VALVE SEAT INSPECTION/REPAIR [MZR-CD 2.2]

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1. Measure the contact width of the valve face and the valve seat using the valve lapping compound.

• 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

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 60° (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.

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3. Measure the receded amount from the cylinder head surface.

• If it exceeds the maximum specification, replace the cylinder head.

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Standard valve seat recession

IN : 0.92—1.40 mm {0.037—0.055 in}

EX : 1.46—1.94 mm {0.0575—0.0763 in}

Maximum valve seat recession

IN : 1.75 mm {0.0689 in}

EX : 2.29 mm {0.0902 in}