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Home >> Chevrolet >> 2001 >> Venture Base, Van Passenger >> Repair and Diagnosis >> External Pages >> Different car >> Section 425 (Engine Mechanical - 4.0L (Unit Repair)) >> Repair Instructions >> Piston, Connecting Rod, and Bearings Cleaning and Inspection >> Piston Ring End Gap Measurement Procedure

Piston Ring End Gap 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. 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.
    Fig 1: Measuring Piston Ring End Gap
    G01815862Courtesy of GENERAL MOTORS CORP.
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