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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1444 (Engine Mechanical - 5.3L (Lm4)) >> Repair Instructions >> Off-Vehicle Repair Instructions >> Piston, Connecting Rod, and Bearings Cleaning and Inspection >> Measuring Piston Ring End Gap

Measuring Piston Ring End Gap

WARNING: This page is about a different car, the 2004 GMC Envoy XUV, 2004 GMC Envoy XL, 2004 Chevrolet TrailBlazer, and 2004 Buick Rainier. However, it is still accessible from the selected car via links, so may be relevant.
    Fig 1: View Of Upper/Lower Compression Rings & Marks
    GM1336810Courtesy of GENERAL MOTORS CORP.
    IMPORTANT:
    • Do not attempt to file the end of the piston ring to achieve the proper end gap clearance.
    • Measure the piston ring in the cylinder in which it will be used.
  1. Identify the NEW upper and lower compression rings. The upper compression ring can be identified by a paint mark (3) located 180 degrees from the end gap. The lower compression ring can be identified by a paint mark (3) located 90 degrees from the end gap. Both rings should be installed with the orientation marks (1, 2) facing the top of the piston.
    2. Fig 2: Measuring Piston Ring End Gap
    GM4968Courtesy of GENERAL MOTORS CORP.
  2. Place the piston ring into the cylinder bore 6.5 mm (0.25 in) below the top of the ring travel area.
  3. Insert a feeler gage and measure the piston ring end gap. Refer to Engine Mechanical Specifications  .
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