Valve Seat: Service and Repair

VALVE SEAT INSPECTION/REPAIR





1. Measure the seat contact width.
- If not within the specification, resurface the valve seat using a 45° valve seat cutter and/ or resurface the valve face.
Standard width 1.2 - 1.6 mm {0.048 - 0.062 inch}





2. Verify that the valve seating position is at the center of the valve face.
1 If the seating position is too out side, correct the valve seat using a 70° (IN) or 65° (EX) cutter, and a 45° cutter. (2) If the seating position is too inner side, correct the valve seat using a 30° (IN) cutter, and a 0° (EX) cutter, and a 45° cutter.





3. Inspect the sinking of the valve seat. Measure the protruding length (dimension L) of the valve stem.
- If not specified, replace the cylinder head.
Standard dimension L
IN: 40.64 - 42.24 mm {1.600 - 1.662 inch}
EX: 40.50 - 42.10 mm {1.595 - 1.657 inch}