Cleaning And Inspection; Water Pump; Radiator Cleaning; Fan Blade - Jeep 1997 Grand Cherokee Service Manual

7 - 24 COOLING SYSTEM
REMOVAL AND INSTALLATION (Continued)
Fig. 25 Coolant Tube at Water Pump
(4) Position the metal coolant tube and its mount-
ing bracket to the pump.
(5) Install the four water pump mounting bolts.
Tighten bolts to 24 N·m (18 ft. lbs.) torque.
(6) Install drain hose to vent tube at bottom of
pump.
(7) Position the water pump pulley to the water
pump.
(8) Install the water pump pulley bolts finger
tight.
(9) Install the rubber coolant hose near the ther-
mostat.
(10) Install the drive belt and belt tensioner. For
procedures, refer to Belt Removal/Installation in the
Engine Accessory Drive Belts section of this group.
(11) Tighten the water pump pulley bolts to 24
N·m (18 ft. lbs.) torque.
(12) Position the viscous drive/fan blade and fan
shroud to the engine compartment as one assembly.
(13) Install the thermal viscous fan drive and fan
blade to fan pulley. Tighten to 56 N·m (41 ft. lbs.)
torque.
(14) Install and tighten fan shroud mounting bolts
to 3 N·m (31 in. lbs.) torque.
(15) Fill cooling system with coolant and check for
leaks. Refer to Refilling Cooling System in this
group.
(16) Connect battery cable to battery.
(17) Start and warm the engine. Check for leaks.

CLEANING AND INSPECTION

WATER PUMP

INSPECTION
Replace the water pump assembly if it has any of
the following conditions:
• The body is cracked or damaged
• Water leaks from the shaft seal. This is evident
by traces of coolant below the vent tube drain hose
• Loose or rough turning bearing.
• Impeller rubs either the water pump body or
water pump adapter.

RADIATOR CLEANING

The radiator and air conditioning fins should be
cleaned when an accumulation of bugs, leaves etc.
has occurred. Clean radiator fins are necessary for
good heat transfer. With the engine cold, apply cold
water and compressed air to the back (engine side) of
the radiator to flush the radiator and/or A/C con-
denser of debris.

FAN BLADE

INSPECTION
The fan cannot be repaired. If fan is damaged, it
must be replaced. Inspect fan as follows:
(1) Remove fan blade and viscous fan drive as an
assembly from the engine.
Fig. 26 Thermal Viscous Fan Drive and Blade
Assembly
(2) Remove fan blade assembly from viscous fan
drive unit (four bolts) (Fig. 26).
(3) Lay fan on a flat surface with leading edge fac-
ing down. With tip of blade touching flat surface,
replace fan if clearance between opposite blade and
surface is greater than 2.0 mm (.090 inch). Rocking
ZG