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Home >> Cadillac >> 2004 >> CTS Base, 3.2 N >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 8 (Engine Mechanical - 5.7L (LS6)) >> Repair Instructions >> Off-Vehicle Repair Instructions >> Piston, Connecting Rod, and Bearings Cleaning and Inspection >> Piston, Pin, and Piston Rings

Piston, Pin, and Piston Rings

WARNING: This page is about a different variant/trim than selected.
  1. Clean the varnish and carbon from the piston (1) using cleaning solvent.
    Fig 1: View Of Piston & Connecting Rod Components
    GM1366359Courtesy of GENERAL MOTORS CORP.
    2. CAUTION: Wear safety glasses in order to avoid eye damage.
  2. Dry the components with compressed air.
    3. Fig 2: Cleaning The Piston Ring Grooves With Suitable Ring Groove Cleaning Tool
    GM4977Courtesy of GENERAL MOTORS CORP.
  3. Clean the piston ring grooves with a suitable ring groove cleaning tool.
  4. Clean the oil lubrication holes and slots.
    5. Fig 3: Identifying Piston Damage Inspection Areas
    GM156168Courtesy of GENERAL MOTORS CORP.
  5. Inspect the piston for the following conditions:
    • Cracks in the piston ring lands, the piston skirt, or pin bosses
    • Piston ring grooves for nicks, burrs, or warpage which may cause the piston ring to bind

      MINOR imperfections may be removed from the piston with a fine file.

    • Scuffed or damaged skirts (2)
    • Eroded areas at the top of the piston (1)
    • Scoring to the full-floating design piston pin bore (3) or piston pin
    6. Fig 4: View Of Upper/Lower Compression Rings & Marks
    GM1336810Courtesy of GENERAL MOTORS CORP.
  6. 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.
    7. Fig 5: Inserting Piston Ring Into Ring Groove
    GM4969Courtesy of GENERAL MOTORS CORP.
  7. Insert the edge of the piston ring into the piston ring groove.

    Roll the piston ring completely around the piston. If binding is caused by distorted ring groove, MINOR imperfections may be removed with a fine file. If binding is caused by a distorted piston ring, replace the rings as required.

    8. Fig 6: Measuring Piston Ring Side Clearance
    GM22934Courtesy of GENERAL MOTORS CORP.
  8. Measure the piston ring side clearance with a feeler gauge. If side clearance is not within specifications, try another piston ring. If the proper ring-to- groove clearance cannot be obtained, replace the first design press-fit piston, pin, and connecting rod assembly. Refer to Engine Mechanical Specifications (LS6) .
    9. Fig 7: Measuring Piston Pin Diameter
    GM4976Courtesy of GENERAL MOTORS CORP.
  9. To determine piston pin-to-bore clearance, use a micrometer and measure the piston pin outside diameter (OD).
    10. Fig 8: Measuring The Piston Pin Bore
    GM4975Courtesy of GENERAL MOTORS CORP.
  10. To determine the piston pin-to-bore clearance, use an inside micrometer and measure the piston pin bore inside diameter (ID).
  11. Subtract the piston pin OD measurement from the piston pin bore ID measurement to determine pin-to-bore clearance.

    Refer to Engine Mechanical Specifications (LS6) .

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