Installation Procedure

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 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 (1.0 in).
   Fig 1: Lubricating Compression Rings

   Courtesy of GENERAL MOTORS CORP.
4. Install the J 41556  to the connecting rod.
5. Install the J 8037  onto the piston and compress the piston rings.

   Important:  The piston alignment mark MUST facing the front of the engine block

6. Install the piston and connecting rod assembly into the proper cylinder bore.
   1. 6.1. 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.
   2. 6.2. Use the J 41556  to guide the connecting rod end onto the crankshaft journal.
   Fig 2: Installing J 8037 Onto Piston & Compress Piston Rings

   Courtesy of GENERAL MOTORS CORP.
7. Remove the J 41556  .
   Fig 3: Removing J 41556

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   NOTE: Refer to FASTENER NOTICE in Cautions and Notices.

   Important:  Position the connecting rod cap onto the connecting rod properly.

   Align the flat side of the connecting rod cap with the flat side of the connecting rod.

8. Install the bearing, cap, and bolts.

   Tighten 

   1. 8.1. Tighten the bolts a first pass evenly to 20 N.m (15 lb ft).
   2. 8.2. Tighten the bolts a final pass to 75 degrees using the J 36660-A  .
   Fig 4: Installing Bearing, Cap & Bolts

   Courtesy of GENERAL MOTORS CORP.
9. Inspect the connecting rods for proper orientation onto the crankshaft journal.
10. 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.
11. Measure the connecting rod side clearance using a feeler gage or a dial indicator. Connecting rod side clearance should be within 0.11-0.51 mm (0.0043-0.02 in).
    Fig 5: Measuring Connecting Rod Side Clearance Using A Feeler Gage

    Courtesy of GENERAL MOTORS CORP.