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Home >> Buick >> 2007 >> Lucerne CX >> Repair and Diagnosis >> External Pages >> Different car >> Section 237 (Engine Mechanical - 3.9L) >> 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 2006 Pontiac Montana SV6, 2006 Chevrolet Uplander, and 2006 Buick Terraza. However, it is still accessible from the selected car via links, so may be relevant.
    Fig 1: Lubricating Piston Components
    GM64180Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: The piston and cylinder bore have been measured and the bore has been sized for the proper clearance. Install the piston and connecting rod assembly into the proper cylinder bore. The piston alignment mark MUST face the front of the engine block.
  1. Lightly lubricate the following components with clean engine oil:
    • The piston
    • The piston pin
    • The piston rings
    • The cylinder bore
    • The bearing surfaces
  2. Stagger the oil control ring end gaps a minimum of 90 degrees.
  3. Stagger the compression ring end gaps a minimum of 25 mm (1 in).
  4. Install the J 8037 onto the piston and compress the piston rings.
    5. IMPORTANT: When assembling the connecting rod to the piston, make sure the connecting rod reference mark (2) is facing towards front of engine and is in proper correlation with the front of engine piston reference mark (1).
    Fig 2: Identifying Correct Piston Installation
    GM1608921Courtesy of GENERAL MOTORS CORP.
  5. Align the piston pin bore with the connecting rod pin bore.
  6. Align the piston pin bore with the connecting rod pin bore.
    7. Fig 3: Exploded View Of Piston & Connecting Rod Assembly
    GM204785Courtesy of GENERAL MOTORS CORP.
  7. Slide the piston pin (4) into the piston and the connecting rod (3).
    8. IMPORTANT: NEW piston pin retainers must be used. Never reuse the piston pin retainers.
  8. Install NEW piston pin retainers (1) using the J 43654.
  9. Ensure that the piston pin retainers are fully seated in their grooves.
  10. Repeat these procedures for the remaining pistons.
    11. Fig 4: Installing Piston & Connecting Rod Assembly Into Cylinder
    GM43397Courtesy of GENERAL MOTORS CORP.
  11. Install the J 41556 into the connecting rod.
  12. Install the piston and connecting rod assembly into the proper cylinder bore.
    13. IMPORTANT: When installing the pistons into the cylinder bore, make sure not to contact the piston oil nozzle with the connecting rod. Failure to do so may damage the piston oil nozzle, resulting in potential engine damage.
  13. Hold the piston ring compressor firmly against the engine block. Using a wooden hammer handle, lightly tap the top of the piston until all of the piston rings enter the cylinder bore.
    14. Fig 5: Installing Bearing, Bearing Cap And Bolts
    GM1360214Courtesy of GENERAL MOTORS CORP.
  14. Using J 41556  , guide the connecting rod end onto the crankshaft journal
    15. NOTE: Refer to FASTENER NOTICE in Cautions and Notices.
  15. Install the bearing, bearing cap and bolts.

    Tighten: 

    1. Tighten the connecting rod bearing cap bolts a first pass to 25 N.m (18 lb ft).
    2. Tighten the connecting rod bearing cap bolts a final pass to 110 degrees using the J 45059  .

    16. Fig 6: Measuring Connecting Rod Side Clearance
    GM626625Courtesy of GENERAL MOTORS CORP.
  16. With the pistons and connecting rods installed, use a soft faced mallet and lightly tap each connecting rod assembly parallel to the crankpin to make sure that the rods have side clearance.
  17. Measure the connecting rod side clearance using a feeler gage or dial indicator. Connecting rod side clearance should be within 0.18-0.44 mm (0.007-0.017 in).
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