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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)
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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.
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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)