Chrysler RAM TRUCK 2500 1994 Service Manual page 272

CAUTION: A number or letter is stamped into t h e
tongue of constant tension clamps (Fig. 3). If re­
placement is necessary, u s e only an original equip­
ment clamp with a matching number or letter.
(6) Remove upper radiator hose at radiator.
HOSE CLAMP
TOOL 6094
HOSE
CLAMP
J9207-36
Fig. 2 Hose damp Tool—Typical
TYPICAL
CONSTANT
T E N S I O N HOSE
CLAMP
TYPICAL
HOSE
CLAMP
NUMBER/LETTER
LOCATION J9407-39
Fig. 3 Clamp Number/Letter Location
(7) The thermal viscous fan drive is attached
(threaded) to the water pump hub shaft (Fig. 4). 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
R I G H T H A N D . A Snap-On 36 M M Fan Wrench
(number SP346 from Snap-On Cummins Diesel Tool
Set number 2017DSP) can be used. Place a bar or
screwdriver between the water pump pulley bolts
(Fig. 4) to prevent the pulley from rotating.
I f water pump is being replaced, do not unbolt fan
blade assembly (Fig. 4) from the thermal control fan
drive.
(8) Remove fan blade/fan drive and fan shroud as
an assembly from vehicle.
After removing fan blade/fan drive assembly, do
not place the thermal viscous fan drive i n the hori­
zontal position. I f stored horizontally, the silicone
fluid i n the viscous drive could drain into its bearing
assembly and contaminate the bearing lubricant.
Do not remove the water pump pulley bolts at this
time.
F A N BLADE
ASSEMBLY
WATER
PUMP
PULLEY
WATER PUMP
THREADED
NUT
THREADED SHAFT
(WATER PUMP HUB)
VISCOUS FAN DRIVE
CRANKSHAFT
PULLEY
J9307-32
Fig. 4 Fan Blade and Viscous Fan Drive—Typical .
(9) Remove accessory drive belt as follows: The
drive belt is equipped with a spring loaded automatic
tensioner (Figs. 5 or 6).
3.9L V-6 or 5.2/5.9L V-8 LDC-Gas Engines: Relax
the tension from the belt by rotating the tensioner
clockwise (as viewed from front) (Fig. 5). When all
belt tension has been relaxed, remove accessory drive
belt.
5.9L HDC-Gas Engine: Relax the tension from the
belt by rotating the tensioner counterclockwise (as
viewed from front) (Fig. 6). When all belt tension has
been relaxed, remove accessory drive belt.
(10) Remove the four water pump pulley-to-water
pump hub bolts (Fig. 4) and remove pulley from ve­
hicle.
(11) Remove the lower radiator hose and heater
hose from water pump.
(12) Loosen heater hose coolant return tube
mounting bolt (Figs. 7 or 8) and remove tube from
water pump. Discard the old tube O-ring.
(13) Remove the seven water pump mounting bolts
(Fig. 9).