How Do I Remove a Fan Clutch from a 5.9 Cummins?by Russell Wood
The 5.9-liter Cummins engine found in most Dodge diesel pickups uses a fan clutch mounted on the water pump to cool down the engine. This clutch reacts to the heat in the engine bay and either speeds up or slows down accordingly. If the fan clutch goes out, then the fan won't cool down the engine and radiator efficiently. To deal with the problem, the first thing you have to do is take out the fan clutch.
Pop the hood. Unclip the throttle cable connected to the fan shroud with your hands, then unbolt the overflow container from the fan shroud using the 3/8-inch ratchet and socket.
Insert a pry bar into the bolts on the face of the water pump pulley so that the pry bar keeps the water pump pulley from turning. Remove the bolt on the fan clutch using the 36 mm open-end wrench, turning the wrench clockwise to loosen the bolt.
Unbolt the fan shroud from the core support with the 3/8-inch ratchet and socket. Take the fan shroud and the fan clutch out of the engine bay. Unbolt the fan clutch from the fan with a 3/8-inch ratchet and socket.