Hummer H3. Manual — part 193

3. Clean the piston and cylinder bore with soap and water. Dry the cylinder bore and

piston. Lubricate the cylinder bore with clean engine oil.

23. Use the following procedure to measure the piston-to-cylinder bore clearance.

1. Subtract the piston diameter from the cylinder bore diameter to determine the piston-

to-bore clearance.

2. Compare the piston-to-bore clearance using the specifications to determine if the

clearance is in the acceptable range.

3. If the used piston is not acceptable, a new service piston may be selected.

24. When a piston has been selected, mark the piston to identify the cylinder for which the

piston was fitted.

25. Select a set of new piston rings.

26. Install each ring, one at a time, into the corresponding cylinder.

27. Install the piston for that cylinder, upside down (top of piston pushing on the ring) and push

the ring to approximately 25 mm (1 in) down from the deck surface.

28. Remove the piston.

29. Measure the ring end gap with a feeler gage.

2006 Hummer H3

2006 ENGINE Engine Mechanical - 3.5L (L52) - H3

Fig. 403: Measuring Piston Ring 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.

2006 Hummer H3

2006 ENGINE Engine Mechanical - 3.5L (L52) - 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-45680-400 Cylinder Sleeve Removal and Installation Kit. See Special Tools.

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.

2006 Hummer H3

2006 ENGINE Engine Mechanical - 3.5L (L52) - H3

Fig. 404: 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-45680-400 ,

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.

2006 Hummer H3

2006 ENGINE Engine Mechanical - 3.5L (L52) - H3