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Home >> GMC >> 2006 >> Sierra 1500 HD, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1063 (Engine Mechanical - 4.3L) >> Repair Instructions - Off Vehicle >> Piston, Connecting Rod, and Bearing Installation >> Installation Procedure

Installation Procedure

WARNING: This page is about a different car, the 2008 GMC Sierra and 2008 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. Fig 1: Compressing The Piston Rings Using J 8037
    GM480573Courtesy of GENERAL MOTORS CORP.
  2. Install the J 8037  onto the piston and compress the piston rings. See Special Tools .
    3. Fig 2: View Of Piston
    GM1792310Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: When assembled, the following reference marks must be addressed; the reference mark on top of the piston (1) must face the front of the engine block. The dimple on the connecting rod (2) must face the front of the engine block on cylinders 2, 4, and 6, and towards the rear of the engine block on cylinders 1, 3, and 5. Wrap a clean, lint free towel around the connecting rod ends when installing the piston into the cylinder so as not to damage the crankshaft journals or cylinder bore.
  3. Check reference marks prior to installation into the block.
    4. Fig 3: View Of Connecting Rod & Piston Assembly
    GM909623Courtesy of GENERAL MOTORS CORP.
  4. Install the piston and connecting rod assembly, and the J 8037  into the proper cylinder bore. See Special Tools .
    5. Fig 4: Installing Piston & Connecting Rod Assembly Into Engine
    GM5159Courtesy of GENERAL MOTORS CORP.
  5. Use the J 8037  and lightly tap the top of the piston with a wooden hammer handle. See Special Tools .

    Hold the J 8037  firmly against the engine block until all of the piston rings have entered the cylinder bore. See Special Tools .

    6. IMPORTANT: The connecting rods and rod bearing caps are NOT interchangeable. Reference the match marks on the connecting rods and the connecting rod bearing caps made in the removal procedure to ensure that they are assembled in their original position and direction, with the connecting rod/rod bearing cap mating surfaces properly oriented and aligned.
    Fig 5: View Of Bearing, Bearing Cap & Bolts
    GM1360214Courtesy of GENERAL MOTORS CORP.
    NOTE: Refer to Fastener Notice .
  6. Install the connecting rod bearing, cap, and bolts.

    Tighten: 

    1. Tighten the bolts evenly on the first pass to 20 N.m (15 lb ft).
    2. Use the J 45059  in order to tighten the bolts on the final pass an additional 100 degrees. See Special Tools .

    7. Fig 6: Measuring Connecting Side Clearance
    GM5163Courtesy of GENERAL MOTORS CORP.
  7. 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.
  8. 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).
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