Hummer H1 (2006+). Manual — part 29

2-22

Engine

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DIESEL ENGINE IN-VEHICLE SERVICE

General Information

The repair procedures described in this section cover engine service that can be performed in the vehicle. Engine removal is not re-
quired.

Left/Right Orientation

Left/right orientation throughout this section is from the driver seat. A left side location refers to the driver side of the vehicle and
a right side location to the passenger side.

ENGINE MOUNTING BRACKET/INSULATOR LEFT SIDE

Removal

1.

Remove the drive line protection.

2.

Remove the nuts/bolts attaching the front propeller shaft center bearing to the bracket.

3.

Support the engine with a floor jack and a wood block or a safety stand if the vehicle is on a hoist. Position the block or the
stand under the oil pan rail at the rear main.

4.

Remove the nuts/bolts attaching the insulator bracket to the frame and the insulator from the engine block.

5.

Remove the insulator from the vehicle and the bolts securing the insulator to the bracket.

Installation

1.

Secure the new engine insulator to the bracket with the bolts and tighten to 48 lb-ft. (65N•m).

2.

Start the nuts/bolts attaching the insulator bracket to the frame and the insulator to the engine block.

3.

Tighten the nuts/bolts attaching the insulator bracket to the frame to 90 lb-ft. (122N•m).

4.

Tighten the nuts/bolts attaching the insulator to the engine block to 43 lb-ft. (58N•m).

5.

Tighten the center bearing attaching bolts to 60 lb-ft. (81 N•m).

6.

Install the drive line protection.

ENGINE MOUNTING INSULATOR RIGHT SIDE

Removal

1.

Remove the drive line protection.

2.

Support the engine with a floor jack and a wood block or a safety stand if the vehicle is on a hoist. Position the block or the
stand under the oil pan rail at the rear main.

3.

Remove the nuts/bolts attaching the insulator to the insulator bracket.

4.

Remove the nuts/bolts attaching the insulator to the engine block.

5.

Remove the insulator through the opening between the body and the top of the frame.

Installation

1.

Position the new engine insulator in to place.

2.

Start the nuts/bolts attaching the insulator to the bracket and the insulator to the engine block.

3.

Tighten the nuts/bolts attaching the insulator to the bracket to 48 lb-ft. (65 N•m).

4.

Tighten the nuts/bolts attaching the insulator to the engine block to 43 lb-ft. (58 N•m).

5.

Install the drive line protection.

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Engine 2-23

5745804

CRANKSHAFT BALANCER

Removal

1.

Disconnect the negative battery cable.

2.

Remove the drive line protection.

3.

Remove the bolts attaching the geared fan drive (GFD) shaft to the crankshaft balancer.

4.

Remove the starter motor bolts. Reposition the starter aside. The wiring to the starter does not require removal.

5.

Use essential tool J-44643 in order to hold the flywheel to prevent engine from rotating.

6.

Position the GFD shaft out of the way to gain access to the crank shaft balancer bolt.

7.

Loosen (but do not remove) the crankshaft balancer bolt (Figure 2-11).

8.

Remove the serpentine accessory drive belt as follows:

a.

Loosen the drive belt by rotating the belt tensioner in a counterclockwise direction. Use essential tool EN-47913 to rotate
the pulley.

b.

Slide the belt off the tensioner and the other pulleys. Then remove the belt.

9.

Remove the crankshaft balancer bolt and the crankshaft balancer.

Figure 2-11: Crankshaft Balancer Mounting

Crankshaft Balancer Inspection

1.

Clean the crankshaft balancer.

2.

Inspect the crankshaft balancer for damage to the belt drive surface and to crankshaft balancer hub.

3.

Inspect the balancer hub slot and the keyway for damage or wear.

4.

Replace the crankshaft balancer or the keyway if any concerns exist.

Installation

1.

Lubricate the crankshaft balancer internal hub with clean engine oil.

2.

Install the crankshaft balancer on the crankshaft.

3.

Lubricate the crankshaft balancer bolt with clean engine oil.

4.

Install the crankshaft balancer bolt and the washer.

5.

Tighten the crankshaft balancer bolt to 260 lb-ft. (353þN·m).

6.

Remove J 44643 tool from the flywheel.

7.

Position the starter motor in place and tighten the starter bolts to 58 lb ft. (78 N•m).

8.

Install the serpentine belt on all the pulleys except the belt tensioner (Figure 2-12). Turn the tensioner counterclockwise with
essential tool EN-47913 and slide the belt onto the tensioner. Then release essential tool EN-47913 so the tensioner can rotate
clockwise to adjust the belt.

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2-24

Engine

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9.

Install the bolts attaching the geared fan drive (GFD) shaft to the crankshaft balancer and tighten to 37 lb-ft. (50 N•m).

10. Install the drive line protection.

11. Connect the negative battery cable.

Figure 2-12: Serpentine Belt Installation

FRONT COVER OIL SEAL REPLACEMENT

1.

Remove the crankshaft balancer (See “Crankshaft Balancer” on page 2-23) .

2.

Remove the oil seal from the front cover with tool J

–

44644.

3.

Clean the front crankshaft seal bore and the crankshaft.

4.

Lubricate the crankshaft sealing surface with clean engine oil.

5.

Place the crankshaft front oil seal onto the crankshaft.

6.

Install tool J–44645 to the crankshaft.

7.

Press the crankshaft front oil seal onto the crankshaft using J–44645 until the tool bottoms out (Figure 2-13). Then remove the
tool.

8.

Install crankshaft balancer and the serpentine belt.

Figure 2-13: Front Cover Crankshaft Seal Installation

CRANKSHAFT

PULLEY

GENERATOR

PULLEY

TENSIONER

PULLEY

A/C COMPRESSOR

OR IDLER PULLEY

SERPENTINE

BELT

POWER

STEERING

PUMP

PULLEY

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Engine 2-25

5745804

REAR MAIN OIL SEAL REPLACEMENT

Removal

1.

Remove the transmission and the transfer case assembly.

2.

Remove the flywheel.

CAUTION: Do not nick or scratch the crankshaft seal surface when removing the old seal.

3. Remove the rear main seal using tools J-44641, J-44641-1 and J-44641-2 (Figure 2-14).

Figure 2-14: Rear Main Oil Seal Removal

Installation

1.

Install the new rear main seal using tool J-44642.

2.

Install the flywheel.

3.

Install the transmission and the transfer case assembly.

Figure 2-15: Rear Main Oil Seal Installation

TOOLS J–44641, J–44641-1

AND J–44641-2

TOOL J–44642

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