Valve: Service and Repair

REPLACEMENT
VALVE SEAT RING





1. Cut away the inner face of the valve seat to reduce the wall thickness.
2. Enlarge the cylinder head hole so that matches the specified cylinder head hole inner diameter of new valve seat ring.
3. Heat the cylinder head to about 250°C (480°F) and press-fit an oversize seat ring for the cylinder head hole size.
4. Using lapping compound, lap the valve to the new seat.
Valve seat contact width 0.0382 - 0.0618 inch (0.97 - 1.57 mm)





VALVE SEAT RING OVERSIZE

VALVE GUIDE





1. Using the special tool (09221-FD100(A)), withdraw the old valve guide toward the bottom of cylinder head.
2. Recondition the cylinder head hole so that it can match the newly press-fitted oversize valve guide.





3. Using the special tool (09221-FD100(A),(B)), press-fit the valve guide. The valve guide must be press-fitted from the upper side of the cylinder head.

NOTE: Do not install a valve guide unless it is oversize.

4. After the valve guide is press-fitted, insert a new valve and check for proper stem-to-guide clearance.
5. After the valve guide is replaced, check that the valve is seated properly. Recondition the valve seats as necessary





VALVE GUIDE OVERSIZE (160OCC)