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5 Series DIY
Knowledge Is Power! ~ The place for do-it-yourself threads on a variety of topics. Start a thread describing a particular job (oil change, cooling system overhaul, brakes, shocks and springs, etc.) or search for one you need help with!

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  #1  
Old 10-29-2007, 08:39 PM
cn90 cn90 is offline
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DIY - Fan Clutch Nut Installation

Just replaced my defective "MTC" Fan Blade.

Those of you who have replaced water pump or done the cooling overhaul know it is a PITA to install the Fan Clutch onto the WP Hub: the space is tight, the thin 32-mm wrench does not have much room to move etc and etc. Sometimes it can take up to 15 minutes to thread this stupid 32-mm Nut.

Well, I just came up with this trick that makes the Fan Clutch Nut Install in 10 seconds! It was a breeze!

- Remember that this NUT is reverse thread, so turn it Counter-Clockwise to tighten it.

- Get a short section of a poultry cord (dental floss or shoe lace is also OK)

- Use a small piece of masking tape to tape one end of the cord onto the NUT.

- Wrap the cord around the 32-mm Nut 3-4 times in such a way that when you pull the cord, the NUT turns CCW (Viewed from FRONT of car)....See Picture.

- Apply a bit of grease or antiseize on the 32-mm Nut to make install easy (also making future removal easy).

- Hold the Fan Clutch snugly against the WP Hub, then Pull the cord upward. This will turn the NUT CCW. No need to tighten the nut. Engine rotation will tighten it.

Install takes less than 10 seconds!

HTH.
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Last edited by cn90; 10-29-2007 at 08:56 PM.
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  #2  
Old 10-29-2007, 08:45 PM
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jvcajita jvcajita is offline
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ingenious! i'll do that next time. gonna put it on as a bookmark!
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  #3  
Old 10-29-2007, 08:46 PM
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I don't need this advice, but I like it.
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  #4  
Old 10-29-2007, 08:59 PM
cn90 cn90 is offline
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Quote:
Originally Posted by djfitter View Post
I don't need this advice, but I like it.
My advice is always free...hehe....
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  #5  
Old 10-29-2007, 09:56 PM
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slick... i would just put it on when the car is running..... NOT.
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  #6  
Old 10-30-2007, 12:15 AM
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yeah...

Quote:
Originally Posted by chivas View Post
slick... i would just put it on when the car is running..... NOT.
Heh he heh ehheheeh funny stuff!
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  #7  
Old 10-30-2007, 07:51 AM
cn90 cn90 is offline
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slick... i would just put it on when the car is running..... NOT.
Buy $1M life insurance before doing that chivas...hehehe...
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  #8  
Old 10-30-2007, 07:59 AM
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That's great! Don't pull too hard, you might start it.
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  #9  
Old 10-30-2007, 07:59 AM
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If your fan clutch is in proper working order, just spin the blades and the nut tightens 90%. The last 10% i use a 32mm wrench and a rubber mallet.
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  #10  
Old 10-30-2007, 08:15 AM
cn90 cn90 is offline
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Quote:
Originally Posted by bimmerd00d View Post
If your fan clutch is in proper working order, just spin the blades and the nut tightens 90%. The last 10% i use a 32mm wrench and a rubber mallet.
bimmerd00d, that is not the issue: the issue is how to start the first thread of the stupid NUT!!!! Once it starts to catch the 1st thread in, you spin until it stops. The engine rotation will tighten it.

Last edited by cn90; 10-30-2007 at 08:31 AM.
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  #11  
Old 10-30-2007, 08:26 AM
poolman poolman is offline
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Thanks Cn90--When I was opening the thread ,I started to wonder if it was possible to tie a piece of cord on and make it do the trick--will be useing this in the next couple of weeks.
I was just imagining how difficult putting the fan back on was going to be-no room and all
The fan will sit on the hub I understand and with the rope trick I can see this greatly aiding the rebuild.
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  #12  
Old 10-30-2007, 08:33 AM
cn90 cn90 is offline
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Yeah, some people spend up to 30 min to thread the 32-mm nut in, after some "nice" language like "wtf" it will go in. This is because the space is so tight, unless you have small child hands, it is very difficult to catch the 1st thread...Been there done that...

Last edited by cn90; 10-30-2007 at 08:42 AM.
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  #13  
Old 10-30-2007, 08:49 AM
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Very clever, but sense my both belts snapped last week and left me stranded on the side of the beach...the easiest way I found to put the fan back on was to hold the fan so that the nut was pushed up against the bolt and have my buddy give the car a real quick crank(not start the car) on the ignition.
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  #14  
Old 10-30-2007, 09:32 AM
drbeck drbeck is offline
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Another option is to go from the bottom and thread the nut on. The fan shroud has larger gap on the bottom that makes it quite easy to reach your hand up and start the threads.
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  #15  
Old 10-30-2007, 09:44 AM
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Or you could just give up and weld it on.
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  #16  
Old 10-30-2007, 09:56 AM
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  #17  
Old 10-30-2007, 10:40 AM
bmwm3coupe bmwm3coupe is offline
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Very clever!
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  #18  
Old 10-30-2007, 11:47 AM
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Quote:
Originally Posted by cn90 View Post
bimmerd00d, that is not the issue: the issue is how to start the first thread of the stupid NUT!!!! Once it starts to catch the 1st thread in, you spin until it stops. The engine rotation will tighten it.
OH, yeah that's a pain in the buttocks (forrest gump).
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  #19  
Old 10-31-2007, 03:20 PM
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e39dream e39dream is offline
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good tip- getting the thing started is the hard part, at least for me.
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  #20  
Old 09-19-2008, 09:40 AM
Eric528i Eric528i is offline
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Fan clutch

I am getting ready to replace mine this weekend on my 528i and can't thank you enough for the tip before I get started.
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  #21  
Old 01-19-2009, 07:13 AM
xWulfgar xWulfgar is offline
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Thumbs up

Good job.
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  #22  
Old 05-23-2009, 08:44 PM
Lbert Lbert is offline
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Great idea!
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  #23  
Old 07-30-2010, 02:10 PM
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Does anyone know the TAP size to clean the threads on the water pump shaft?

I didn't know about this wonderful trick until it was too late.

The last thread or two of my water pump shaft is "sharp" to the touch, such that the fan nut is going on crookedly (details here and here).
I'll bet this next question has never been asked on Bimmerfest before ... but I need to know ...

Q: Do you know what the tap size is for the water pump shaft threads?

BTW: Below is a pictorial DIY of cn90's suggested method. It failed for me, but, only because I had already stripped the last thread or two of the water pump shaft NOT using this method!








Last edited by bluebee; 07-30-2010 at 02:14 PM.
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  #24  
Old 09-04-2010, 03:15 PM
Vike3 Vike3 is offline
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That's awesome. I just did the full cooling overhaul and they say the first step
and the last step (dealing with that hex nut) are the hardest. They turned out
to be the easiet thanks to that trick. I used kite string and duct tape.
*
now I just gotta deal with air in the system. Everytime no matter what I try
I always get it.
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  #25  
Old 09-05-2010, 10:16 AM
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I was amazed I guess or maybe just lucky but I was able to just grip the fan on both side and spin it right on the nut to start it*...then I just spun the fan to tighten it as much as possible and threw the 1 1/4" wrench on it to tighten it a tad more. Just let the engine to the rest over time.

* - Okay, I tried doing it from above for a few mins...then below for a few mins...then I was going to try the string trick and decided to try it from above again and son of a gun, spun the sucker right on. Lucky me.
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