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DIY: Do It Yourself
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Old 03-18-2015, 02:10 PM   #1
Kearnster
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Stewart High Preformance water pump

What is everyone's opinion of their water pump, its sold on bavauto for about 195$ does anyone have any experience with it and is it worth it over the stock BMW pump?
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Old 03-18-2015, 02:58 PM   #2
SilberVogel
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You'll find a lot of strong opinions on the Stewart water pump (as well as on metal vs. composite impeller), almost as much as on what oil to use. Suggest you search the forums, as there has been much discussion on the topic.

Personally, I'd recommend going with Saleri (OEM) which can be had for as little as $50. In order to see any return on investment with the Stewart pump, you'd have to replace the Saleri (OEM) pump at least four times.

Regarding metal vs. composite impeller, there are some legitimate concerns (and real life examples) where serious failure can cause the metal impeller to do more damage to the aluminum housing than the composite one. Feel free to draw your own conclusions from all the discussions out there, but here are a few to get you started:

Stewart vs. OEM Saleri: https://forum.e46fanatics.com/showthread.php?t=1019621
Metal vs. Composite Impeller: https://forum.e46fanatics.com/showthread.php?t=922091

Just my 2.
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DIYs help you save money with repairs; let
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help you save money with the parts.
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Old 03-18-2015, 07:09 PM   #3
Sansho
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BMPDesign.com has the Stewart water pump for $180. I've had it installed for 5 years with no issues.
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Old 03-23-2015, 01:45 PM   #4
Kearnster
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Thanks Guys this is awesome stuff to hear!
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Old 03-24-2015, 03:17 PM   #5
Buggy101
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oembimmerparts has it for 175 free shipping.
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Old 03-27-2015, 06:57 AM   #6
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I had the stewart pump and it started leaking
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Old 03-27-2015, 09:05 PM   #7
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go with the OEM, composite; no benefit to the macho metal or the high-$ one with exciting name. We're talking reliability, not 'performance' , it displaces water in a circuit, for Christ's sake.
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Old 03-27-2015, 09:13 PM   #8
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I love mine and have had zero issues for 2 years... Others will tell you horror stories they have heard or tell you it is a waste of money. Truth be told... It really is.
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Old 03-27-2015, 10:55 PM   #9
m1356guy
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I bought a Meyle Water Pump for 1/4 of the price: http://www.bmaparts.com/item.wws?sku...E&weight=2.020

Driven 10 track days with it and it's held up like a champ...no issues. It's OE and made for our cars. I wouldn't waste your money on a Stewart
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Old 03-27-2015, 11:07 PM   #10
Sansho
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Quote:
... It's OE and made for our cars ....
I thought Saleri was OEM on the e46 water pump. Where do you get that Meyle was original equipment? (of course BMW could have multiple suppliers).
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Old 03-27-2015, 11:10 PM   #11
330atx
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I've had mine for 57,000 miles, no leaking and no problems. I recommend it. I'm at 176,000 miles.

Less parasitic drag is a +
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Old 03-28-2015, 09:26 AM   #12
m1356guy
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Quote:
Originally Posted by Sansho View Post
I thought Saleri was OEM on the e46 water pump. Where do you get that Meyle was original equipment? (of course BMW could have multiple suppliers).
So I didn't mean Meyle was the OEM, but just that the pump I bought is more "OE" than the Stewart pump. The only upgrade on the Meyle is the metal impeller, which I feel is a must if you're upgrading the pump.
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Last edited by m1356guy; 03-28-2015 at 09:34 AM.
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Old 03-28-2015, 10:30 AM   #13
aba4430
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We have had the Stewart on our 98 Z3 for ~35K miles (~24K of this during 2014) and the 2000 328Ci for ~3.5K miles (<2 months); no issues. There are examples where folks have had issues with the O-rings on Stewart pumps causing leaks due to compatibility, but I have not read anyone reporting mechanical failures specifically with the Stewart. When we contacted Stewart as part of our E46 purchase, they did indicate that our pump with a "S" scratched on it meant that it had an updated O-ring! About buying a Stewart being waste of money, not sure - you have to decide.
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Last edited by aba4430; 03-28-2015 at 10:31 AM. Reason: spelling correction
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