VALVE SEAT INSPECTION/REPAIR [WLT-1, WLT-2, WL-3]
id011097501300
1. Measure the seat contact width.
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• If it is not within the specification, resurface the valve seat using the 45°valve seat cutter.
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Standard valve seat contact width
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IN: 1.6—2.2 mm {0.063—0.086 in}
EX: 1.7—2.3 mm {0.067—0.090 in}
2. Verify that the valve seating position is at the center of the valve face.
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• If the seating position is too high, correct the valve seat using a 60° cutter, and then a 45° cutter.
• If the seating position is too low, correct the valve seat using a 37° (IN) or 30° (EX) cutter, and a 45° cutter.
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Valve seat angle
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IN: 45°
EX: 45°
3. Measure the receded amount from the cylinder head surface.
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• If it exceeds the maximum specification, replace the cylinder head.
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Standard valve recession
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IN: 0.61—1.09 mm {0.025—0.042 in}
EX: 0.71—1.19 mm {0.028—0.046 in}
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Maximum valve recession
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IN: 1.50 mm {0.059 in}
EX: 1.60 mm {0.063 in}
