Chrysler Vehicle User Manual page 308

TJ
WATER PUMP - 2.4L (Continued)
Fig. 27 Water Pump Body
1 - IMPELLER
2 - WATER PUMP BODY
3 - O-RING LOCATING GROOVE
(4) Rotate pump by hand to check for freedom of
movement.
(5) Fill cooling system (Refer to 7 - COOLING/EN-
GINE - STANDARD PROCEDURE). Pressurize cool-
ing system to 103 Kpa (15 psi) with pressure tester
and check water pump shaft seal and O-ring for
leaks.
(6) Install rear timing belt cover and camshaft
sprockets (Refer to 9 - ENGINE/VALVE TIMING/
TIMING BELT AND SPROCKETS - INSTALLA-
TION).
(7) Install timing belt (Refer to 9 - ENGINE/
VALVE TIMING/TIMING BELT AND SPROCKETS -
INSTALLATION).
WATER PUMP - 4.0L
DESCRIPTION
CAUTION: The 2.5L 4-cylinder and the 4.0L 6-cylin-
der engines are equipped with a reverse (counter-
clockwise) rotating
viscous fan drive assembly. REVERSE is stamped
or imprinted on the cover of the viscous fan drive
and inner side of the fan. The letter R is stamped
into the back of the water pump impeller. Engines
from previous model years, depending upon appli-
cation, may have been equipped with a forward
(clockwise) rotating water pump. Installation of the
wrong water pump or viscous fan drive will cause
engine over heating.
water pump and
This aluminum water pump (Fig. 28) is the heart
of the cooling system. The water pump is located at
the front of the cylinder block, above the timing
chain cover
The water pump impeller is pressed onto the rear
of a shaft that rotates in bearings pressed into the
housing. The housing has two small holes to allow
seepage to escape. The water pump seals are lubri-
cated by the antifreeze in the coolant mixture. No
additional lubrication is necessary.
1 - HEATER HOSE FITTING BORE
2 - WATER PUMP
3 - WATER PUMP HUB
OPERATION
A centrifugal
through the water jackets, passages, intake manifold,
radiator core, cooling system hoses and heater core.
The pump is driven from the engine crankshaft by a
single serpentine drive belt on all engines.
REMOVAL
The water pump can be removed without discharg-
thermal
ing the air conditioning system (if equipped).
CAUTION: All engines have a reverse (counterclock-
wise) rotating water pump. The letter R is stamped
into the back of the water pump impeller (Fig. 29) to
identify. Engines
depending upon application, may be equipped with
a forward (clockwise) rotating water pump. Installa-
tion of the wrong water pump will cause engine
over heating.
ENGINE
Fig. 28 Water Pump
water pump circulates
from previous model
7 - 39
coolant
years,