11. If the valve seat contact area is too narrow and situated near the top of the valve face, use the 30° cutting tool to cut the
top edge of the valve seat. If necessary, use the 45° cutting tool to center the area of contact and set its width.
a - Previous contact width
12. If the valve seat contact area is too narrow and situated near the bottom of the valve face, use the 60° cutting tool to cut
the bottom edge of the valve seat. If necessary, use the 45° cutting tool to center the area of contact and set its width.
a - Previous contact width
Cylinder Head Assembly
IMPORTANT:
Reassemble the valve train components in their original location.
1. Lubricate the valve stems with 4‑Stroke 10W‑30 Outboard Oil. Install the valves, springs, new seals, upper seats, and
keepers.
a - Exhaust valve
b - Intake valve
c - Valve seat
d - Valve seal
e - Valve spring
f - Retainer
g - Keepers
Tube Ref No. Description Where Used Part No.
110
4-Stroke 10W-30
Outboard Oil
Valve stems 92-8M0078625
NOTE: The green valve seal is for the exhaust and the black valve seal is for the intake.
3200
a
b
c
d
e
f
g
Cylinder Head
90-8M0125265 eng NOVEMBER 2017 © 2018 Mercury Marine Page 4B-19
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