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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 528 (Engine Mechanical - 5.3L, 6.0L, 6.2L - Repair Instructions - Off Vehicle) >> Repair Instructions - Off Vehicle >> Piston, Connecting Rod, and Bearing Cleaning and Inspection >> Piston, Pin, and Piston Rings

Piston, Pin, and Piston Rings

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    Fig 1: View Of Piston, Pin & Piston Rings
    GM1559868Courtesy of GENERAL MOTORS COMPANY
    NOTE:
    • Replace pistons, pins, and connecting rods that are damaged or show signs of excessive wear.
    • The piston and pin are to be serviced as an assembly.
    • Do not wire brush any part of the piston.
    • Measurement of the components should be taken with the components at normal room temperature.
  1. Clean the varnish and carbon from the piston (107) using cleaning solvent.
    2. WARNING:

    Refer to Safety Glasses Warning .

  2. Dry the components with compressed air.
    3. Fig 2: Cleaning Piston Ring Grooves
    GM4977Courtesy of GENERAL MOTORS COMPANY
  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 COMPANY
  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.

    • Eroded areas at the top of the piston (1)
    • Scuffed or damaged skirts (2)
    • Scoring to the piston pin bore (3) or piston pin
    6. Fig 4: Inserting Piston Ring Into Ring Groove
    GM4969Courtesy of GENERAL MOTORS COMPANY
  6. 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 a 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.

    7. Fig 5: Measuring Piston Ring Side Clearance
    GM22934Courtesy of GENERAL MOTORS COMPANY
  7. 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 piston and pin as an assembly. Refer to Engine Mechanical Specifications (RPO LMG VIN 0) , Engine Mechanical Specifications (RPO L9H) , Engine Mechanical Specifications (RPO L94 VIN F) , Engine Mechanical Specifications (RPO L96 VIN G) , Engine Mechanical Specifications (RPO LC9 VIN 7) .
    8. Fig 6: Measuring Piston Pin Diameter
    GM4976Courtesy of GENERAL MOTORS COMPANY
  8. To determine piston pin-to-bore clearance, use a micrometer and measure the piston pin outside diameter (OD).
    9. Fig 7: Measuring Piston Pin-To-Bore Clearance
    GM1552429Courtesy of GENERAL MOTORS COMPANY
  9. To determine the piston pin-to-bore clearance, use an inside micrometer and measure the piston pin bore inside diameter (ID).
  10. Subtract the piston pin OD measurement from the piston pin bore ID measurement to determine pin-to-bore clearance. Refer to Engine Mechanical Specifications (RPO LMG VIN 0) , Engine Mechanical Specifications (RPO L9H) , Engine Mechanical Specifications (RPO L94 VIN F) , Engine Mechanical Specifications (RPO L96 VIN G) , Engine Mechanical Specifications (RPO LC9 VIN 7) .
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