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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 > Orings leaking at oil cooler housing hoses, again



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      08-25-2016, 12:06 PM   #1
expressfish
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Orings leaking at oil cooler housing hoses, again

So I replaced my ofh gaskets and the two orings where the hoses attach. Its been about three thousand miles and I have a drip coming from the hoses. Ive been wiping it down daily to make sure that where its coming from. Any pointers here ? O rings were brand new....
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      08-25-2016, 01:43 PM   #2
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Oem orings?

My thoughts are damaged or twisted orings during install; possibly not lubed during install; or debris somehow got in there preventing a good seal.
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      08-25-2016, 06:15 PM   #3
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yeah, oem o rings. Will have to order a new pair and check it out. Just didnt know if this was a common issue.
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      09-21-2016, 11:14 AM   #4
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so I installed new orings and mating areas were clean of any debris as was before. Im still getting a leak from the right hand side hose in the pic. Makes no sense. Guess Im going to "black rtv" it. Anyone else have any ideas ?
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      09-21-2016, 11:36 AM   #5
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Check the thermostat. I just had this fixed. Looked like the OFHG, on cleaning found that the thermostat was corroded

Here is what was replaced on mine https://www.ecstuning.com/b-genuine-...5q7RoC5Djw_wcB
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      09-21-2016, 11:54 AM   #6
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You still didn't mention if you lubed them before installation.
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      09-21-2016, 01:10 PM   #7
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no lube before install. Clean and dried with a rag. Theres really no way for them to get damaged during the install. Oring slides over inlet/outlet alum tubing and mates up with the bottom of the thermo housing. I can see with a mirror were its seeping out, maybe a couple drops during an hour drive. T
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      09-22-2016, 04:07 PM   #8
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So you used brand new OE o-rings?
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      09-22-2016, 04:13 PM   #9
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Quote:
Originally Posted by sirdaft1 View Post
So you used brand new OE o-rings?
yep, both times. I took it apart last night a ran a fine bead of Black rtv on both sides of the o-ring and reinstalled. I'll take her for a ride or drive her to work tommarrow and see if stopped the leak. Makes no sense. I originally took the whole OFH off when I did my walnut blast and re-sealed everything with new oem gaskets. Its been six months and just started the drip.
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      09-23-2016, 04:48 PM   #10
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Any chance it's this gasket that's leaking?

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