Dodge RAM TRUCK 1500 1995 Service Manual page 292

7 - 22 COOLING SYSTEM SERVICE PROCEDURES
B R
AUTOMATIC
TENSIONER
J9307-56
Fig. 12 Belt Routing—5.9L HDC-Gas Engine—
Without A/C
radiator core, cooling system hoses and heater core.
The pump is driven from the engine crankshaft by a
drive belt.
The water pump impeller is pressed onto the rear
of a shaft that rotates in a bearing pressed into the
water pump body. The body has a small hole for ven­
tilation. The water pump seals are lubricated by an­
tifreeze in the coolant mixture. Additional lubrication
is not necessary.
A quick test to determine if pump is working is to
check if heater warms properly. A * defective water
pump will not be able to circulate heated coolant
through the long heater hose to the heater core.
REMOWAL
The water pump on all models can be removed
without discharging the air conditioning system (if
equipped).
The water pump on all gas powered engines is
bolted directly to the engine timing chain case/cover.
On the 8.0L V-10 engine, a rubber o-ring (instead
of a gasket) is used as a seal between the water
pump and timing chain case/cover.
If water pump is replaced because of bearing/shaft
damage or leaking shaft seal, the mechanical cooling
fan assembly should also be inspected. Inspect for fa­
tigue cracks, loose blades or loose rivets that could
have resulted from excessive vibration. Replace fan if
any of these conditions are found. Also check condi­
tion of the thermal viscous fan drive. Refer to Viscous
Fan Drive in this group.
(1) Disconnect negative battery cable from battery.
(2) Drain cooling system. Refer to Draining Cooling
System in this group.
Do not waste reusable coolant. If solution is clean,
drain coolant into a clean container for reuse.
(3) Remove windshield washer reservoir tank from
radiator fan shroud. Refer to Group 8K, Windshield
Wiper and Washer Systems.
(4) Remove the four fan shroud mounting bolts at
the radiator (Fig. 13). Do not attempt to remove
shroud from vehicle at this time.
RADIATOR
FAN SHROUD MOUNTING BOLTS J9407-37
Fig. 13 Typical Fan Shroud Mounting
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. 14). SNAP-ON CLAMP TOOL (NUMBER
HPC-20) MAY BE USED FOR LARGER CLAMPS. AL­
WAYS WEAR SAFETY GLASSES WHEN SERVICING
CONSTANT TENSION CLAMPS.
CAUTION: A number or letter is stamped into the
tongue of constant tension clamps (Fig. 15). If re­
placement is necessary, use only an original equip­
ment clamp with a matching number or letter.
(5) Remove upper radiator hose at radiator.
(6) The thermal viscous fan drive is attached
(threaded) to the water pump hub shaft (Fig. 16). Re­
move the fan/fan drive assembly from water pump by
turning the mounting nut counterclockwise (as
viewed from front). Threads on the fan drive are
RIGHT-HAND. A Snap-On 36 MM Fan Wrench
(number SP346 from Snap-On Cummins Diesel Tool