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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1021 (Engine Mechanical - 8.1L) >> Repair Instructions >> Off-Vehicle Repair Instructions >> Piston and Connecting Rod Assemble >> Full-Floating Piston Pin

Full-Floating Piston Pin

WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
    NOTE: Install the piston pin retainers correctly in the retaining groove during assembly in order to avoid engine damage.
  1. Install the retaining clip. The clip should be seated in the groove of the pin bore.
    2. Fig 1: View Of Retaining Clip In Pin Bore Groove
    GM1366372Courtesy of GENERAL MOTORS CORP.
  2. Lubricate the pin and pin bore with clean engine oil.
  3. Install the piston pin to the piston and connecting rod.
    4. Fig 2: View Of Piston Pin, Piston, Clips & Connecting Rod
    GM35866Courtesy of GENERAL MOTORS CORP.
  4. Install the retaining clip. The clip should be seated in the groove of the pin bore. Ensure the pin moves freely within the piston pin bore.
    5. NOTE: Use a piston ring expander to install the piston rings. The rings may be damaged if expanded more than necessary.
  5. Using piston ring pliers, install the piston rings onto the piston.
    6. Fig 3: Removing/Installing Piston Rings
    GM490763Courtesy of GENERAL MOTORS CORP.
  6. Install the lower oil control piston ring spacer onto the piston.
  7. Install the lower oil control piston ring onto the piston (1).
    8. Fig 4: View Of Lower Oil Control Piston Ring Spacer
    GM562836Courtesy of GENERAL MOTORS CORP.
    Fig 5: View Of Lower Oil Control Piston Ring
    GM562842Courtesy of GENERAL MOTORS CORP.
  8. Install the upper oil control piston ring onto the piston (1).
    9. Fig 6: View Of Upper Oil Control Piston Ring
    GM562839Courtesy of GENERAL MOTORS CORP.
  9. Position the oil control piston ring end gaps a minimum of 90 degrees apart (1, 2, 3).
    10. Fig 7: View Of Oil Control Piston Rings
    GM562848Courtesy of GENERAL MOTORS CORP.
  10. Install the lower compression piston ring onto the piston. The mark (1) on the side of the piston ring should face the top of the piston.
    11. Fig 8: View Of Lower Compression Piston Ring Mark
    GM562823Courtesy of GENERAL MOTORS CORP.
  11. Install the upper compression piston ring onto the piston. The mark (1) on the side of the piston ring should face the top of the piston.
    12. Fig 9: View Of Upper Compression Piston Ring Mark
    GM562819Courtesy of GENERAL MOTORS CORP.
  12. Position the compression ring end gaps 120 degrees apart.
  13. Install the connecting rod bearings (3) to the rod (2) and cap (4).
    14. Fig 10: View Of Piston & Connecting Rod Components
    GM1366359Courtesy of GENERAL MOTORS CORP.
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