Service Procedure
1. Open the hood.2. Obtain a 36 mm fan clutch wrench that is approximately 14" long and that has a square 1/2" drive hole to attach a torque wrench (OTC P/N 7204E2, Snap-on P/N YA9325-1, K-D P/N 3136-76 or MAC P/N FCW3260A). If one of the listed fan clutch wrenches is not readily available, modify the fan clutch wrench from the Cummins Diesel Essential Tool Kit (P/N SP346) as follows:
a. Remove the red plastic handle cover.
b. Mark and center punch a point on the handle that is 12" (300 mm) from the deepest point of the open end (Figure 1).
c. Using a 7/16" drill bit, drill a hole at the marked location.
d. In stall a 10-mm bolt and nut combination (PN 06506019AA and PN 06502696 or equivalents) in the handle hole (Figure 1). Tighten the bolt and nut to 75 ft-lbs (102 N.m).
3. Using the fan clutch wrench, rotate the radiator cooling fan until the tool handle is approximately vertical.
4. Connect a "clicker" torque wrench to the fan clutch wrench so that the torque wrench and the fan clutch wrench are in a straight line Set the torque wrench to 42 ft-lbs (57 N.m). (This will achieve 85 ft-lbs at the cooling fan nut.)
IMPORTANT:
The torque wrench and the fan clutch wrench MUST be in a straight line to achieve the proper torque measurement.
NOTE:
If using the modified special tool SP346, attach the torque wrench to the bolt that was installed in the handle, with a socket.
5. Place a large screwdriver or small pry bar across two of the pulley bolts as shown in Figure 2.
6. While holding the pulley in place with the screwdriver, tighten the cooling fan nut with the torque wrench/fan clutch wrench set to 42 ft-lbs (57 N.m) (Figure 3). This will achieve 85 ft-lbs at the cooling fan nut.
NOTE:
Turn the nut clockwise, as viewed from the front of the vehicle to tighten.
CAUTION:
The pulley must be held in place. Belt friction alone will not allow the nut to be tightened sufficiently.
7. Remove the torque wrench/fan clutch wrench assembly and the screwdriver.
8. Close the hood.