Hummer H3. Manual — part 398

Fig. 428: Measuring Ring End Gap
Courtesy of GENERAL MOTORS CORP.

30. If the ring gap is not within the specification range, replace the rings.

31. Measure the piston ring side clearance - compression rings.

NOTE:

The piston ring groove must only be cleaned with a ring groove
cleaning tool. Proper engine performance and durability
depends on the straightness and smoothness of the ring
groove. Cleaning the piston ring groove with an improper tool
can damage the piston ring groove and effect the performance
and durability of the engine.

2007 Hummer H3

2007 ENGINE Engine Mechanical - 3.7L - H3

32. Use the following procedure to measure the compression ring side clearance.

1. Roll the piston ring around the groove.

2. Measure the side clearance with a feeler gage.

3. If the ring is too tight, inspect the piston ring groove for nicks, burrs or damage. Use

emery cloth to remove any minor burrs.

4. If the ring side clearance is greater than the specification, replace the piston.

CYLINDER SLEEVE REMOVAL

Tools Required

EN-45680-450 Cylinder Sleeve Removal and Installation Kit. See Special Tools.

Removal Procedure

NOTE:

Do not chill or heat the cylinder bore sleeve or the cylinder
block when removing or installing a new cylinder bore sleeve.
Chilling or heating the cylinder bore sleeve or the cylinder
block will cause engine damage and will not aid the removal or
installation of the new cylinder bore sleeve.

NOTE:

Do not damage the crankshaft connecting rod journals or
reluctor ring or engine damage will occur.

2007 Hummer H3

2007 ENGINE Engine Mechanical - 3.7L - H3

Fig. 429: View Of Cylinder Bore Liner Puller
Courtesy of GENERAL MOTORS CORP.

1. If the crankshaft is still installed, rotate the crankshaft so that the counterweight is to the

right side and the connecting rod journal is to the left side and not in alignment with the
cylinder bore.

2. Install the cylinder bore sleeve puller EN 45680-402 (1) which is part of EN-45680-450 ,

through the cylinder bore. See Special Tools.

NOTE:

Ensure that the shoe is flat against the bottom of the cylinder
bore sleeve or damage to the cylinder bore sleeve puller will
occur.

2007 Hummer H3

2007 ENGINE Engine Mechanical - 3.7L - H3

3. Align the shoe (1) of the cylinder bore sleeve puller EN 45680-402 to the bottom of the

cylinder bore sleeve (117).

Fig. 430: Threaded Shaft
Courtesy of GENERAL MOTORS CORP.

2007 Hummer H3

2007 ENGINE Engine Mechanical - 3.7L - H3