Electric Cooling Fan
REMOVALFan belt removal is not necessary to remove cooling system fan.
(1) Disconnect the negative battery cable at battery.
(2) Remove the plastic air cleaner intake tube.
(3) Remove two-piece fan shroud. Remove lower half first.
(4) The thermal viscous fan drive/fan blade assembly is attached (threaded) to the water pump hub shaft. Remove the fan blade/fan drive assembly from water pump by turning the mounting nut counterclockwise (as viewed from front). Threads on the viscous fan drive are RIGHT HAND. A Snap-On 36 MM Fan Wrench (number SP346 from Snap-On Cummins Diesel Tool Set number 2017DSP) can be used with Special Tool 6958 Spanner Wrench and Adapter Pins 8346 to prevent the pulley from rotating.
Do not unbolt fan blade assembly from the viscous fan drive at this time.
(5) After removing fan blade/fan drive assembly do not place the thermal viscous fan drive in the horizontal position. If stored horizontally, the silicone fluid in the viscous fan drive could drain into its bearing assembly and contaminate the bearing lubricant.
(6) Remove the four bolts securing the fan blade assembly to the viscous fan drive.
INSTALLATION
(1) Install fan blade assembly to viscous fan drive. Tighten bolts to 23 Nm (17 ft. lbs.) torque.
(2) Install the fan blade/viscous fan drive assembly to water pump shaft.
(3) Install fan shroud.
(4) Install air cleaner intake tube.
(5) Connect negative battery cable.
VISCOUS FAN DRIVE
Viscous Fan Drive Fluid Pump Out Requirement: After installing a new viscous fan drive, bring the engine speed up to approximately 2000 rpm and hold for approximately two minutes. This will ensure proper fluid distribution within the drive.