VALVE SEAT INSPECTION/REPAIR [WL-C, WE-C]

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

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Standard valve seat contact width

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 60° cutter, and then a 45° cutter.

2. If the seating position is too low, correct the valve seat using a 30° cutter, and a 45° cutter.

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Valve seat angle

IN: 45°

EX: 45°

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

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Standard valve recession

IN: 0.79—1.27 mm {0.039—0.050 in}

EX: 0.84—1.32 mm {0.033—0.051 in}

Maximum valve recession

IN: 1.68 mm {0.066 in}

EX: 1.73 mm {0.062 in}