Cooling System Fan 5.2/5.9L Engines - Jeep 1997 Grand Cherokee Service Manual

ZG
REMOVAL AND INSTALLATION (Continued)
(5) After removing fan blade/fan drive assembly do
not place the thermal viscous fan drive in the hori-
zontal position. If stored horizontally, the silicone
fluid in the viscous fan drive could drain into the
bearing assembly and contaminate the lubricant.
INSTALLATION
(1) Assemble fan blades to viscous fan drive.
Tighten mounting bolts to 24 N·m (18 ft. lbs.) torque.
(2) Position fan, viscous fan drive and fan shroud
to the engine as one assembly.
(3) Position fan shroud to radiator. Be sure the
alignment tabs at the lower part of shroud are placed
into the slots near lower part of radiator.
Be sure the upper and lower portions of the fan
shroud are firmly connected. All air must flow
through the radiator.
(4) Position mounting flange of fan/viscous fan
drive assembly onto water pump pulley. Install four
nuts and tighten to 24 N·m (18 ft. lbs.) torque.
(5) Install two fan shroud mounting nuts.
Be sure of at least 25 mm (1.0 inches) between tips
of fan blades and fan shroud.

COOLING SYSTEM FAN 5.2/5.9L ENGINES

REMOVAL
(1) Disconnect negative battery cable from battery.
(2) The thermal viscous fan drive/fan blade assem-
bly is attached (threaded) to water pump hub shaft
(Fig. 70). Remove fan blade/viscous fan drive assem-
bly from water pump by turning mounting nut coun-
terclockwise as viewed from front. Threads on
viscous fan drive are RIGHT HAND. A Snap-On 36
MM Fan Wrench (number SP346 from Snap-On
Cummins Diesel Tool Set number 2017DSP) can be
used. Place a bar or screwdriver between water
pump pulley bolts to prevent pulley from rotating.
(3) Do not attempt to remove fan/viscous fan drive
assembly from vehicle at this time.
(4) Do not unbolt fan blade assembly from viscous
fan drive at this time.
(5) Remove two fan shroud-to-upper crossmember
nuts (Fig. 69).
(6) Remove fan shroud and fan blade/viscous fan
drive assembly as a complete unit from vehicle.
(7) After removing fan blade/viscous fan drive
assembly, do not place viscous fan drive in horizon-
tal position. If stored horizontally, silicone fluid in
the viscous fan drive could drain into its bearing
assembly and contaminate lubricant.
CAUTION: Do not remove water pump pulley-to-
water pump bolts. This pulley is under spring ten-
sion.
THREADED NUT FAN BLADE ASSEM- VISCOUS FAN DRIVE THREADED (WATER PUMP HUB) BLY P ULLEYBOLTS
Fig. 70 Fan Blade/Viscous Fan Drive—5.2/5.9LV-8
(8) Remove four bolts securing fan blade assembly
to viscous fan drive.
INSTALLATION
(1) Install fan blade assembly to viscous fan drive.
Tighten bolts to 23 N·m (17 ft. lbs.) torque.
(2) Position fan shroud and fan blade/viscous fan
drive assembly to vehicle as a complete unit.
(3) Position fan shroud to radiator. Be sure the
alignment tabs at the lower part of shroud are placed
into the slots near lower part of radiator. Install and
tighten the two fan shroud-to-upper crossmember
mounting nuts.
Be sure of at least 25 mm (1.0 inches) between tips
of fan blades and fan shroud.
(4) Install fan blade/viscous fan drive assembly to
water pump shaft.
(5) Connect negative battery cable.
VISCOUS FAN DRIVE
REMOVAL/INSTALLATION
Refer to Cooling System Fan removal and installa-
tion procedures of the viscous fan drive unit proce-
dures.
Viscous Fan Drive Fluid Pump Out Requirement:
After installing a NEW viscous fan drive, bring the
engine speed up to approximately 2000 rpm and hold
for approximately two minutes. This will ensure
proper fluid distribution within the drive.
SHAFT CRANKSHAFT WATER PUMP
WATER
PUMP PUL-
LEY
COOLING SYSTEM
Engines
BYPASS PULLEY HOSE
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