Valve Seat Inspection/Repair

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Measure the seat contact width.
- If not as specified, resurface the valve seat using a 45° valve seat cutter and/or resurface the valve face.
  Standard Width
  
  IN: 1.1-1.4 mm {0.043-0.055 in}
  
  EX: 1.4-1.7 mm {0.056-0.066 in}
  
  Fig 1: Measuring Seat Contact Width
  Courtesy of MAZDA MOTORS CORP.
Verify that the valve seating position is at the center of the valve face.
- If the seating position is too high, correct the valve seat using a 70° cutter, and then 45° cutter.
- If the seating position is too low, correct the valve seat using 30° cutter, and then 45° cutter.
  
  Fig 2: Centering Valve Seating Position
  Courtesy of MAZDA MOTORS CORP.