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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 62 (Engine Mechanical) >> Repair Instructions >> Off-Vehicle Repair Instructions >> Piston, Connecting Rod, and Bearing Installation >> Piston, Pin, and Connecting Rod Installation

Piston, Pin, and Connecting Rod Installation

WARNING: This page is about a different car, the 2007 Hummer H2. However, it is still accessible from the selected car via links, so may be relevant.
    Fig 1: View Of Piston, Connecting Rod & Bearing Assembly
    GM1552501Courtesy of GENERAL MOTORS CORP.
  1. Lubricate the following components with clean engine oil:
    • Piston
    • Piston rings
    • Cylinder bore
    • Bearings and bearing surfaces
  2. Install the bearings to the connecting rod and cap.
  3. Position the oil control ring end gaps a minimum of 25 mm (1.0 in) from each other.
  4. Position the compression ring end gaps 180 degrees opposite each other.
    5. Fig 2: Installing J 41556 To Connecting Rod
    GM1552499Courtesy of GENERAL MOTORS CORP.
  5. Install the J 41556  to the connecting rod. See Special Tools .
    6. Fig 3: View of Mark On Top Of Piston & Connecting Rod Tab
    GM1768708Courtesy of GENERAL MOTORS CORP.
  6. Identify the proper installation direction of the piston and connecting rod assembly. When installing the piston and connecting rod assembly, the mark on the top of the piston (1) and the tab (2) on the side of the connecting rod should face the front of the engine.
    7. Fig 4: Installing Piston
    GM1552497Courtesy of GENERAL MOTORS CORP.
  7. Install the J 8037  onto the piston and compress the piston rings. See Special Tools .
    8. IMPORTANT: The piston alignment mark MUST face the front of the engine block.
  8. Install the piston, pin, and connecting rod assembly into the cylinder bore. Hold the piston ring compressor firmly against the engine block. Using a wooden hammer handle, lightly tap the top of the piston until all piston rings have entered the cylinder bore.
  9. Use the J 41556  to guide the connecting rod onto the crankshaft journal. See Special Tools .
  10. Remove the J 41556  from the connecting rod. See Special Tools .
    11. Fig 5: Connecting Rod Bolt, Cap & Bearing
    GM1552547Courtesy of GENERAL MOTORS CORP.
    NOTE: Refer to Fastener Notice .
    IMPORTANT: The connecting rod and cap must be assembled with the mating surfaces properly aligned.
  11. Install the bearing cap (103), bearing (104), and bolts (102).

    Tighten: 

    1. Tighten the bolts a first pass to 20 N.m (15 lb ft).
    2. Tighten the bolts a final pass to 75 degrees using the J 45059  . See Special Tools .

    12. Fig 6: Measuring Connecting Rod Side Clearance
    GM1366378Courtesy of GENERAL MOTORS CORP.
  12. Measure the connecting rods for the proper side clearance. Refer to Engine Mechanical Specifications .
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