Dodge RAM TRUCK 1500 1995 Service Manual page 317

BR
COOLING SYSTEM SERVICE PROCEDURES 7 47
FAN BLADE
ASSEMBLY
THREADED
NUT
WATER
PUMP
PULLEY PULLEY
BOLTS
WATER PUMP
THREADED SHAFT
(WATER PUMP HUB)
VISCOUS FAN DRIVE
CRANKSHAFT
PULLEY
J9307-32
Fig. 68 Fan Blade/Viscous Fan Drive—Gas
Engines—Typical
(1) Remove fan blade and viscous fan drive as an
assembly from the engine. Refer to preceding Re­
moval procedure.
(2) Remove fan blade assembly from viscous fan
drive unit (four bolts).
(3) Lay fan on a flat surface with leading edge fac­
ing down. With tip of blade touching flat surface, re­
place fan if clearance between opposite blade and
surface is greater than 2.0 mm (.090 inch). Rocking
motion of opposite blades should not exceed 2.0 mm
(.090 inch). Test all blades in this manner.
WARNING;, DO NOT ATTEMPT TO B E N D OR
STRAIGHTEN FAN B L A D E S IF NOT WITHIN S P E C I ­
FICATIONS.
(4) Inspect fan assembly for cracks, bends, loose
rivets or broken welds. Replace fan if any damage is
found.
CAUTION: If fan blade assembly is replaced be­
cause of mechanical damage, water pump and vis­
cous fan drive should also be inspected. These
components could have been damaged due to ex­
cessive vibration.
INSTALLATION
(1) Install fan blade assembly to viscous fan drive.
Tighten bolts (Fig. 68) to 23 N-m (17 ft. lbs.) torque.
(2) Position fan shroud and fan blade/viscous fan
drive assembly to vehicle as a complete unit.
(3) Install fan shroud.
(4) Install fan blade/viscous fan drive assembly to
water pump shaft (Fig. 68).
(5) Except 8.0L V-10 Engine: Install coolant re­
serve/overflow tank to fan shroud. Snaps into posi­
tion.
(6) Install throttle cable to fan shroud.
(7) Connect negative battery cable.
COOLING SYSTEM FAN—DIESEL ENGINE
Also refer to the proceeding Viscous Fan Drive sec­
tion for additional information.
REMOVAL
(1) Disconnect both negative battery cables at both
batteries.
(2) Remove the fan shroud mounting bolts. Posi­
tion fan shroud towards engine.
CAUTION: Do not remove the fan pulley bolts. This
pulley is under spring tension.
(3) The thermal viscous fan drive/fan blade assem­
bly is attached (threaded) to the fan hub shaft (Fig.
69). Remove the fan blade/fan drive assembly from
fan pulley by turning the mounting nut clockwise (as
viewed from front). Threads on the viscous fan drive
are LEFT-HAND. A Snap-On 36 MM Fan Wrench
(number SP346 from Snap-On Cummins Diesel Tool
Set number 2017DSP) can be used. Place a bar or
screwdriver between the fan pulley bolts to prevent
pulley from rotating.
THREADED
SHAFT
FAN
BLADE
ASSEMBLY
THREADED
NUT
VISCOUS FAN DRIVE
FAN BLADE
BOLTS (4)
J9307-65
Fig. 69 Fan Blades/Viscous Fan Drive—5.9L Diesel
(4) Remove the fan shroud and the fan blade/vis­
cous drive as an assembly from vehicle.