Hummer H2. Manual — part 1815

Fig. 440: Piston & Connecting Rod Components
Courtesy of GENERAL MOTORS CORP.

14. Install the connecting rod bearings (3) to the rod (2) and cap (4).

Full-Floating Piston Pin

2004 Hummer H2

2004 ENGINE Engine Mechanical - 4.8L, 5.3L, and 6.0L - Hummer H2

Fig. 441: Retaining Clip In Pin Bore Groove
Courtesy of GENERAL MOTORS CORP.

1. Install the retaining clip. The clip should be seated in the groove of the pin bore.

2004 Hummer H2

2004 ENGINE Engine Mechanical - 4.8L, 5.3L, and 6.0L - Hummer H2

Fig. 442: Identifying Piston & Components
Courtesy of GENERAL MOTORS CORP.

2. Install the piston pin to the piston and connecting rod.

3. Install the retaining clip. The clip should be seated in the groove of the pin bore.

2004 Hummer H2

2004 ENGINE Engine Mechanical - 4.8L, 5.3L, and 6.0L - Hummer H2

Fig. 443: Upper & Lower Compression Rings & Marks
Courtesy of GENERAL MOTORS CORP.

4. Identify the compression and oil control rings for proper installation. The upper compression ring can be

identified by a paint mark (3) located 180 degrees from the end gap. The lower compression ring can be
identified by a paint mark (3) located 90 degrees from the end gap. Both rings should be installed with the
orientation marks (1, 2) facing the top of the piston.

IMPORTANT: When installing piston rings, use a ring expander plier type tool. Do not

roll the rings into the grooves of the piston. Use caution and care to
expand the rings only slightly larger than the outside diameter (OD) of the
piston.

2004 Hummer H2

2004 ENGINE Engine Mechanical - 4.8L, 5.3L, and 6.0L - Hummer H2