Valve Seat Inspection/Repair

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Measure the seat contact width.
- If not within the specification, resurface the valve seat using a 45° valve seat cutter and/or resurface the valve face.
Standard Width
1. 1.2-1.6 mm {0.048-0.062 in}
Verify that the valve seating position is at the center of the valve face.
1. If the seating position is too out side, correct the valve seat using a 70° (IN) or 65° (EX) cutter, and a 45° cutter.
2. If the seating position is too inner side, correct the valve seat using a 30° (IN) cutter, and a 0° (EX) cutter, and a 45° cutter.
  
  Fig 2: Centering Valve Seating Position
  Courtesy of MAZDA MOTORS CORP.
Inspect the sinking of the valve seat. Measure the protruding length (dimension L) of the valve stem.
- If not specified, replace the cylinder head.
Standard Dimension L
1. IN: 40.64-42.24 mm {1.600-1.662 in}
2. EX: 40.50-42.10 mm {1.595-1.657 in}
  
  Fig 3: Measuring Valve Stem Protruding Length
  Courtesy of MAZDA MOTORS CORP.