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Home >> Buick >> 2007 >> Lucerne CX >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 12 (Engine Mechanical - 4.6L (4 Of 5)) >> Off-Vehicle Repair Instructions (2 Of 3) >> Piston, Connecting Rod, and Bearings Cleaning and Inspection >> Piston Ring Side Clearance Measurement Procedure

Piston Ring Side Clearance Measurement Procedure

WARNING: This page is about a different variant/trim than selected.
    Fig 1: Checking Piston Ring Side Clearance
    GM71391Courtesy of GENERAL MOTORS CORP.
  1. Roll the piston ring entirely around the piston ring groove. If any binding is caused by the ring groove, dress the groove with a fine file. If any binding is caused by a distorted piston ring, replace the ring.
  2. With the piston ring on the piston, use feeler gages to check side clearance at multiple locations.
  3. Compare your measurements with those found in the Engine Mechanical Specifications .
  4. If the clearance is greater than specifications, replace the piston rings.
  5. If new piston rings do not bring the clearance within the specification, the piston must be replaced.
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