Mercury 40 Service Manual page 231

Condition: Valve seat is too narrow and is located near the bottom edge of the valve face.
Use
Cylinder Head Reassembly
Valve Installation
INTAKE AND EXHAUST VALVE COMPONENTS
a -
b -
c -
d -
e -
90-828631R3 MARCH 1999
Valve Seat Cutter Set
60 Cutter, First
45 Cutter
b
a
Valve
Spring Seat
Valve Seal
Valve Spring
Spring Retainer
f - Valve Keepers
55802
Desired Results
To center the seat and to in-
crease its Width crease its Width
f
e
d
c
CYLINDER HEAD
Page 4A-35