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.
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