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TSB 07-09-98

Viscous Fan Drive Service

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Geno's Garage Truck Accessories

Date: Dec 18, 1998

Models: 1998-1999 BR/BE Ram with 3.9, 5.2 or 5.9 gas engine AFTER Jan 5, 1998 (MDH 0105XX)

1998-1999 (AB) Ram Van
1998-1999 (AN) Dakota
1998-1999 (BR/BE) Ram Truck
1999 (DN) Durango
1999 (TJ) Wrangler
1999 (XJ) Cherokee
1998-1999 (WJ) Grand Cherokee
1998-1999 (ZG) Grand Cherokee - international market

NOTE: Applies to vehicles equipped with 3.9, 5.2 or 5.9 gas engine AFTER Jan 5, 1998 (MDH 0105XX)

Discussion:
Vehicles built after Jan 5, 1998 have the water pump pulley pressed onto the water pump hub shaft. As in previous models, the viscous fan drive is threaded onto the water pump hub shaft. Because the pulley is pressed onto the hub shaft, viscous fan drive removal/installation procedures are unique.

The fan/viscous fan drive assembly can be removed or installed from the water pump by turning the mounting nut. To remove the fan/viscous fan drive assembly, turn the nut counterclockwise as viewed from the front.  To install the fan/viscous fan drive assembly, turn the nut clockwise as viewed from the front.  Threads on the viscous fan drive are RIGHT-HANDED. A 36 mm Fan wrench (Snap-On number SP346 from Snap-On Cummins Diesel Tool Set 201DSP) can be used to remove/install the fan drive assembly on gasoline engines. To hold the water pump pulley from rotating, place Miller Special Tool 6958 Spanner Wrench onto the water pump pulley with adapter pins 8346 inserted into the holes on the pulley (Fig 1).

NOTE: Replacement water pump  P/N #53021018 has been superseded to P/N # 53021018AB which will have the pressed on shaft.  Pump P/N # 53021018 was used to service 1993-1998 V6 and V8 engine water pumps.

Notes: Information only


Thanks to Bob Bergevin for providing this TSB information

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This page was edited on: May 3, 2004