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Home›Repair guides›replace piston and/or rings as necessary. See PISTONS, PINS & RINGS table under

General Motors — replace piston and/or rings as necessary. See PISTONS, PINS & RINGS table under

A General Motors service procedure — check it applies to your exact model before use.

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Before you start

  • On some 4.3L engines, the distance between rear main
  • bearing thrust faces is .008" (.20 mm) wider than
  • standard (identified by .008" stamped on crankshaft

Procedure

  1. Measure the rod bearing journal out-of-round, taper and the oil clearance. If
  2. Ensure rod side play is within specification. See CONNECTING RODS table under
  3. Mark bearing caps for reassembly. Measure journal diameter, out-of-round, taper and
  4. Align thrust bearing surfaces, and measure crankshaft end play. See THRUST
  5. Install main bearing caps (except rear), and tighten cap bolts to specification. See
  6. Tap crankshaft rearward then forward to align thrust surfaces. Tighten rear main

Specs & torque values

  • 10 ft. Ibs. 14 N.m).
  • bearings on these engines, use only .008" (.20 mm)

Source: manual:1995 ENGINE 4.3L VIN W_text.pdf. Figures and steps are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.