POWR
Power unit
5-29
60C5D11
4. Measure the valve seat contact width
a
where the blueing dye is adhered to the
valve face. Reface the valve seat if the
valve is not seated properly or if the valve
seat contact width is out of specification.
Replace the valve guide if the valve seat
contact is uneven.
Refacing the valve seat
1. Reface the valve seat with the valve seat
cutter.
2. Cut the surface of the valve seat with a
45° cutter by turning the cutter clockwise
until the valve seat face has become
smooth.
a
Slag or rough surface
Valve seat contact width
a
:
Intake:
1.2–1.6 mm (0.047–0.063 in)
Exhaust:
1.2–1.6 mm (0.047–0.063 in)
Valve seat cutter holder:
90890-06553
Valve seat cutter:
30° (intake): 90890-06326
30° (exhaust): 90890-06328
45° (intake and exhaust):
90890-06555
60° (intake): 90890-06324
60° (exhaust): 90890-06315
S60C5540
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