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Re: broken fan blades = new waterpump???? (archive)
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Posted by Vytas on October 13, 2000 at 08:55:59:

In Reply to: broken fan blades = new waterpump???? posted by Leo / 750iL on October 12, 2000 at 21:29:18:

Leo,
I had similar situation with my 91 750iL last year. I have concluded that water pump bearing wear was the cause of fan blade failure. Replacing pump is about 3h job, no special tools required. Just follow Bentley procedure. While there lube idler bearings and AC clutch bearing, replace belts. One small tip: spray WD40 on o-rings of water pipes upon installation of the pump. BTW, I got my pump from iautoparts.com for $140, fan blade from eurasian for $30. Phosphate free radiator fluid is recommended. My $0.02.
Vytas
Last week I suddenly got a strong vibration from my engine. After a quick check of the engine compartment, I took a very aggressive test ride. (dumb move) When I heard the loud bang and saw a pc fly out from under car I stopped and checked again. It turned out to be broken fan blades causing the vibration from being out of balance.( 5 of 11 blades now broken )I drove home removed fan and ordered a new one.
Well today I recieved the new fan and quickly installed. I checked to make sure nothing was hitting fan and ASSumed the old fan broke from old age.
Took a ride -BANG/BOOM! fan breaks again. Now I have about 5 mls to home. It appears the fan shroud was coming loose from its lower clip at high speeds and hitting fan. Luckily the radiator has survived all this with only minor scars.
An additional problem I see now is that the bearing on the H2O pump is very loose and wobbly. I guess that's the result of driving with the unbalanced fans.

SO, now I need another new fan blade, a new fan shroud, and a new waterpump. I guess I'll change the thermostat and anti freeze too. I just read a post regarding the updating of the cooling system. Please advise me of what needs to be updated at time of pump change.
Any recommendations on where to get these parts?
Is the waterpump a reasonably easy job?
Any special tools required?
Anything else that should be done while I'm in there?
Does the bimmer require any special anti-freeze?
TIA
Leo '91 750iL




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