Valve seat refacing
NOTE:
After refacing the valve seat or replacing
the valve and valve guide, lap the valve
seat and valve face.
cC
To prevent chatter marks, turn the valve
seat cutter with an even, downward pres-
sure (4 ~ 5 kg).
9Refer 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
A0°
B45°
C60°
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
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