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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> Engine Mechanical >> Mechanical >> Engine Mechanical - 4.3L (Unit Repair) >> 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 J 5239 Onto Connecting Rod Bolts
    G01660564Courtesy of GENERAL MOTORS CORP.
  3. Install the J 8037  onto the piston and compress the piston rings.
    Fig 2: J 8037 Installing On Piston
    G01660565Courtesy 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 W/J 8037 & Connecting Rod
    G01660566Courtesy 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: Tapping Top Of Piston Using Wooden Hammer
    G01660567Courtesy of GENERAL MOTORS CORP.
  6. Remove the J 5239. 
    Fig 5: J 5239 On Connecting Rod Bolts
    G01660568Courtesy of GENERAL MOTORS CORP.
    NOTE: Refer to FASTENER NOTICE in Cautions and Notices.
  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: Connecting Rod Caps, Bearings & Nuts
    G01660569Courtesy 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: Measuring Connecting Rod Side Clearance Between Connecting Rod Caps
    G01660570Courtesy of GENERAL MOTORS CORP.
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