REMOVAL & INSTALLATION
| WARNING | Vehicles are equipped with air bag supplemental restraint system. Before attempting any repairs involving steering column, instrument panel or related components, see SERVICE PRECAUTIONS and DISABLING & ACTIVATING AIR BAG SYSTEM in appropriate AIR BAG RESTRAINT SYSTEMS article. |
| CAUTION | When battery is disconnected, vehicle computer and memory systems may lose memory data. Driveability problems may exist until computer systems have completed a relearn cycle. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION before disconnecting battery. |
Note. For more information, refer to VISCOUS FAN DRIVE .
Fan belt is not necessary to remove cooling system fan.
- Disconnect the negative battery cable at battery.
- Remove the plastic air cleaner intake tube.
- Remove two-piece fan shroud. (Scheme 1) Remove lower half first.
- The thermal viscous fan drive/fan blade assembly is attached (threaded) to the water pump hub shaft. (Scheme 2) 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. Place a bar or screwdriver between the water pump pulley bolts to prevent the pulley from rotating. (Scheme 2)
- 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.
- Remove the 4 bolts securing the fan blade assembly to the viscous fan drive.
- To install, reverse removal procedures. Tighten bolts to 23 N.m (17 ft. lbs.).
Scheme 1
Scheme 2
See COOLING SYSTEM FAN for removal and installation procedures of the viscous drive unit.
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 2 minutes. This will ensure proper fluid distribution within the drive.