Corolla Sedan 4-Door L4-1587cc 1.6L DOHC MFI (1997)
Valve: Service and Repair
Grind Valves
1. Grind the valve enough to remove pits and carbon.
2. Check that the valve is ground to the correct valve face angle. Valve face angle: 44.5°
3. Check the valve head margin thickness.
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Standard margin thickness: 0.8-1.2 mm (0.031-0.047 inch)
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Minimum margin thickness: 0.5 mm (0.020 inch)
CAUTION: If the margin thickness is less than minimum, replace the valve.
4. Check the surface of the valve stem tip for wear. If the valve stem tip is worn, resurface the tip with a grinder or replace the valve.
CAUTION: Do not grind off more than minimum.
5. Check the valve overall length.
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Standard overall length:
Intake 87.45 mm (3.4429 inch)
Exhaust 87.84 mm (3.4583 inch)
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Minimum overall length:
Intake 86.95 mm (3.4232 inch)
Exhaust 87.35 mm (3.4390 inch)
