Hummer H3. Manual — part 439

Fig. 579: View Of Fixture Plate, Drill Bushing & Tool Marking
Courtesy of GENERAL MOTORS CORP.

20. Rotate the driver installation tool until the mark (3) on the driver installation tool aligns

with the top of the drill bushing (2).

21. Inspect the insert for proper installation into the tapped hole.

2007 Hummer H3

2007 ENGINE Engine Mechanical - 3.7L - H3

Fig. 580: View Fixture Plate & Bolts - Crankshaft Main Bolt Hole Thread Repair
Courtesy of GENERAL MOTORS CORP.

22. Remove the fixture plate bolts (1).

23. Remove the fixture plate (3) and bushing (2).

SERVICE PRIOR TO ASSEMBLY

Dirt will cause premature wear of the rebuilt engine. Clean all of the components. Use the proper
tools in order to measure components when inspecting for excessive wear. Repair or replace the
components that are not within the manufacturers specification. When components are reinstalled
into an engine, return the components to their original location, position and direction. During
assembly, lubricate all of the moving parts with clean engine oil or engine assembly lubricant
(unless otherwise specified). This will provide initial lubrication when the engine is first started.

BALANCE SHAFT BEARING INSTALLATION

Tools Required

J 44225 Balance Shaft Bearing Remover/Installer

2007 Hummer H3

2007 ENGINE Engine Mechanical - 3.7L - H3

Fig. 581: View Of Balance Shaft Journals
Courtesy of GENERAL MOTORS CORP.

Position the cylinder block so the cylinder head deck face is down and identify the following:

The left balance shaft bearings are in the shorter length balance shaft journal (3) and (4).

The right balance shaft - grooved bearings are in the longer length balance shaft journal (1)
and (2).

2007 Hummer H3

2007 ENGINE Engine Mechanical - 3.7L - H3

Fig. 582: Identifying Front & Rear Bearings
Courtesy of GENERAL MOTORS CORP.

Identify the following:

Bearings (2) and (3) are the front bearings and bearings (1) and (4) are the rear bearings.

The rear bearings (1) and (4) have a slightly larger diameter than the front bearings (2) and
(3). This allows for easier removal and installation of the front bearings. The rear bearings
also have notches on them for identification purposes.

Installation Procedure

2007 Hummer H3

2007 ENGINE Engine Mechanical - 3.7L - H3