B350 1 Ton Van V8-5.9L VIN Z (1992)
Clamp Number/Letter Location
CAUTION: A number or letter is stamped into the tongue of constant tension clamps. If replacement is necessary, use only an original equipment
clamp with matching number or letter.
6. Remove upper radiator hose at radiator.
Fan Blade/Viscous Fan Drive Assembly
7. The thermal viscous fan drive is attached (threaded) to the water pump hub shaft. Remove the fan/fan drive assembly from water pump by turning
the mounting nut counterclockwise (as viewed from front). Threads on the fan drive are RIGHT RAND. A Snap-On 36 MM Fan Wrench
(number SP346 from Snap-On Cummins Diesel Tool Set number 2017D5P) can be used. Place a bar or screwdriver between the water pump
pulley bolts to prevent the pulley from rotating.
8. If water pump is being replaced, do not unbolt fan blade assembly from the thermal viscous fan drive.
9. Remove fan blade/fan drive assembly from vehicle.
10. 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 drive could drain into its bearing assembly and contaminate the bearing lubricant.
11. Do not remove the water pump pulley bolts at this time.
