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Home >> GMC >> 1991 >> Value Van 7.4 N >> Repair and Diagnosis >> External Pages >> Different car >> Section 87 (3.0L V6 - VIN [3]) >> Overhaul >> Cylinder Block Assembly >> Cylinder Block

Cylinder Block

WARNING: This page is about a different car, the 1995 Plymouth Voyager, 1995 Plymouth Grand Voyager, 1995 Dodge Grand Caravan, and 1995 Dodge Caravan. However, it is still accessible from the selected car via links, so may be relevant.
  1. Using a feeler gauge and straightedge, check cylinder block deck surface for warpage. Resurface cylinder block if warpage exceeds specification. See CYLINDER BLOCK  table under ENGINE SPECIFICATIONS.
    CAUTION: DO NOT grind more than .008" (.20 mm) combined total from surface of cylinder head and deck surface of cylinder block.
  2. Check cylinder bore, taper and out-of-round. Measurements should be taken at .50" (12.7 mm) below top surface of cylinder bore, middle of bore and .50" (12.7 mm) from bottom of cylinder bore.
  3. Ensure bore diameter, taper and out-of-round are within specification. See CYLINDER BLOCK  table under ENGINE SPECIFICATIONS. Cylinder block can be bored for oversize pistons if not within specification. Oversize pistons are available in .010" (.25 mm), .020" (.50 mm), .030" (.75 mm) and .039" (1.00 mm) sizes.
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