E
ROCKER ARM AND VALVES
POWR
A
B
C
Valve seat refacing
NOTE:
After refacing the valve seat or replacing
the valve and valve guide, lap the valve
seat and valve face.
c
C
To prevent chatter marks, turn the valve
seat cutter with an even, downward pres-
sure (4 ~ 5 kg).
9
Refer to the following chart to deter-
mine the appropriate valve seat cut-
ter.
5-19
Valve seat cutter set:
YM-91043-C/90890-06803
Valve seat lapper:
N.A./90890-06805
Valve seat area
Valve cutter
A
0°
B
45°
C
60°
Valve seat cutting guidelines
1
The valve seat is centred on the valve face,
but is too wide.
Valve seat cutter set
Desired result
First:
Use
0° cutter
To reduce the
lightly
Second:
valve seat width.
60° cutter
1
2
The valve seat is in the middle of the valve
face, but is too narrow.
Valve seat cutter set
Desired result
To achieve a
Use
45° cutter
uniform valve
seat width.
2