Yep, a large nut at the center that secures the unified fan / clutch assembly to the fan side of the flange that is secured to the water pump flange hidden under the water pump pulley bell.

In that instance you would use a chain or strap or other type water pump wrench around the water pump pulley bell. (As you would if doing this in your 1988 and the four 10mm hex hardware to separate the fan and clutch from the 1988 240 wasserpumpen, though much less force required of course on them four small sets of securing hardware.)



There exist a host of chain wrenches and other tools members here on this forum use. I mention a chain wrench as it works for me as counter hold. Other members will offer better suggestions, I hope.

I also had this same water pump fan on two 1979 240s (242 GT and 245 DL mustard or autumn colored yellow wagon).

You remove the two securing self-tapping metal screws that secure the water pump fan shroud to the radiator. You have to choreograph the left arm handling the (clockwise) counter hold on the water pump pulley bell and the other right arm to remove the center nut using a hex socket and ratchet or wrench (hex end). I found the center nut to be under some torque. A steady hand on the counter hold as you use a steady hand to remove the center nut.

One the nut is loose, you hold the weight of the fan / clutch assembly and unscrew the center nut.

With fan removed, you can remove the fan shroud.

It is a paradox as you can't remove the fan shroud without the water pump fan removed. You can't remove the water pump fan without removing the two top fan shroud screws and working around a loose fan shroud without marring the engine side of the radiator.

As Dave Volvo From Heck mentions, for more clearance, and avoid damaging the radiator, to drain the coolant and remove the radiator after freed shroud yet before removing the single fan / clutch assembly.

You repeat the exercise for four sets of 10mm.

You can upload any size image to BrickPix gallery so long as the image is under 1,024 kilobytes in file length, or 1 megabyte. Jarrod has not revised the BrickPix instructions yet. Tho your image is fine!


The 700-900 FAQ instructions for water pump change, the link is in a prior post in your thread mention inspection and test for resistance when pushing the fan blades when cold and with a hot radiator of the water pump fan viscous clutch. A nearly 40 year clutch may be worth of inspection or replacement.

You can install the same fan assembly as you have on your 1988 (or up to 1995 940) if you have a spare. Though inspect the junkyard pull or used for oil leaks or lack of resistance (fan spinning freely cold yet more so warm means failed).

When driving during warmer weather, as the engine heats to normal temp, you should hear the water pump fan roar under the hood. Though you won't usually here in in cold weather.
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