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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1353 (Engine Mechanical - 4.3L) >> Repair Instructions >> Off-Vehicle Repair Instructions >> Piston, Connecting Rod, and Bearing Installation >> Installation Procedure

Installation Procedure

WARNING: This page is about a different car, the 2003 GMC Sierra and 2003 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Apply clean engine oil to the following components:
    • The piston
    • The piston rings
    • The cylinder bore
    • The bearing surfaces
  2. Install the J 5239  onto the connecting rod bolts.
    Fig 1: Install J 5239 Onto Connecting Rod Bolts
    G02106374Courtesy of GENERAL MOTORS CORP.
  3. Install the J 8037  onto the piston and compress the piston rings.
    Fig 2: Compress Piston Rings Using J 8037
    G02106375Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: The mark on the top of the piston must face the front of the engine block.

    When assembled, the flanges on the connecting rod and connecting rod cap should face to the front of the engine block on the left bank, and to the rear of the engine block on the right bank.

  4. Install the piston and connecting rod assembly, and the J 8037  into the proper cylinder bore.
    Fig 3: J 8037 (Cylinder Bore Gage)
    G02106376Courtesy of GENERAL MOTORS CORP.
  5. Use the J 8037  and the J 5239  and lightly tap the top of the piston with a wooden hammer handle.
    1. 5.1. Hold the J 8037  firmly against the engine block until all of the piston rings have entered the cylinder bore.
    2. 5.2. Use the J 5239  in order to guide the connecting rod onto the crankshaft journal.
    Fig 4: J 8037 (Cylinder Bore Gage)
    G02106377Courtesy of GENERAL MOTORS CORP.
  6. Remove the J 5239  .
    Fig 5: Remove J 5239 (Connecting Rod Bolt Guide Set)
    G02106378Courtesy of GENERAL MOTORS CORP.
    NOTE: Refer to FASTENER NOTICE .
  7. Install the connecting rod caps, bearings, and nuts.

    Tighten 

    1. 7.1. Tighten the nuts evenly on the first pass to 27 N.m (20 lb ft).
    2. 7.2. Use the J 36660-A  in order to tighten the nuts on the final pass an additional 70 degrees.
    Fig 6: Install Connecting Rod Caps, Bearings & Nuts
    G02106379Courtesy of GENERAL MOTORS CORP.
  8. After the piston and connecting rod assemblies have been installed, lightly tap each connecting rod assembly, parallel to the crankpin, in order to ensure that the connecting rods have side clearance.
  9. Use a feeler gage or a dial indicator to measure the connecting rod side clearance between the connecting rod caps. The connecting rod side clearance should be 0.15-0.44 mm (0.006-0.017 in).
    Fig 7: Measure Connecting Rod Side Clearance Between Connecting Rod Caps
    G02106380Courtesy of GENERAL MOTORS CORP.