more than 0.254 mm (0.010 inch) from the end of the valve stem.

Note:
^ If oversize valve stems and oversize stem seals are not available, bore 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.





1. Use a hand-reaming kit to ream the valve guide.
2. Reface the valve seat.
3. Clean the sharp edges of the valve guide inner diameter left by reaming.