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Home >> Infiniti >> 1996 >> J30 Base >> Repair and Diagnosis >> Engine Mechanical >> Mechanical >> 3.0L V6 >> Overhaul >> Cylinder Block Assembly >> Cylinder Block

Cylinder Block

  1. Inspect cylinder block deck surface warpage. Resurface cylinder block if warpage exceeds specification. See CYLINDER BLOCK  under ENGINE SPECIFICATION.
    CAUTION: DO NOT machine more than .008" (.20 mm) total from cylinder head and cylinder block deck surface.
  2. Measure cylinder bore diameter at .79" (20 mm), 2.36" (60 mm) and 3.94" (100 mm) from top of cylinder bore. Ensure cylinder bore diameter is within specification. Different cylinder bores are used and can be identified by No. "1", "2" or "3" grade number stamped on deck surface in accordance with cylinder location. See Figure .
  3. Cylinder block can be bored if cylinder bore, taper or out-of-round are not within specification. See CYLINDER BLOCK  under ENGINE SPECIFICATIONS. Pistons are available in .010" (.25 mm) and .020" (.50 mm) oversize.
    CAUTION: When boring cylinder block, ensure main bearing beam is installed and bolts are tightened to specification.
  4. Ensure main bearing bore I.D. is within specification with main bearing beam installed and bolts tightened to specification. See CYLINDER BLOCK  .
NOTE: Main bearing bore I.D. will depend on main journal grade number stamped on cylinder block. See Figure . Main journal grade number may be "0", "1" or "2".
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