Checking The Rocker Arm And Rocker Arm Shaft - SELVA MARINE Pike 9,9 Service Manual

8. If the valve seat contact area is too nar-
row and situated near the top edge of the
valve face, use a 30° cutter to cut the top
edge of the valve seat, and then use a
45° cutter to center the area and set its
width.
30˚
b
b Previous contact width
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
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.
6AU3K11
S6AG5J40J
60˚
S6AG5J50J
S6AU5103
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" (5-31).
Checking the rocker arm and rocker
arm shaft
1. Check the rocker arms, rocker arm shaft,
and contact surface a of each rocker
arm. Replace if worn.
2. Measure the rocker arm inside diameter
b and rocker arm shaft outside diameter
c. Replace if out of specification.
c
a
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)
Cylinder head
1
2
3
4
5
5
6
b
7
S6AU5104
8
9
5-34