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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 638 (Engine Mechanical - 4.0L (Unit Repair)) >> Repair Instructions >> Piston and Connecting Rod Assemble >> Piston and Piston Pin Installation Procedure

Piston and Piston Pin Installation Procedure

WARNING: This page is about a different car, the 2002 Oldsmobile Aurora and 2001 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.
  1. Properly orient the piston (1) on the connecting rod (2) as follows:
    • The locating mark (4) cast into the underside of the piston should point towards the front of the engine.
    • The locating notch (3) on the connecting rod cap should be pointing towards the rear of the engine on odd-numbered cylinders and towards the front of the engine on even-numbered cylinders.
  2. Lubricate the piston pin bores in the piston and connecting rod with GM prelube lubricant GM P/N 1052367 or equivalent
    Fig 1: Identifying Proper Piston To Connecting Rod Position
    G01815864Courtesy of GENERAL MOTORS CORP.
  3. Align the piston pin bore with the connecting rod pin bore.
  4. Slide the piston pin (4) into the piston and the connecting rod (3).

    Important:  New piston pin retainers must be used. Never reuse the piston pin retainers.

  5. Install NEW piston pin retainers (1).
  6. Ensure that the piston pin retainers are fully seated in their grooves.
  7. Repeat these procedures for the remaining pistons.
    Fig 2: Aligning Piston Bore With Connecting Rod Pin Bore
    G01815865Courtesy of GENERAL MOTORS CORP.
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