Service Manual — page 283 of 715

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ENGINE TOP END 5-33
Valves
Valve Seat Repair
• Repair the valve seat with the valve seat cutters [A].
  Special Tools - Valve Seat Cutter Holder Bar [B]: 57001
                     -1128
                  Valve Seat Cutter Holder, 4.5 [C]: 57001
                     -1330

    [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.
                         NOTICE
  Do not use a wire brush to remove the metal par-
  ticles from the cutter. It will take off the diamond
  particles.
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.
                              NOTE
  ○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
the following.
60° ........................... Cutter angle [B]
37.5 ....................... Outer diameter of cutter [C]