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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> Engine Mechanical >> Engine Mechanical - 4.3L >> Repair Instructions >> Off-Vehicle Repair Instructions >> Piston, Connecting Rod, and Bearing Installation >> Installation Procedure

Installation Procedure

  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: Installing Connecting Rod Bolts
    G01644052Courtesy of GENERAL MOTORS CORP.
  3. Install the J 8037  onto the piston and compress the piston rings.
    Fig 2: Installing Piston And Compress
    G01644053Courtesy 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: Installing Piston And Connecting Rod Assembly
    G01644054Courtesy 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.
    Fig 4: Using J 5239
    G01644055Courtesy of GENERAL MOTORS CORP.
    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.
  6. Remove the J 5239. 
    Fig 5: Removing J 5239
    G01644056Courtesy of GENERAL MOTORS CORP.
    NOTE: Refer to FASTENER NOTICE in Cautions and Notices.
  7. Install the connecting rod caps, bearings, and nuts.
    Fig 6: Using J 36660-A
    G01644057Courtesy of GENERAL MOTORS CORP.

    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.
  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: Measuring Connecting Rod Side Clearance Between Connecting Rod Caps
    G01644058Courtesy of GENERAL MOTORS CORP.
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