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Home >> Cadillac >> 2006 >> STS Base, 3.6 7, RWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 24 (Engine Mechanical - 4.6L (LH2) - 3 Of 5) >> Off-Vehicle Repair Instructions (Part 2) >> Piston, Connecting Rod, and Bearing Cleaning and Inspection - Off Vehicle >> Piston Pin Bore Measurement Procedure

Piston Pin Bore Measurement Procedure

WARNING: This page is about a different variant/trim than selected.
    Fig 1: Measuring Piston Pin Diameter
    GM4976Courtesy of GENERAL MOTORS CORP.
  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. Fig 2: Measuring Piston Pin Bore
    GM1400636Courtesy of GENERAL MOTORS CORP.
  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.
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