D21 Hardbody XE 4WD L4-2389cc 2.4L SOHC MFI (KA24E) (1997)
Valve Seat: Service and Repair
1. Bore out old seat until it collapses. Boring should not continue beyond the bottom face of the seat recess in cylinder head. Set the machine depth
stop to ensure this.
2. Ream cylinder head recess for service valve seat. 0.5 mm (0.020 inch) oversize:
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Intake 36.500 - 36.516 mm (1.4370 - 1.4376 inch).
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Exhaust 42.500 - 42.516 mm (1.6732 - 1.6739 inch).
NOTE: Be sure to ream in circles concentric to the valve guide center. This will enable valve seat to fit correctly. Use both hands to cut
uniformly.
3. Heat cylinder head to 150 to 160° C (302 to 320° F) by soaking in heated oil.
4. Press fit valve seat until it seats on the bottom.
5. Cut or grind valve seat using suitable tool to specifications.
6. After cutting, lap valve seat with abrasive compound.
7. Check valve seating condition. Seat face angle alpha is 45°. Contacting width "W" for the intake is 1.6 - 1.7 mm (0.063 - 0.067 inch) and the
exhaust is 1.7 - 2.1 mm (0.067 - 0.083 inch).