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Elisa Morales
03-14-2004, 08:26 PM
Help! I'm trying to replace my water pump. Can anyone assist in how to: 1) remove the fan (everything turns together)OR 2) get to the last remaining bolt in the water pump without removing the fan. It seems like an offset wrench would work but there is no room between the bolthead and the "housing" it is next to.

Why do I try to do these things myself?
Any help would be appreciated.

03-14-2004, 09:17 PM
You need to remove the fan first, then tackle the water pump. If it's the common single 13mm head bolt in the front the fan that goes all the way into the nose piece of the water pump, use a deep off-set 13mm wrench and hold the fan to keep the water pump from turning while you work the bolt loose. The nose piece is bolted through the water pump pulley with 4 bolts, usually small allen bolts.
Once you get the fan off, you can unscrew the pulley/nose extension from the pump, and then the actual water pump bolts.

If however, you've got the large nut style water pump and fan clutch, then you need to use a 32mm thin wrench, and loosen the fan clutch/nut !clockwise! since the threads are left-handed. You can hold the water pump pulley with either a made-up version of the factory tool that is a simple bar with two holes in it, the same spacing as two of the water pump pulley bolts, or simply use a pair of very large pliers to grab the outside of the water pump pulley and hold it still that way while you loosen the fan clutch/nut.
Hope this clear things up.

Elisa Morales
03-14-2004, 10:47 PM
Thanks. Got your reply just as we were figuring it out. Your clear explanation really helped us to know we were on the right track. Now to back out the three remaining allen bolts. They are stripped out. I think we'll need an easy out. Oh Well!

J Stein, 85 745, celebrating 10 fun years
03-15-2004, 11:45 AM
water pump.

It uses a 32 mm wrench. You need a thin one to reach in, NAPA has one for about $30,


go to a bicycle shop and get one (usually much less expensive..) then

set the wrench on the nut and with a hammer, give the wrench a sharp wack


The nut should break loose easily and the fan spin off freely... Regards

John Stein

<img src="" height=61 width=97>

J Stein, 85 745, celebrating 10 fun years
03-15-2004, 11:46 AM
It has LOTS of answers ........... jsRegards

John Stein

<img src="" height=61 width=97>

03-15-2004, 02:30 PM
Kevin Elmore
'86 735i
223,500 miles
Virginia Tech
<img src="http://www.***********.com/members/vtbimmer/Rear.JPG">

03-15-2004, 06:27 PM

Roy in GA
03-16-2004, 01:09 AM

03-16-2004, 08:47 PM
Usually you can carefully hammer at those tiny allen screws with a sharp,small chisel at an angle, and get them to start turning in the direction you want, which is unscrewing them hopefully. Take your time, protect the radiator and replace the nose piece on the water pump if you damage it while doing this or if it's worn where the fan clutch rides on it[too loose of a fit isn't a good thing here, think of it like a bearing or stub axle that supports the inner race of the fan clutch bearing. ] Get 4 new allen bolts while you're at it.

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