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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > BMS Thermostat Installed -- now i have a leak! Pictures post #9



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      10-19-2013, 08:35 AM   #1
MSport_Jon
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BMS Thermostat Installed -- now i have a leak! Pictures post #9

Hello everyone,


recently i got a new tapered BMS oil cooler thermostat installed and now my car is leaking oil from somewhere... i am suspecting that is the housing... can anyone confirm that perhaps the BMS thermostat has pronounced a leak problem more or perhaps is obstructing a section and building up pressure somewhere?


there is some oil splattered on the hood insulation right around where the area meets the housing area...


Should i remove the BMS Thermostat?

Last edited by MSport_Jon; 10-21-2013 at 08:17 AM. Reason: pictures
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      10-19-2013, 08:56 AM   #2
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I would remove and inspect the gasket and ensure everything is tightened down to spec first.
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      10-19-2013, 09:02 AM   #3
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Quote:
Originally Posted by Jeff@TopGearSolutions View Post
I would remove and inspect the gasket and ensure everything is tightened down to spec first.
+1 Sounds like installation issue.
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      10-19-2013, 09:25 AM   #4
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Be diligent about re-tightening the bolts you remove to access the thermostat. I didn't torque down the backing plate enough the first go around, and my laziness was rewarded with about a quart of oil gushing out of the housing when i turned the car on. Not fun. Def user error it sounds like.
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      10-19-2013, 10:12 AM   #5
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Quote:
Originally Posted by MSport_Jon View Post
Hello everyone,
recently i got a new tapered BMS oil cooler thermostat installed and now my car is leaking oil from somewhere... i am suspecting that is the housing... can anyone confirm that perhaps the BMS thermostat has pronounced a leak problem more or perhaps is obstructing a section and building up pressure somewhere? there is some oil splattered on the hood insulation right around where the area meets the housing area... Should i remove the BMS Thermostat?
Did you use a quality torque wrench to secure the bolts?
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      10-19-2013, 11:24 AM   #6
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I have similar version made by Stertman in Sweden. The "non termostst" was a fraction of a mm too long and made a seal near impossible. I sanded down the back edge a little and now installs easily but snug. Been using it for two seasons now.
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      10-19-2013, 03:46 PM   #7
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Yeah... It sounds like it is the thermostat no fitting in correctly... I see some oil seeping through the gasket joint on the housing itself on the upper part where it meets the oil refill lid. The is nothing on the lid. I can't imagine how it is underneath
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      10-19-2013, 06:50 PM   #8
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The BMW thermostat can't cause a leak, only the installation being done wrong - you can put nothing in there and it won't leak as long as you put it back together right. There is quite a bit of pressure in there, so make sure you have it all tight and that the seal is still properly in the grove and didn't get pinched.

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      10-21-2013, 03:50 AM   #9
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Quote:
Originally Posted by roadkillrob View Post
The BMW thermostat can't cause a leak, only the installation being done wrong - you can put nothing in there and it won't leak as long as you put it back together right. There is quite a bit of pressure in there, so make sure you have it all tight and that the seal is still properly in the grove and didn't get pinched.

Rob
i think it could... I think that the original BMW thermostat was designed to move freely via spring tension between the oil cooler and straight through passages. Thus pressures are not always 100 % against one passage vs. the other. once you install the BMS Oil Thermostat you will no longer use one of the passages and use the other one from that point on and unlike the OEM thermostat that has indentations around the thermostat to allow for some flow, the BMS Thermostat does not and almost completely seals straight through passage hence forcing oil through the oil cooler with almost 100 percent pressure... im not saying the BMS is a bad product. it does what it says, but in my case i think if i wouldn't had added the BMS thermostat i would not had experienced the leak... and adding crappy worn off seals then the problem can be created and triggered by the thermostat.





i took pictures and it looks like it is leaking from the fitting coming out towards the oil cooler element.






Last edited by MSport_Jon; 10-21-2013 at 04:46 AM.
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      10-21-2013, 11:19 AM   #10
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Any products recomended to clean this mess up..? i heard of Chemical Guys Grime Remover....
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      10-21-2013, 11:37 AM   #11
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I would wash off at least the front of engine to remove all the grime and oil before it gets to the belt.
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      10-22-2013, 05:05 AM   #12
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Quote:
Originally Posted by GoRomeo View Post
I would wash off at least the front of engine to remove all the grime and oil before it gets to the belt.

Good advise..! i bought chemical guys grime reaper solution to wash the engine later one when it gets here... this stuff is supposed to be really good and nearly touch-less
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      10-22-2013, 08:29 AM   #13
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ok just an update on the status of the car. technician replace 2 o rings pertaining to return lies underneath the thermostat housing and the gasket that joins the thermostat with the oil filter housing... now its monitoring galore...


the joint seal between the thermostat housing and the oil filter housing seems to be wet at the moment. i hope this holds...

Mechanic did a good job cleaning the engine...
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