Refacing The Valve Seat - SELVA MARINE Wahoo 15 Service Manual

POWR
3. Press the valve slowly against the valve
seat with a valve lapper as shown.
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.
Check the valve guide if the valve seat
contact is uneven.
Valve seat contact width a:
Intake and exhaust:
1.2–1.6 mm (0.047–0.063 in)
5-41
Power unit
S6AG5200

Refacing the valve seat

1. Reface the valve seat with the valve seat
cutters.
Valve seat cutter holder:
90890-06316
Valve seat cutter:
30° (intake): 90890-06818
30° (exhaust): 90890-06819
45° (intake): 90890-06555
45° (exhaust): 90890-06312
60° (intake): 90890-06323
60° (exhaust): 90890-06315
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.
45˚
a Slag or rough surface
5
S6AG5210
a
S6AG5J20J
6AG3J11