Hummer H2. Manual — part 1802

Fig. 392: Measuring Crankshaft End Play
Courtesy of GENERAL MOTORS CORP.

12. Measure the crankshaft end play.

1. Thrust the crankshaft forward or rearward.

2. Insert a feeler gauge between the center crankshaft bearing and the bearing surface of the

crankshaft and measure the bearing clearance.

The proper crankshaft end play clearance is 0.04-0.2 mm (0.0015-0.0078 in).

3. If the bearing clearance is not within specifications:

z

Inspect the thrust surfaces for nicks, gouges or raised metal. Minor imperfections may be
removed with a fine stone.

z

Replace the thrust bearings and measure the end play.

z

If the correct measurements cannot be obtained, repair the crankshaft thrust surfaces or
replace the crankshaft.

Measuring Connecting Rod Bearing Clearance - Gaging Plastic Method

2004 Hummer H2

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

Fig. 393: Connecting Rod & Bolts
Courtesy of GENERAL MOTORS CORP.

IMPORTANT:

z

Connecting rod bearings are a precision insert type. Connecting
rods are of a powdered metal design and cannot be shimmed or filed
for bearing fit. If clearances are found to be excessive, a new bearing
and/or connecting rod are required.

2004 Hummer H2

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

1. Remove the bearing cap, bearing half and bolts.

Fig. 394: Gaging Plastic Installed On Crankshaft Journal
Courtesy of GENERAL MOTORS CORP.

2. Install the gaging plastic onto the connecting rod bearing journal. Install the gaging plastic the full width

of the journal.

z

Do not rotate the crankshaft while gaging plastic is between the
crankshaft journal and the bearing surface.

2004 Hummer H2

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

Fig. 395: Connecting Rod & Bolts
Courtesy of GENERAL MOTORS CORP.

3. Install the bearing cap, bearing, and bolts.

Tighten:

1. Tighten the connecting rod bolts first pass to 20 N.m (15 lb ft).

2004 Hummer H2

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