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Home >> GMC >> 1992 >> Forward Control 5.7 K, Standard >> Repair and Diagnosis (Single Page) >> Engine Mechanical >> Mechanical >> 4.3L V6 - VINS [W,Z] (Including SYCLONE) >> Overhaul >> Cylinder Block Assembly >> Crankshaft & Main Bearings

Crankshaft & Main Bearings

  1. Mark bearing caps for reassembly. Measure journal diameter, out-of-round, taper and oil clearance. If measurement is not within specification, replace main bearings and/or machine crankshaft. See CRANKSHAFT, MAIN & CONNECTING ROD BEARINGS  table under ENGINE SPECIFICATIONS at end of article.
  2. Align thrust bearing surfaces, and measure crankshaft end play. See Thrust Bearing below.
NOTE: Distance between rear main bearing thrust faces on some engines is .008" (.20 mm) wider than standard. When replacing rear main bearings on these engines (identified by .008" stamped on crankshaft rear counterweight), use only .008"(.20 mm) wider bearings.
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