water pump

UK forum for general and technical discussion about the Z3 roadster

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k9paul
Joined: Sat 30 May, 2015 08:18
Posts: 29

  Z3 coupe 3.0i

water pump

Post by k9paul » Fri 17 Jul, 2015 14:09

is it a diy job to change the water pump on z3 am not bad with a spanner
thx paul

Simon59
Joined: Thu 06 Nov, 2014 13:17
Posts: 28

  Z3 roadster 1.9
Location: Wilmslow

Re: water pump

Post by Simon59 » Fri 17 Jul, 2015 15:39

Hi Paul

I changed mine a few months ago (1998 1.9 engine) and it took less than an hour, no problems or special tools required. I had replaced my thermostat (which did give problems) and decided to change the water pump while I was at it. I had read that the ears of the pump which you use to jack it out can break off, but mine came out easily.

Good luck, Simon

k9paul
Joined: Sat 30 May, 2015 08:18
Posts: 29

  Z3 coupe 3.0i

Re: water pump

Post by k9paul » Fri 17 Jul, 2015 16:12

many thx mate

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Tufarlian
Joined: Sat 14 Mar, 2009 20:21
Posts: 267

  Z3 roadster 3.0i
Location: Cheshire
Contact:

Re: water pump

Post by Tufarlian » Sat 18 Jul, 2015 08:28

I changed my water pump (Z3 3.0i). Not a difficult job really.

Didn't need to remove the radiator but you do need to remove the viscous fan and shield. Can be done with just the large spanner but quicker if you have the special holding tool as well.

Water pump itself is easy enough when the fan and belts are off. 4 bolts.

Search Youtube for videos that show you how.....

Cheers
Mark

k9paul
Joined: Sat 30 May, 2015 08:18
Posts: 29

  Z3 coupe 3.0i

Re: water pump

Post by k9paul » Sun 19 Jul, 2015 08:29

cheers mark

Hairyscreech
Joined: Thu 16 Apr, 2015 13:08
Posts: 69

  Z3 roadster 2.8

Re: water pump

Post by Hairyscreech » Tue 21 Jul, 2015 17:14

Having just done mine on an early 2.8 you may have to remove the rad depending on what engine you have, I found I could not quite get the fan off the nut without removing the rad.

Dino D
Joined: Fri 10 Feb, 2012 16:59
Posts: 376

  Z3 roadster 2.8

Re: water pump

Post by Dino D » Tue 21 Jul, 2015 18:10

In my experience I'd say whilst you in there change the thermostat housing (plastic on 2.8 and cracks) and thermostat.
Check viscous fan and the actual plastic fan itself. They can break with no warning as they get old and bits fly off damaging things you don't want damaged, happened on mine.

peter2b
Joined: Sat 01 Nov, 2014 18:47
Posts: 933

  Z3 roadster 2.2i
Location: cheshire

Re: water pump

Post by peter2b » Tue 21 Jul, 2015 21:07

If it's a 4 pot you should have loads of room, when I did my 6 pot I had to take off the fan shroud ,fan (4 bolts) then the water punp you will then have to take off the fan mounting to put onto your new pump ,took me about an hour
peter2b

Hairyscreech
Joined: Thu 16 Apr, 2015 13:08
Posts: 69

  Z3 roadster 2.8

Re: water pump

Post by Hairyscreech » Thu 23 Jul, 2015 12:29

A little worthwhile note here:

The viscous unit for the fans should always be stored upright in the same way it sits on the car, if you leave them flat they can fail. I am not sure of the failure mechanism but it is something that is know on the e30 stuff with the same fan type.

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BladeRunner919
Joined: Fri 17 Feb, 2012 20:18
Posts: 2220

  Z3 roadster 1.9

Re: water pump

Post by BladeRunner919 » Thu 23 Jul, 2015 12:45

Hairyscreech wrote:A little worthwhile note here:

The viscous unit for the fans should always be stored upright in the same way it sits on the car, if you leave them flat they can fail. I am not sure of the failure mechanism but it is something that is know on the e30 stuff with the same fan type.
I've heard that a lot, but I wonder if there's any actual evidence to support it. Let's face it, how we know that the viscous has been upright from the point of manufacture to the point of fitment? If you buy a new one, does the retailer store them vertically? If a courier delivers it, etc, etc...

I can't help thinking there's a lot of urban myth about this.

Cooper01
Joined: Tue 29 Apr, 2014 09:06
Posts: 152

  Z3 roadster 3.0i

Re: water pump

Post by Cooper01 » Thu 23 Jul, 2015 12:51

Someone above mentioned that he had issues removing the fan and took out the rad.

Not required to remove rad. Once you loosen the fan off unclip the fan shroud and move them both up and out together. Easy!

Cheers, Cooper

Hairyscreech
Joined: Thu 16 Apr, 2015 13:08
Posts: 69

  Z3 roadster 2.8

Re: water pump

Post by Hairyscreech » Thu 23 Jul, 2015 15:44

Cooper01 wrote:Someone above mentioned that he had issues removing the fan and took out the rad.

Not required to remove rad. Once you loosen the fan off unclip the fan shroud and move them both up and out together. Easy!

Cheers, Cooper
When I was doing mine the other day I needed a good 3 more turns on the nut than the space in between the engine and rad would allow, no way I was going to try with the Z3 6 cylinder rad being unique.

It was a good chance to inspect, clean and flush the radiator while I was in there really and removing the Rad is simple, It only took me 1hour 30 even with removing and cleaning the Rad.

As someone above mentioned, if you remove the viscous from the fan then there should be no problem.

The water pump I took out was a genuine BMW one with a silver soldered together stainless steel sheet metal impeller. If there are multiple pump impeller types there may be a variation in the length of the end nut too?

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