Mercury 50

CYLINDER HEAD
Page 4A-34 90-828631R3 MARCH 1999
Valve Refacing Steps
Condition: The valve seat is centered on valve face but it is too wide.
55799
Valve Seat Cutter Set Desired Results
Use
Li htl
15° Cutter
To reduce valve seat width
Li
g
htl
y
60° Cutter
Condition: The valve seat is in the middle of the valve face but it is too narrow.
55800
Valve Seat Cutter Set Desired Results
Use 45° Cutter To achieve a uniform valve
t idth
sea
t
w
idth
Condition: Valve seat is too narrow and it is near valve margin.
55801
Valve Seat Cutter Set Desired Results
Use
15° Cutter, First
To center the seat and to
hi it idth
45° Cutter
ac
hi
eve
it
s w
idth