Valve Seat Repair
Repair the valve seat with the valve seat cutters [A].
Special Tools - Valve Seat Cutter Holder Bar [B]: 57001
Valve Seat Cutter Holder,
[For Exhaust Valve Seat]
Valve Seat Cutter, 45° - 27.5: 57001-1114
Valve Seat Cutter, 32° - 28: 57001-1119
Valve Seat Cutter, 60° - 27: 57001-1409
[For Intake Valve Seat]
Valve Seat Cutter, 45° - 32: 57001-1115
Valve Seat Cutter, 32° - 33: 57001-1199
Valve Seat Cutter, 60° - 33: 57001-1334
If the manufacturer's instructions are not available, use
the following procedure.
Seat Cutter Operation Care
1. This valve seat cutter is developed to grind the valve for
repair. Therefore the cutter must not be used for other
purposes than seat repair.
2. Do not drop or shock the valve seat cutter, or the dia-
mond particles may fall off.
3. Do not fail to apply engine oil to the valve seat cutter
before grinding the seat surface. Also wash off ground
particles sticking to the cutter with washing oil.
Do not use a wire brush to remove the metal par-
ticles from the cutter. It will take off the diamond
4. Setting the valve seat cutter holder in position, operate
the cutter in one hand. Do not apply too much force to
the diamond portion.
Prior to grinding, apply engine oil to the cutter and dur-
ing the operation, wash off any ground particles sticking
to the cutter with washing oil.
5. After use, wash it with washing oil and apply thin layer
of engine oil before storing.
Marks Stamped on the Cutter
The marks stamped on the back of the cutter [A] represent
60° ........................... Cutter angle [B]
....................... Outer diameter of cutter [C]
4.5 [C]: 57001
ENGINE TOP END 5-33