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Home >> Chevrolet >> 1990 >> Step Van 7.4 N, Standard >> Repair and Diagnosis (Single Page) >> Engine Mechanical >> Mechanical >> 6.2L V8 Diesel - VINS [C,J] >> Removal & Installation >> Cylinder Head >> Cleaning & Inspection

Cleaning & Inspection

  1. Inspect head for cracks and warpage. Replace cylinder head if warpage exceeds .006" (.15 mm) longitudinally (across head length) or .003" (.08 mm) transversely (across head width).
    NOTE: Cylinder head should not be resurfaced. Replace cylinder head if not within specification or damaged.
  2. Prechamber installed depth must be checked. Measure prechamber depth at seating point on head gasket shield and sealing ring. Measurement must be taken at 2 or more locations.
  3. Measure difference between prechamber flat surface and cylinder head flat surface. Prechamber must not protrude more than .002" (.05 mm) from cylinder head or be recessed in cylinder head.
  4. Inspect prechamber for facial cracks. Replace prechamber if facial crack length exceeds 3/16" or if crack reaches head gasket sealing mark.


  1. Inspect head for cracks and warpage. Replace cylinder head if warpage exceeds .006" (.15 mm) longitudinally (across head length) or .003" (.08 mm) transversely (across head width).
    NOTE: Cylinder head should not be resurfaced. Replace cylinder head if not within specification or damaged.
  2. Prechamber installed depth must be checked. Measure prechamber depth at seating point on head gasket shield and sealing ring. Measurement must be taken at 2 or more locations.
  3. Measure difference between prechamber flat surface and cylinder head flat surface. Prechamber must not protrude more than .002" (.05 mm) from cylinder head or be recessed in cylinder head.
  4. Inspect prechamber for facial cracks. Replace prechamber if facial crack length exceeds 3/16" or if crack reaches head gasket sealing mark.
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