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E36/7 Z3 (1996-2002)
E36/7 Z3 Roadster, Z3 coupe, Z3 M Roadster and Z3 M Coupe talk with our gurus here.

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  #51  
Old 10-11-2012, 01:18 PM
CTHuskyinMA CTHuskyinMA is offline
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Mein Auto: 2007 X5 4.8i, 1998 Z3
Quote:
Originally Posted by dougmcintyre View Post
Yes, the need is as real. The M44's aluminum block has a very small tolerance to being overheated. Consider the cost as insurance.

Unfortunately the Stewart pump isn't available for the M44. I would go with a stock BMW waterpump.
Thanks, that's what I will do. I'm guessing the stock pump has a plastic impeller and everyone seems to prefer metal, so I was hoping there was an alternative.
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  #52  
Old 10-11-2012, 01:49 PM
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morrieschoice morrieschoice is offline
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Mein Auto: 2001 3.0 Z-3 ROADSTER
Water pump

My 2001 3.0 liter came from factory with a water pump that had a metal impeller. I replaced it with a Bosch pump not realizing it had a plastic impeller (duhh). I had to replace it after 1 week...(see photo) I replaced it with a Stewart pump. . There are other pumps on the market that have a metal impeller. Just make sure it is metal.
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Last edited by morrieschoice; 10-11-2012 at 01:58 PM.
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  #53  
Old 10-11-2012, 03:15 PM
dougmcintyre dougmcintyre is offline
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Location: Chapel Hill, NC
 
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Mein Auto: 2000 M Coupe, 1997 318ti
Quote:
Originally Posted by CTHuskyinMA View Post
Thanks, that's what I will do. I'm guessing the stock pump has a plastic impeller and everyone seems to prefer metal, so I was hoping there was an alternative.
The metal impeller water pump was BMW's improved water pump. Now instead of the impeller failing, the water pump's bearing fails. Still should be replaced every 60k.
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  #54  
Old 10-12-2012, 07:20 AM
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Pinecone Pinecone is offline
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AFAIK, BMW started with a plastic impeller. It had one failure mode. They replaced it with one with a metal impeller. A different failure mode. And then a third one with a different plastic impeller.

Personally, I would put in the Stewart one and not look back.
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  #55  
Old 10-15-2012, 10:26 PM
tohbi tohbi is offline
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so many water pump stories may have something to do with how the car is driven. if you drive at a usual 3k rpm, you may not experience the failures the fellows do who redline their engines often.

moreover, what is the issue, disintegrating fan blades or bad waterpump bearings? checking for cracks in the fan blades may be a bigger factor than worrying about the waterpump.

just saying....
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  #56  
Old 10-16-2012, 07:06 AM
dougmcintyre dougmcintyre is offline
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Mein Auto: 2000 M Coupe, 1997 318ti
For me it's about insurance - cost of total cooling system overhaul low, cost of catastrophically overheating the engine high - well, relatively speaking. I prefer a new part to taking chances with "may not experience".

And it not just about waterpumps. All those plastic parts are known to get brittle and crack.
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  #57  
Old 10-16-2012, 07:47 AM
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amancuso amancuso is offline
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Mein Auto: 128i, 330i, Z3 2.3, R56
Mine started wobbling around 71K miles. 2000 Z3 2.3 replaced before catastrophic failure.
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  #58  
Old 10-17-2012, 05:14 AM
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Pinecone Pinecone is offline
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The water pump bearing get loose, and that lets the fam move enough to contact the fan shroud, which causes the fan to disintegrate.

It starts with the water pump bearings. And it has happened to people who do not drive their car hard.
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  #59  
Old 10-17-2012, 09:13 AM
tohbi tohbi is offline
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Quote:
Originally Posted by Pinecone View Post
The water pump bearing get loose, and that lets the fam move enough to contact the fan shroud, which causes the fan to disintegrate.

It starts with the water pump bearings. And it has happened to people who do not drive their car hard.
so the focus should be on the bearings. thx, pinecone.

in da old days, we used to buy something called waterpump lubricant. supposed to keep the bearings and seals healthy.
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  #60  
Old 10-17-2012, 06:55 PM
ronpolley ronpolley is offline
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Location: New Bern,NC,USA
 
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Mein Auto: 2001 Z3 3.0i Auto
2nd water pump

What a good day,talking to my wife with the Z3 running in the drive way,it started knocking,loudly.The fan was hitting the shroud.Yep,120,000mi and second water pump.No visible damages.It could have been a very bad day.
The last owner had replaced the fan,radiator,pump and hoses.The fan delete option looks good.
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  #61  
Old 10-19-2012, 06:56 AM
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Pinecone Pinecone is offline
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I think most coolants these days cover that. But you can try it.
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  #62  
Old 10-19-2012, 08:28 AM
wifesauto wifesauto is offline
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most water pump bearings i have seen are sealed. please dont tell me bmw lubes theirs with water...........like an old model A. my wifes has over 50k on her 05 2.5 so i guess i should start shaking the fan now and then. i am a retired mechanic and i really DO NOT WANNA DO ANOTHER WATER PUMP JOB EVER.i would rather buy the wife a new car

Last edited by wifesauto; 10-19-2012 at 08:31 AM.
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  #63  
Old 10-19-2012, 02:10 PM
ronpolley ronpolley is offline
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Location: New Bern,NC,USA
 
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Mein Auto: 2001 Z3 3.0i Auto
waterpump

Wifesauto,
You will have to take the pressure off the pump belt to check it,mine was knocking and moving about a half inch with it running but couldnt tell it by just grabing the fan and trying to check it that way. I also was a mechanic for 25yrs but this looks like a very easy change.15min to get the fan off,now I can easily get to the pump. By the way I have never heard a pump make such a noise.
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  #64  
Old 09-27-2013, 10:23 PM
wordsmyth wordsmyth is offline
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Mein Auto: 1998 BMW Z3 Roadster
I'm convinced -- 1998 Z3 with 89,700 miles on it. Change the frazzling water pump and rest easy.

As a point of information, I've seen links to cooling system kits and then I've seen posts where individuals refer to the parts they picked and chose when they did the work.

Does anyone have a complete parts list for this chore?

Thanks in advance.
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  #65  
Old 09-28-2013, 12:46 AM
comsult comsult is offline
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Mein Auto: 2001 Z3
Here's what I installed
Stewart Pump
Thermostat
Both Belts
Both Tensioners
Changed all Plastic Pullies to Metal.
All Hoses.
At the same time I drained the Power Steering resevoir, replaced it with a new one, The filter is in the resevoir, and filled it with fresh ATF. (ATF, Not Power Steering Fluid)
Fan Assembly

I had to change the shroud, and the Rad, as my pump bearing let go and the fan plowed into the rad and destroyed the shroud, No Hood Damage though.

Check prices and buy from different distributors. The only One thing I would insist on is the Stewart Pump.
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  #66  
Old 09-28-2013, 07:51 AM
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Randy Forbes Randy Forbes is offline
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Mein Auto: ///Motorized Vehicles
Here's a list with part number for use on the 1998 - 2000 ///M Coupe & Rdstr models (S-52 engine):

S-52 cooling system upgrade/maintenance components

March 24, 2013

Stewart waterpump
Waterpump gskt (O-ring) 11 51 1 711 484
Behr S-54 radiator
Upper radiator hose 11 53 1 708 499
Lower radiator hose 11 53 1 436 988
Reservoir hose (large to pipe) 11 53 1 740 649
Reservoir hose (small to tank) 17 11 1 723 521
Throttle body hose in 13 54 1 703 945
Throttle body hose out 13 54 1 703 865
Cylinder head to valve 64 21 8 401 809
Valve to core 64 21 8 362 777 (verified)
Core to cylinder head 64 21 8 401 808
Thermostat 88*C 11 53 7 511 580
Thermostat O-ring (gskt) 11 53 1 265 084
Thermostat housing (alum) (sourced through BMP)
Thermostat hsng gskt (profile) 11 53 1 740 437
Radiator upper mount grommet 17 11 1 712 911 (2 rqd)


DO NOT ORDER THE FOLLOWING HEATER HOSES W/QUICK-CONNECT FITTINGS:
11 63 7 830 994
64 21 8 376 608
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1999///M Coupe Estoril Blue Eurosport Twinscrew S/C
2001///M Rdstr Steel Gray
2011 X5 35i Sport Deep Sea Blue/Cinnamon
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  #67  
Old 09-28-2013, 09:07 AM
wordsmyth wordsmyth is offline
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Thanks to both for the responses. I'll start gathering my stuff and clearing a spot in the carport for the day of reckoning on this.

I'm also looking at an alignment issue that I noticed this week. Don't know yet if it can deal with any of it myself or if it will require a trip to the shop, but I do suppose my winter Saturdays are filling up already! (imagine sounds of wife cheering in the background) LOL.

Thanks again, and best regards --
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  #68  
Old 10-04-2013, 11:50 AM
laypoof laypoof is offline
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My 2000 bmw Z3 2.3 has 150k miles on it and nothing has been replaced and never had a problem, but after reading this forum im guessing that i should can anyone tell me parts that are not expensive yet still retain quality. im guessing i should change the water pump and thermostat. any links that are cheap but good. Im not trying to spend to much here
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  #69  
Old 10-04-2013, 02:13 PM
tohbi tohbi is offline
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with that many miles you probably want to follow randy's advice. the rubber parts are surely deteriorating.
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  #70  
Old 11-03-2013, 07:39 PM
wordsmyth wordsmyth is offline
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Mein Auto: 1998 BMW Z3 Roadster
So work, family needs, and all other things being equal it turned out that I took it to the shop. Replaced was the water pump (w/Graf metal impeller), thermostat and housing (w/a metal one), reservoir, hoses, belts, and pulleys.

The technician was able to tell that the system had been PM'ed at some point in the past, so my expenditure takes on more of a peace of mind posture than that of needed and overdue maintenance.

Either way I'm good to go. And thanks again for the list and other suggestions found in this discussion.
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