Hummer H1 (1992-1998). Instruction - page 46

2-39. WATER CROSSOVER REPAIR (Cont’d)

CAUTION

Thermostat must be installed correctly or engine damage may
result.

For general assembly instructions, refer to para. 2-12.

1. Install thermostat (9), gasket (8), and water outlet (7) on water crossover (11) with two washers (4),

capscrew (6), and stud (5). Tighten capscrew (6) and stud (5) t

O

25 lb-ft (34 N•m).

2. Coat threads on heater hose nipple (12), bypass hose nipple (10), and de-airation nipple (2) with

pipe sealing compound and install in water crossover (11).

3. Coat threads on glow plug controller (1) and temperature switch (3) with pipe sealing compound

and install in water crossover (11).

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2-40. FAN DRIVE REPAIR

This task covers:

a. Disassembly

c. Inspection

b. Cleaning

d. Assembly

INITIAL SETUP

Tools

General mechanic’s tool kit:

automotive (Appendix E, Item 1)

Materials/Parts

Locknut (Appendix D, Item 24)
Spring (Appendix D, Item 50)
Two shaft O-rings (Appendix D,
Items 32 or 33)
Friction lining (Appendix D, Item 23)
Cylinder O-ring (Appendix D, Item 30)
Dust seal (Appendix D, Item 42)
Lithium grease (Appendix B, Item 11)

Manual References

Personnel Required

One mechanic
One assistant

Equipment Condition

Engine disassembled into subassemblies (para. 2-15).

General Safety Instructions

Use eyeshields when cleaning with compressed air.

Do not use compressed air to spin bearings.

a. Disassembly

1. Remove six screws (8) and three retaining plates (9) from housing (5).
2. Remove friction lining (10) from housing (5). Discard friction lining (10).

3. Remove locknut (1) and tabwasher (2) securing shaft assembly (11) and cylinder assembly (3)

to housing (5). Discard locknut (1).

4. Remove cylinder assembly (3) from front of housing (5).

5. Remove O-ring (4) from inside cylinder assembly (3). Discard O-ring (4).
6. Remove shaft assembly (11) and spring (6) from housing (5). Discard spring (6).
7. Remove two O-rings (7) from shaft assembly (11). Discard O-rings (7)-

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2-40. FAN DRIVE REPAIR (Cont’d)

2-40. FAN DRIVE REPAIR (Cont’d)

WARNING

Compressed air used for cleaning purposes will not exceed 30 psi

(207 kPa).

Use

only with effective chip guarding and personal

protective equipment (goggles/shield, gloves, etc.).

Do not use compressed air to spin bearings. Spinning a dry

bearing with compressed air may cause injury to personnel or
damage to equipment.

1. Clean shaft assembly (7) and housing (2) with compressed air and wipe with clean cloth.

2. Clean all other parts in accordance with para. 2-9.

c. Inspection

NOTE

For general inspection instructions, refer to para. 2-10.

1. Inspect cylinder assembly (9) for damage. Replace if damaged.

2. Inspect dust seal (10) for cracks in the seal or pieces missing from it. Replace dust seal (10) if

cracked or pieces missing from it. Ensure lip of seal is facing out.

3. Inspect roller bearings (3) and (4) in housing assembly (2) for damage. Replace fan drive assembly

if damaged.

4. Inspect lip seal (5) in housing assembly (2) for damage. Replace fan drive assembly if damaged.
5. Inspect studs (1) on housing assembly (2) for stripped threads. Replace if damaged.
6. Inspect seal surface (6) on shaft assembly (7) for damage. Replace fan drive assembly if damaged.
7. Inspect bearing (8) on shaft assembly (7) for damage. Replace fan drive assembly if damaged.

2-150

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