MPV LX 4WD V6-3.0L SOHC (1997)
Valve Seat: Testing and Inspection
1. Inspect the contact surface of the valve seat and valve face for the following:
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Roughness
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Damage
2. If necessary, resurface the valve seat with a 45° valve seat cutter and/or resurface the valve face.
3. Apply a thin coat of Prussian blue to the valve face.
4. Check the valve seating by pressing the valve against the seat. If blue does not appear 360° around the valve seat, resurface the seat.
5. Measure the seat contact width.
Width: 1.2-1.6 mm (0.048-0.062 in)
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If the valve seating position on the valve face is too high, correct the valve seat with a 65° cutter.
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If the valve seating position on the valve face is too low, correct the valve seat with a 35° (IN) or 15° (EX) cutter.
6. Seat the valve to the valve seat with a lapping compound.
7. Check the sinking of the valve seat.
a. Measure the protruding length (dimension L) of the valve stem.
Dimension L
IN: 50.5 mm (1.988 in)
EX: 49.5 mm (1.949 in)