Hummer H1 Service Manual page 199

4-16 Cooling System
SERPENTINE BELT REPLACEMENT
1. Insert square lug of half-inch drive breaker bar in belt ten-
sioner. Then move tensioner counterclockwise to loosen
belt (Figure 4-32).
2. Remove belt from pulleys (Figure 4-33).
3. Position half-inch drive breaker bar in belt tensioner and
move tensioner counterclockwise and position serpentine
belt on pulleys as shown (Figure 4-33).
4. Release belt tensioner. Tensioner will automatically set
belt tension when released.
GENERATOR
PULLEY BELT TENSIONER
AND PULLEY
VACUUM
PUMP
CRANKSHAFT
PULLEY
Figure 4-32: Serpentine Belt Tensioner Location
TENSIONER
GENERATOR
PULLEY
PULLEY
VACUUM PUMP
CRANKSHAFT
PULLEY
Figure 4-33: Serpentine Belt Routing
__________________________________________________________
A/C COMPRESSOR
(OR IDLER PULLEY
WITHOUT A/C)
WATER PUMP
PULLEY
SERPENTINE
BELT
POWER STEERING
PUMP PULLEY
A/C COMPRESSOR
OR IDLER PULLEY
SERPENTINE
WATER
PUMP
PULLEY
FAN AND CLUTCH ASSEMBLY SERVICE
Removal
1. Insert spanner J–41240-1 in holes in water pump pulley
(Figure 4-34).
2. Use the spanner to hold the water pump shaft and wrench
J–41240-5A to break the nut loose securing the fan clutch
to the water pump.
3. Remove bolts attaching fan to fan clutch.
4. Remove fan clutch-to-water pump nut.
5. Remove fan and clutch from water pump.
Installation
6. Slide fan onto clutch and install bolts finger tight.
7. Install fan and clutch assembly on water pump shaft
(Figure 4-34).
8. Hold water pump shaft with spanner J–41240-1 and
tighten clutch nut to 80-100 lb-ft (108-135 N•m) with
wrench J–41240-5A.
9. Torque fan bolts to 15-20 lb-ft (20-27 N•m).
WRENCH
CLUTCH
BELT
POWER
STEERING
PUMP
PULLEY
Figure 4-34: Fan and Clutch Assembly
FAN
WATER
PUMP
PULLEY
®
SPANNER