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Home >> Infiniti >> 1992 >> G20 Automatic >> Repair and Diagnosis (Single Page) >> Engine Mechanical >> Mechanical >> 2.0L 4-CYL - VIN [C] >> Overhaul >> Valve Seat

Valve Seat

  1. Ensure valve seat angle and seat width are within specification. See CYLINDER HEAD  table under ENGINE SPECIFICATIONS. Valve seat can be replaced if damaged.
  2. To replace valve seat, ream valve seat until valve seat collapses. Cylinder head must be reamed for replacement valve seat. Adjust reaming machine depth stop so cylinder head will not be reamed beyond bottom face of valve seat recess in cylinder head.
  3. Ream cylinder head valve seat bore diameter to 1.3976-1.3983" (35.499-35.517 mm) for intake or 1.2402-1.2408" (31.501-31.516 mm) for exhaust valves.
  4. Heat cylinder head to 230-266°F (110-130°C). Press replacement valve seat in cylinder head until it bottoms in cylinder head. Cut replacement valve seat to proper angle and seat width. See CYLINDER HEAD  table under ENGINE SPECIFICATIONS.
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