Valve Seat Inspection/Repair

VALVE SEAT INSPECTION/REPAIR





1. Measure the seat contact width. If necessary, resurface the valve seat using a 45° valve seat cutter and/or resurface the valve face.
Standard width 0.8 - 1.4 mm (0.032 - 0.055 inch)





2. Verify that the valve seating position is at the center of the valve face.
^ If the seating position is too high, correct the valve seat using a 70° cutter, and a 45° cutter.
^ If the seating position is too low, correct the valve seat using a 45° cutter.





3. Inspect the sinking of the valve seat. Measure the protruding length (dimension L) of the valve stem. If the protruding length is not as specified, replace the cylinder head.
Standard dimension L
IN: 45.0 mm (1.772 inch)
EX: 45.0 mm (1.772 inch)
Maximum dimension L
IN: 45.6 mm (1.795 inch)
EX: 45.6 mm (1.795 inch)