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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 Ring End Gap Measurement Procedure

Piston Ring End Gap Measurement Procedure

WARNING: This page is about a different variant/trim than selected.
    Fig 1: Measuring Piston Ring End Gap
    GM4968Courtesy of GENERAL MOTORS CORP.
  1. Place the piston ring in the area of the bore where the piston ring will travel, approximately 25 mm (1 in) down from the deck surface. Be sure the ring is square with the cylinder bore by positioning the ring with the piston head.
  2. Measure the end gap of the piston ring with feeler gages. Compare the measurements with those provided in the engine mechanical specifications.
  3. If the clearance exceeds the provided specifications, the piston rings must be replaced.
  4. Repeat this procedure for all the piston rings.
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