Chrysler RAM TRUCK 2500 1994 Service Manual page 277

7 - 22 COOLING SYSTEM
•
(10) Remove the lower radiator hose at water
pump.
(11) Remove heater hose at water pump fitting.
(12) Remove the seven water pump mounting bolts
(Fig. 18).
J9407-19
Fig. 18 Water Pump Bolts—8.0L ¥-10—Typical
(13) Loosen the- clamp at the water pump end of
bypass hose. Slip the bypass hose from the water
pump while removing pump from vehicle. Do not re­
move the clamp from the bypass hose.
(14) Discard the water pump-to-timing chain/case
cover O-ring seal (Fig. 19).
WATER PUMP
O - R I N G
SEAL
J9407-18
Fig. 19 Water Pump O-Ring Seal—8.0L ¥-10
(15) Remove the heater hose fitting from water
pump i f pump replacement is necessary. Note posi­
tion (direction) of fitting before removal. Fitting must
be re-installed to same position.
CAUTION: Do not pry the water pump at timing
chain case/cover. The machined surfaces may be
damaged resulting in leaks.
INSPECTION
Replace water pump assembly i f i t 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 hole
• Loose or rough turning bearing. Also inspect ther­
mal fan drive
• Impeller rubs either the pump body or timing
chain case/cover
INSTALLATION
(1) I f water pump is being replaced, install the
heater hose fitting to the pump. Tighten fitting to 16
N-m (144 in. lbs.) torque. After fitting has been
torqued, position fitting as shown i n figure 20. When
positioning fitting, do not back off (rotate counter­
clockwise). Use a sealant on the fitting such as Mo­
par™ Thread Sealant With Teflon. Refer to the
directions on the package.
CAUTION: This heater hose fitting must be installed
to pump before pump is installed to engine.
HEATER
HOSE
FITTING
WATER
PUMP
FRONT
J9407-17
Fig. 20 Heater Hose Fitting Position—8.0L ¥-10
(2) Clean the O-ring mating surfaces at rear of wa­
ter pump and front of timing chain/case cover.
(3) Apply a small amount of petroleum jelly to O-
ring (Fig. 19). This will help retain O-ring to water
pump.