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Old 04-01-2002, 02:36 PM
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Join Date: Apr 2002
Location: MA
Posts: 5
Question Fan Clutch 1986 300E

I have a 1986 300E which is shaving off aluminum pieces from the fan clutch. I believe I need to replace the clutch. Can the clutch be removed without special tools? Is it a difficult repair without a proper tool and can the average sidewalk mechanic replace it? Also I looked up the part and it calls for replacing the fan based upon engine #. Does anyone know why the fan needs to be replaced?

Please respond with any advice, it would be greatly appreciated.


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Old 04-01-2002, 10:05 PM
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Join Date: Apr 2001
Location: Joliet Illinois
Posts: 309
Fan Clutch Removal

The fan clutch removal is not too difficult and has to be done for some routine maintenace items such as replacing the serpentine belt.

The bolt that holds it onto the pulley takes an 8mm allen wrench (with breaker bar extension) and quite a bit of force to get it loose.

To get access to the bolt you need to unclip the fan shroud and lift it up partially. It will not come completely off until the clutch has been removed.

You will also find that the pulley will just turn when you try to loosen the nut. You can make a tool to hold the pulley by taking a piece of 3/16" steel rod about 12" long and bending the end 90 degrees in a vise. The bent end needs to be 1/2" long. The 1/2" end of the tool rests in a slot in the pulley mouting casting and will engage in a hole in the back of the pulley as it is rotated, locking it so it cant turn. The tool is also needed when reinstalling the fan clutch.

Hope this information helps.
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Old 04-02-2002, 11:35 AM
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Join Date: Mar 2002
Posts: 47
I jsut did some of this for a different purpose. I had removed the radiator which made this somewhat easier. I then removed the fan shroud. I assume that if the radiator is not first removed, then the fan shroud is loosened and shoved toward the engine block. Then unbolt the fan blades. In my car, the bolts were not difficult to remove; I simply gently held the fan blades to prevent the whole assembly from spinning and turned out the bolts with a socket set. I then removed the serpentine belt. Since I was going to replace the belt anyway, I cut a chunk of the old belt to the circumferance of the fan pulley, wrapped this junk of belt around that pulley, and used a piece of electrician's tape to hold the belt ends together. I then used a vise grip like tool which uses a chain to wrap around the circular object you wich to control, and ran the chain of this tool around the fan pulley and clamped the tool lightly shut. The old piece of belt protected the pulley from the chain of the clamping tool and gave a rubber gripping action which increased the overall friction and effectiveness of the clamping tool. This was more than enough to hold the pulley in place while I used a rachet with an 8mm allen socket to loosen the bolt which holds the aluminum piece to the steel pulley. You don't need to remove the clip on front of the aluminum piece. Just pull the 8mm bolt and the aluminum piece slides off. I thought the process was pretty easy.

That said, I feel kind of dumb about not even knowing about that trick regarding using the piece of rod to lock the pulley in place. It's good to learn things!
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