Hummer H1 (2006+). Manual — part 187

4-28

Cooling System

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pressure grease gun, to the joint slowly until old grease can be seen exiting around the sleeve on the shaft. Wipe the excess grease
from the shaft when finished(Figure 4-25).

NOTE: It will be normal for some grease to exit the CV joint seals during engine operation, DO NOT replace the CV joints for this
condition.

Figure 4-24: GFD Fill and Drain Plugs

Removal

1.

Drain the engine coolant.

2.

Remove the front driveline protection.

3.

Remove the front axle assembly (See section 9).

4.

Remove the lower coolant pipe.

5.

Remove the four bolts securing the GFD drive flange to the harmonic balancer (Figure 4-26).

6.

Remove the four bolts securing the fan and viscous drive assembly to the GFD.

7.

Use “bungee cords” to support the fan assembly for GFD removal.

8.

Remove the four bolts securing the GFD to the cross member and remove the GFD.

FILL

PLUG

DRAIN

PLUG

GEARED

FAN DRIVE

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Cooling System 4-29

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Figure 4-25: Coupler Shaft Grease Points

Installation

1.

Install the GFD in the cross member and secure with four bolts and torque to 44 lb ft (60 N•m).

2.

Secure the fan and viscous drive assembly to the GFD with four bolts and torque to 80-100 lb ft (108-135 N•m).

3.

Secure the GFD drive flange to the harmonic balancer and torque the bolts to 44 lb ft (60 N•m).

4.

Install the lower coolant pipe.

5.

Install the front axle assembly.

6.

Install the front driveline protection.

7.

Fill the cooling system with Dex Cool coolant.

GREASE

ZERKS

GREASE

ZERKS

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Cooling System

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Figure 4-26: Geared Fan Drive Assembly

GEARED FAN DRIVE SEAL REPLACEMENT

CAUTION: DO NOT lift the GFD with the oil pipe. It may induce oil leaks.

NOTE: The disassembly and assembly process will require the use of a good quality shop press, do not attempt this procedure
without the proper tools.

With the GFD removed from the vehicle and drained of fluid, place it on a clean work bench free of dirt and debris.

CROSS

MEMBER

VISCOUS

DRIVE

GFD

ASSEMBLY

GFD DRIVE FLANGE

TO HARMONIC BALANCER

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Cooling System 4-31

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Disassembly

1.

Remove the oil pipe (Figure 4-27).

Figure 4-27: Oil Pipe

2.

Remove the six bolts holding the sump assembly to the GFD and remove the sump.

OIL PIPE

FAN CASE

MAIN CASE

REAR CASE

OIL SUMP

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