Hummer H2. Manual — part 1862

7. If necessary, rotate the camshaft or crankshaft sprockets in order to align the timing marks.

8. Install the camshaft sprocket bolts.

Tighten: Tighten the camshaft sprocket bolts to 35 N.m (26 lb ft).

OIL PUMP, PUMP SCREEN AND DEFLECTOR INSTALLATION

Fig. 611: Oil Pump & Bolt
Courtesy of GENERAL MOTORS CORP.

NOTE:

Refer to Fastener Notice in Cautions and Notices.

IMPORTANT: Inspect the oil pump and engine block oil gallery passages. These

surfaces must be clear and free of debris or restrictions.

2004 Hummer H2

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

1. Align the splined surfaces of the crankshaft sprocket and the oil pump drive gear and install the oil pump.

2. Install the oil pump onto the crankshaft sprocket until the pump housing contacts the face of the engine

block.

3. Install the oil pump bolts.

Tighten: Tighten the oil pump bolts to 25 N.m (18 lb ft).

Fig. 612: Crankshaft Oil Deflector
Courtesy of GENERAL MOTORS CORP.

4. Install the crankshaft oil deflector.

NOTE:

Refer to Fastener Notice in Cautions and Notices.

2004 Hummer H2

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

Fig. 613: Oil Pump Screen, Bolt, Nuts & O-Ring Seal
Courtesy of GENERAL MOTORS CORP.

5. Lubricate a NEW oil pump screen O-ring seal (406) with clean engine oil.

6. Install the NEW O-ring seal onto the oil pump screen.

IMPORTANT:

z

Push the oil pump screen tube completely into the oil pump prior to
tightening the bolt. Do not allow the bolt to pull the tube into the
pump.

z

Align the oil pump screen mounting brackets with the correct
crankshaft bearing cap studs.

2004 Hummer H2

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

7. Install the oil pump screen (407).

8. Install the oil pump screen bolt (405) and the deflector nuts (404).

Tighten:

1. Tighten the oil pump screen bolt (405) to 12 N.m (106 lb in).

2. Tighten the crankshaft oil deflector nuts (404) to 25 N.m (18 lb ft).

ENGINE REAR COVER INSTALLATION

Tools Required

z

J 41480 Front and Rear Cover Alignment - Oil Pan Surface. See Special Tools and Equipment .

z

J 41476 Front and Rear Cover Alignment Tool - Crankshaft Oil Seal Area. See Special Tools and
Equipment .

2004 Hummer H2

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