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E36 M3 (1992-1999) {Euro - S50 B32 321hp @ 7400 rpm} {U.S. - S52 B32 240 hp @ 6000 rpm}
Total Produced: 71,212 - Years Produced: 1992 to 1999


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Old Fri, Aug-18-2017, 05:34:43 PM   #41
Anubis
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Default Re: Aluminum vs Plastic Thermostat Housing

Yeah, the aluminum ones were all the rage about 10 years ago. PO of my car put one on, and it was a terrible decision. Went back to the OE composite -- no problems since.
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Old Fri, Aug-18-2017, 09:24:41 PM   #42
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Default Re: Aluminum vs Plastic Thermostat Housing

Quote:
Originally Posted by Anubis View Post
Yeah, the aluminum ones were all the rage about 10 years ago. PO of my car put one on, and it was a terrible decision. Went back to the OE composite -- no problems since.
Same here.

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Old Sat, Aug-19-2017, 02:01:11 AM   #43
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Default Re: Aluminum vs Plastic Thermostat Housing

Maybe they used to be made like crap before but not anymore?

I put one on my car car a year ago and had one on my last E36 and never had a problem with it. Maybe I just got lucky.
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Old Sat, Aug-19-2017, 02:05:36 AM   #44
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Default Re: Aluminum vs Plastic Thermostat Housing

Same, I'm running aluminum Uro housings on both of my cars and have never dad a leak.


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Old Sat, Aug-19-2017, 02:17:07 AM   #45
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Default Re: Aluminum vs Plastic Thermostat Housing

I put a Uro aluminum one on my car 2 years ago, fought with it for a week and a half and gave up and went to an OEM plastic one. Hasn't leaked since. Not saying they're all bad, but theres clearly some variation in the manufacturing process and the quality control must be pretty poor, whereas the OEM pieces will be much more consistent. Sure, a good aluminum one might be better than the OEM piece if you're lucky enough to get one, but its just not worth the hassle in my opinion.
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Old Tue, Aug-22-2017, 01:22:20 PM   #46
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Default Re: Aluminum vs Plastic Thermostat Housing

I've been running an aluminum one for a bit. When I first put it on, it sprung a bit of a leak after a couple thousand miles. i took it off, I think I put a new gasket again or used the same one, but this time put some RTV as well. hasn't leaked since, been a couple of years.

I think I got mine for free from Zionsville with the purchase of a Stewart pump, I forget which brand it is.
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Old Tue, Aug-22-2017, 02:18:35 PM   #47
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Default Re: Aluminum vs Plastic Thermostat Housing

I switched back to plastic too after mine leaked.
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Old Tue, Aug-22-2017, 02:46:48 PM   #48
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Default Re: Aluminum vs Plastic Thermostat Housing

It's been no longer pure plastic for many years. I replaced mine in 2009 after my waterpump bearing failed.

The OEM one I ordered was clearly of a different material than the one that came off and has this metal dot in the center on the stat side that marks this version. The old one didn't have such a dot.

Same thing for the impeller on the pump. One that came out was metal, new one same composite material as the housing.

That was back in 2009. Car's still doing fine.

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Old Wed, Aug-23-2017, 07:50:31 PM   #49
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Default Re: Aluminum vs Plastic Thermostat Housing

I don't remember the brand, but I've had my stewart water pump/aluminum housing installed for over 10+ years with no leaks....

I will never again put anything on my M3 labeled "URO"....I wonder who made the aluminum housing back in the day...never heard of them being a problem
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Discussing Aluminum vs Plastic Thermostat Housing in the E36 M3 (1992-1999) Forum - {Euro - S50 B32 321hp @ 7400 rpm} {U.S. - S52 B32 240 hp @ 6000 rpm}
Total Produced: 71,212 - Years Produced: 1992 to 1999 at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)