Hummer H3. Manual — part 405

Fig. 451: View Of For Properly Cut Cylinder Bore Sleeve
Courtesy of GENERAL MOTORS CORP.

23. Looking at the front of the straight edge, check to see if light is protruding through the

bottom of the straight edge and the top of the cylinder block deck surface. If light is present
on both sides of the cylinder block, the cylinder bore sleeve is cut correctly.

24. Proceed to the next bore sleeve to be trimmed repeating steps 10-23 if necessary.

PISTON AND CONNECTING ROD ASSEMBLE

Tools Required

EN-46745 Piston Pin Retainer Remover and Installer. See Special Tools.

Assembly Procedure

2007 Hummer H3

2007 ENGINE Engine Mechanical - 3.7L - H3

Fig. 452: View Of Piston Pin Retaining Clips
Courtesy of GENERAL MOTORS CORP.

1. Lubricate the piston pin with clean engine oil.

2007 Hummer H3

2007 ENGINE Engine Mechanical - 3.7L - H3

Fig. 453: View Of Piston Oil Hole
Courtesy of GENERAL MOTORS CORP.

IMPORTANT: The oil hole, in the connecting rod, should be facing the

exhaust side of the block.

2007 Hummer H3

2007 ENGINE Engine Mechanical - 3.7L - H3

2. Install one of the piston pin retainers into the retainer groove using EN-46745 . See Special

Tools.

Fig. 454: View Of Piston Pin & Connecting Rod
Courtesy of GENERAL MOTORS CORP.

3. Install the connecting rod and piston pin. Push the piston pin in until it bottoms against the

2007 Hummer H3

2007 ENGINE Engine Mechanical - 3.7L - H3