Checking The Rocker Arm And Rocker Arm Shaft; Checking The Camshaft - SELVA MARINE Wahoo 15 Service Manual

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9. If the valve seat contact area is too nar-
row and situated near the bottom edge of
the valve face, use a 60° cutter to cut the
bottom edge of the valve seat, and then
use a 45° cutter to center the area and
set its width.
b Previous contact width
10. After refacing the valve seat to the speci-
fied contact width, apply a thin, even
layer of lapping compound onto the valve
seat, and then lap the valve using a valve
lapper.
CAUTION:
Do not get the lapping compound on the
valve stem and valve guide.
11. After every lapping procedure, be sure to
clean off any remaining lapping com-
pound from the cylinder head and the
valve.
12. Check the valve seat contact area of the
valve again.
NOTE:
To check the valve seat contact area, see
"Checking the valve seat" (5-40).
5-43
Power unit
b
60˚
S6AG5J50J
S6AG5220
Checking the rocker arm and rocker
arm shaft
1. Check the rocker arms, rocker arm shaft,
and rocker arm contact surface a.
Replace if worn.
2. Measure the rocker arm inside diameter
b and rocker arm shaft outside diameter
c. Replace if out of specification.
a
b
Rocker arm inside diameter b:
13.000–13.018 mm
(0.5118–0.5125 in)
Rocker arm shaft outside
diameter c:
12.941–12.951 mm
(0.5095–0.5099 in)

Checking the camshaft

1. Measure the cam lobe. Replace if out of
specification.
c
S6AG5230
6AG3J11
5
5