940 L4-2.3L SOHC VIN 88 B230F (1992)
Valve Seat Removal Step #3
4. Tap out valve seat:
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Use a long drift, passing through cylinder head channel.
5. Check valve seat recess:
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If damaged, ream recess to next oversize.
Valve Seat Recess Measurement Step #1
6. Measure diameter of valve seat recess:
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Use an inside micrometer.