Hi:
Here is what my FSM says for my '98 model.
VISCOUS FAN/DRIVE—3.9L/5.2L/5.9L ENGINES
REMOVAL
(1) Disconnect battery negative cable.
(2) The thermal viscous fan drive/fan blade assembly is attached (threaded) to
water pump hub shaft. Remove fan blade/viscous fan drive assembly from water
pump by turning mounting nut counterclockwise as viewed from front. Threads on
viscous fan drive are RIGHT HAND. A Snap-On 36 MM Fan Wrench (number SP346 from
Snap-On Cummins Diesel Tool Set number 2O17DSP) can be used. Place a bar or
screwdriver between water pump pulley bolts to prevent pulley from rotating.
(3) Do not attempt to remove fan/viscous fan drive assembly from vehicle at
this time.
(4) Do not unbolt fan blade assembly from viscous fan drive at this time.
(5) Remove fan shroud attaching hardware (two bolts at bottom-two clips at
top).
(6) Remove fan shroud and fan blade/viscous fan drive assembly as a complete
unit from vehicle.
(7) After removing fan blade/viscous fan drive assembly, do not place viscous
fan drive in horizontal position. If stored horizontally, silicone fluid in the
viscous fan drive could drain into its bearing assembly and contaminate
lubricant.
CAUTION: Do not remove water pump pulley-to-water pump bolts. This pulley is
under spring tension.
(8) Remove four bolts securing fan blade assembly to viscous fan drive.
INSTALLATION
(1) Install fan blade assembly to viscous fan drive. Tighten bolts to 23 Nm (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 and
tighten bolts to 27 Nm (20 ft. Lbs.).
(5) Connect battery negative cable.
In article <ccjuev$8no$1@bent.twistedbits.net>, david.clement@verizon.net
writes:
>
>
> Last week I started loosing coolant and it intially appeared to be coming
from
> the water pump seal so i picked up a new pump and was prepared to replace it.
> Once I got into the disassembly some it turned out to be the by-pass hose had
a
> pin hole and the coolant wasrunning down the front of the pump and was being
> flung by the pulley. Easy fix and back on the road in a hour. :)
>
> Anyway, now for the clutch fan questions (Oh Yea, 99 Magnum 3.9);
>
> 1. How does one hold the water pump from truning so you can loosen the large
> nut that holds the clutch fan assembly to the water pump? Looks like you need
> to use some sort of strap wrench to hold the pulling but it seems like it's
> likely to slip if the nut is tight. What has the group done to take this
apart?
>
> 2. The shaft going inside the clutch on my truck has quite a bit of slop in
it
> (out at the fan blade tips you can rock them forward and back about 3/8".
> Doesn't seem to wobble when running and there is no fluid leaking from the
> clutch but I am concerned that the clutch is not releasing when it should.
Any
> words of wisdom?
>
> Thanks in advance!
>
> Dave Clement
> 99 SLT+ CC 4x4
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