Jeep 1997 Grand Cherokee Service Manual page 255

THREADED FAN BLADE ASSEM- NUT VISCOUS FAN DRIVE THREADED (WATER PUMP HUB) BLY P ULLEYBOLTS
ZG
REMOVAL AND INSTALLATION (Continued)
any of these conditions are found. Also check condi-
tion of the thermal viscous fan drive. Refer to Viscous
Fan Drive in this group.
The water pump can be removed without discharg-
ing the air conditioning system (if equipped).
REMOVAL
(1) Disconnect negative battery cable from battery.
(2) Drain cooling system. Refer to Draining Cool-
ing System in this group.
Do not waste reusable coolant. If solution is clean,
drain coolant into a clean container for reuse.
(3) The thermal viscous fan drive is attached
(threaded) to the water pump hub shaft (Fig. 32).
Remove fan/viscous fan drive assembly from water
pump by turning mounting nut counterclockwise 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 (Fig.
32) to prevent pulley from rotating. Do not attempt
to remove fan/viscous fan drive assembly from vehi-
cle at this time.
Fig. 32 Fan Blade and Viscous Fan Drive—5.2/
5.9LEngines
WARNING: CONSTANT TENSION HOSE CLAMPS
ARE USED ON MOST COOLING SYSTEM HOSES.
WHEN REMOVING OR INSTALLING, USE ONLY
TOOLS DESIGNED FOR SERVICING THIS TYPE OF
CLAMP, SUCH AS SPECIAL CLAMP TOOL (NUMBER
6094) (Fig. 29). SNAP-ON CLAMP TOOL (NUMBER
HPC-20) MAY BE USED FOR LARGER CLAMPS.
SHAFT CRANKSHAFT WATER PUMP
WATER
PUMP PUL-
LEY
BYPASS PULLEY HOSE HOOD CONDENSER BRACKET LATCH BOLT FAN SHROUD MOUNTING NUTS
ALWAYS WEAR SAFETY GLASSES WHEN SERVIC-
ING CONSTANT TENSION CLAMPS.
CAUTION: A number or letter is stamped into the
tongue of constant tension clamps (Fig. 30). If
replacement is necessary, use only an original
equipment clamp with matching number or letter.
(4) If water pump is being replaced, do not unbolt
fan blade assembly (Fig. 32) from thermal viscous
fan drive.
(5) Remove two fan shroud-to-radiator nuts (Fig.
33). Do not attempt to remove fan shroud at this
time.
(6) Remove fan shroud and fan blade/viscous fan
drive assembly from vehicle as a complete unit.
(7) After removing fan blade/viscous fan drive
assembly, do not place thermal viscous fan drive in
horizontal position. If stored horizontally, silicone
fluid in viscous fan drive could drain into its bearing
assembly and contaminate lubricant.
(8) Do not remove water pump pulley bolts at
this time.
(9) Remove accessory drive belt as follows: The
drive belt is equipped with a spring loaded automatic
belt tensioner (Fig. 34). Relax tension from belt by
rotating tensioner clockwise (as viewed from front)
(Fig. 34). When all belt tension has been relaxed,
remove accessory drive belt.
(10) Remove four water pump pulley-to-water
pump hub bolts (Fig. 32) and remove pulley from
vehicle.
BRACKET BOLT LOWER ALIGNMENT DOWELS
COOLING SYSTEM
Fig. 33 Fan Shroud Nuts
UPPER BRACE BOLTS CONDENSER BOLT
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