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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 638 (Engine Mechanical - 4.0L (Unit Repair)) >> Repair Instructions >> Piston, Connecting Rod, and Bearings Cleaning and Inspection >> Piston Pin Bore Measurement Procedure

Piston Pin Bore Measurement Procedure

WARNING: This page is about a different car, the 2002 Oldsmobile Aurora and 2001 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.
  1. Piston pin bores and pins must be free of varnish or scuffing.
  2. Use an outside micrometer to measure the piston pin in the piston contact areas.
  3. Using an inside micrometer, measure the piston pin bore.
  4. Subtract the measurement of the piston pin bore from the piston pin.
  5. Compare the result with the engine mechanical specifications.
  6. If the clearance is excessive, determine which piece is out of specification and replace as necessary.
    Fig 1: Measuring Piston Pin Bore
    G01815861Courtesy of GENERAL MOTORS CORP.
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