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VALVE SEAT INSPECTION/REPAIR

BME011010102601

1. Measure the seat contact width. If necessary, resurface the valve seat using a 45° valve seat cutter or resurface the valve face or both.

Standard width

  IN: 1.3-1.9 mm {0.052-0.074 in}
  EX: 1.3-1.9 mm {0.052-0.074 in}

2. Verify that the valve seating position is at the center of the valve face.

  (1) If the seating position is too high, correct the valve seat using a 65° (IN) or 75° (EX) cutter, and a 45° cutter.
  (2) If the seating position is too low, correct the valve seat using a 30° cutter, and a 45° cutter.

3. Measure the receded amount from the cylinder head surface. If it exceeds the maximum, replace the cylinder head.

Standard recession

  IN: 0.42-0.90 mm {0.017-0.035 in}
  EX: 0.46-0.94 mm {0.019-0.037 in}

Maximum recession

  IN: 1.25 mm {0.049 in}
  EX: 1.29 mm {0.051 in}