Valve Seat Inspection/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.
Valve seat contact width (Standard) 1.2-1.6 mm (0.048-0.062 in)





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 35° (IN) cutter, and a 30° (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.
Valve protrusion height (Standard)
IN: 40.64-42.24 mm (1.600-1.662 in)
EX: 40.50-42.10 mm (1.595-1.657 in)