Sunday, October 4, 2009

How to remove a BMW fan clutch?

I have a 1992 BMW 525i and I have to remove the fan clutch. I don't have that wrench that you need and I was wondering if there is any way to remove it without the wrench.



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Go to a bike shop and get 32mm thin wrench. Should be about $10. Slide a thin, long screw driver under the hex nut to hold the fan clutch in place, and turn it using the 32mm thin wrench clockwise direction. YES, ALL BMW fan clutches are reverse threaded.



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Unfortunately, on a BMW especially, it is EXTREMELY difficult to remove the fan clutch without the correct wrench. If you have to replace the fan clutch, the clutch is bad; so there is no way to gain leverage to loosen the clutch from the pulley without the wrench.



Your best bet is to head over to your big chain auto parts store (Checkers, Auto Zone, Advance Auto Parts, etc.) and borrow the wrench. The big chains will lend the tool to you (usually for little or no charge) so you can get the fan clutch off.



Good luck!
Using the specially designed tool is the best option. However, in a pinch, you can do it using a fan belt.



After all belts are removed, place a fan belt around the fan pulley. Use a pair of vise grips to clamp the belt loop to itself, right next to the pulley. In other words, the belt should be wrapped 360 degrees around the pulley with the vise grips closing the loop tightly. Essentially, you are making a noose using the fan belt.



Now vise grip the free end of the belt to the engine block. When you turn the bolt, the belt will hold the pulley from spinning.



THIS BELT IS NOW DAMAGED AND MUST BE REPLACED!!! But you should be replacing the belts anyhow!!

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