Hummer H2. Manual — part 1812

Fig. 428: Connecting Rod Pin Bore
Courtesy of GENERAL MOTORS CORP.

6. To determine the full-floating piston pin-to-connecting rod bore clearance, use a micrometer and measure

the connecting rod pin bore (1) inside diameter (ID).

7. Subtract the piston pin OD measurement from the connecting rod pin bore ID measurement to determine

2004 Hummer H2

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

pin-to-bore clearance. Refer to Engine Mechanical Specifications .

Fig. 429: Inspecting Bearings For Damage
Courtesy of GENERAL MOTORS CORP.

8. Inspect the connecting rod bearings for craters or pockets. Flattened sections on the bearing halves

indicate fatigue.

2004 Hummer H2

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

Fig. 430: Inspecting Connecting Rod Bearings For Excess Scoring Or Discoloration
Courtesy of GENERAL MOTORS CORP.

9. Inspect the connecting rod bearings for excessive scoring or discoloration.

10. Inspect the connecting rod bearings for dirt or debris imbedded into the bearing material.

2004 Hummer H2

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

Fig. 431: Inspecting Bearings For Improper Seating
Courtesy of GENERAL MOTORS CORP.

11. Inspect the connecting rod bearings for improper seating indicated by bright, polished sections of the

bearing surface.

PISTON AND CONNECTING ROD ASSEMBLE

Press-Fit Piston Pin

Tools Required

J 24086-C Piston Pin Remover/Installer Set. See Special Tools and Equipment .

2004 Hummer H2

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