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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 Diameter Measurement Procedure

Piston Diameter Measurement Procedure

WARNING: This page is about a different variant/trim than selected.
    Fig 1: Measuring Width Of Piston
    GM52034Courtesy of GENERAL MOTORS CORP.
  1. Using an outside micrometer, measure the width of the piston 40 mm (1.575 in) below the crown (top) of the piston at the thrust surface which is perpendicular to the centerline of the piston pin (1).
  2. Compare the measurement to the diameter listed in the engine mechanical specifications.
  3. You must replace the piston if any of its dimensions are out of specification. There are no oversized pistons available.
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