Hummer H3. Manual — part 395

Fig. 419: Piston Ring Expander
Courtesy of GENERAL MOTORS CORP.

CAUTION: Handle the piston carefully. Worn piston rings are sharp

and may cause bodily injury.

2007 Hummer H3

2007 ENGINE Engine Mechanical - 3.7L - H3

1. Remove the piston rings using a piston ring expander.

Fig. 420: View Of Piston Pin Retaining Clips
Courtesy of GENERAL MOTORS CORP.

2. Remove the piston pin retainers using EN-46745 . See Special Tools.

IMPORTANT: Do not reuse the piston rings.

IMPORTANT: Two retainers hold the piston pins in place. Reuse the

retainers if they are not damaged during removal.

2007 Hummer H3

2007 ENGINE Engine Mechanical - 3.7L - H3

Fig. 421: View Of Piston Pin & Connecting Rod
Courtesy of GENERAL MOTORS CORP.

3. Remove the piston pin.

PISTON, CONNECTING ROD AND BEARING CLEANING AND INSPECTION

Tools Required

2007 Hummer H3

2007 ENGINE Engine Mechanical - 3.7L - H3

J 8087 Cylinder Bore Gage. See Special Tools.

Cleaning and Inspection Procedure

Fig. 422: View Of Piston Pin & Connecting Rod
Courtesy of GENERAL MOTORS CORP.

2007 Hummer H3

2007 ENGINE Engine Mechanical - 3.7L - H3