ENGINE
INSPECTION AND REPAIR
4-27
4. Grind:
• Valve seat
Use 30°, 45° and 60° valve grinders
1
.
Establish an 1.0 mm
wide uniform seat
45°
Desired result
Milling cutter
B The seat is centered but thin.
Valve seat grinding steps
************************************
CAUTION:
When turning the milling cutter, keep a
4~5 kg pressure.
Valve seat milling cutter:
YM - 91043
Section
A
B
C
Cutting
30°
45°
60°
Mill the seat as follows:
R e d u c e t h e s e a t
width to 1.0 mm
30°
60°
Desired result
Milling cutter
A The valve face indicates that the seat
is centered but too wide.
A
B
