Oil Cooler Hose

twosickz · 05-23-2015, 04:42 PM

Any idea why I keep getting this oil leak around the oil cooler lines after performing the oil filter housing gasket DIY?

I've replaced both oil cooler line o rings with brand new oem ones. Am I over tightening this bolt?

pagedownhere · 11-26-2017, 07:51 AM

Any luck on this? I replaced my ofhg and reused the 2 o-rings you mention as I didnt have new ones on hand. It started leaking so i relaced them with new ones from the dealer. Seems to still leak from those 2 o-rings. I tightened it pretty damn good. Any suggestions?
Thanks!!

Stroker1 · 11-26-2017, 12:59 PM

Looks like quite alot of corrosion in area. My guess is the bore and fitting grooves weren't cleaned well enough prior to assenbly I would clean bores and oring grooves on fittings, lube the orings before assembly and torque to specs.

twosickz · 11-27-2017, 10:20 AM

Quote:

Originally Posted by pagedownhere

Any luck on this? I replaced my ofhg and reused the 2 o-rings you mention as I didnt have new ones on hand. It started leaking so i relaced them with new ones from the dealer. Seems to still leak from those 2 o-rings. I tightened it pretty damn good. Any suggestions?
Thanks!!

After weeks & weeks, I figured it out. It ended up being this cap gasket, that is highlighted in yellow, causing the leak.

I removed the 2 screws holding the cap and put silicone gasket maker and it hasn't leaked since.

pagedownhere · 11-27-2017, 12:39 PM

twosickz Thanks! I will check that out! I was going to put some black RTV gasket maker on the 2 oil cooler connections as well. It wouldn't hurt to put it on all 3 spots would it?

twosickz · 11-27-2017, 12:55 PM

Quote:

Originally Posted by pagedownhere

twosickz Thanks! I will check that out! I was going to put some black RTV gasket maker on the 2 oil cooler connections as well. It wouldn't hurt to put it on all 3 spots would it?

Don't put any gasket maker in the o ring connections. Just the cap and very little aswell.

Jklad · 11-28-2017, 08:44 AM

Quote:

Originally Posted by twosickz

Quote:

Originally Posted by pagedownhere

Any luck on this? I replaced my ofhg and reused the 2 o-rings you mention as I didnt have new ones on hand. It started leaking so i relaced them with new ones from the dealer. Seems to still leak from those 2 o-rings. I tightened it pretty damn good. Any suggestions?
Thanks!!

After weeks & weeks, I figured it out. It ended up being this cap gasket, that is highlighted in yellow, causing the leak.

I removed the 2 screws holding the cap and put silicone gasket maker and it hasn't leaked since.

Is it possible to purchase the gasket for that cap seperately? I've looked all over realoem and can't find it listed. the aftermarket oil cooler tstat vendors do not sell it either. Mine's been seeping oil for a bit.

twosickz · 11-28-2017, 10:14 AM

Quote:

Originally Posted by Jklad

Is it possible to purchase the gasket for that cap seperately? I've looked all over realoem and can't find it listed. the aftermarket oil cooler tstat vendors do not sell it either. Mine's been seeping oil for a bit.

Not sure. I would ask your local bmw parts dept & provide vin.

pagedownhere · 01-10-2018, 06:54 AM

By the way twosickz is spot on with this! Popped off the oil cooler stat cover, added a small amount of black gasket maker and havent had an issue since!

thanks!

feuer · 01-10-2018, 08:28 AM

Quote:

Originally Posted by Jklad

Is it possible to purchase the gasket for that cap seperately? I've looked all over realoem and can't find it listed. the aftermarket oil cooler tstat vendors do not sell it either. Mine's been seeping oil for a bit.

No gasket replacement. No thermostat replacement either. Silicone would be only option.

Tallicia · 11-12-2019, 10:17 AM

This is going to become a much much more important thing to know as these incredible motors get into their truly appreciated years!

I've been chasing this leak all year. I see aftermarket a $50 replacement with seal for the thermostat cover.

Thanks for confirming my suspicions. I replace the OFH gaskets twice, and just replaced o-rings a second time. This is the only other possible place and it sure does it in a very hidden way. Grrr.

It's a real real shame there isn't a $10 gasket that can be purchased to replace this!

EconIsLyfe · 02-12-2020, 05:15 PM

FTP has a thermostat cover kit for $45 on ECS Tuning. Comes with the cover, new bolts, and a new gasket.

https://www.ecstuning.com/b-ftp-motorsport-parts/ftp-thermostat-cover-kit/sg84006-ct~ftp/?gclid=CjwKCAiA4Y7yBRB8EiwADV1haeOOmXZks9SU5dyBK5s QiPPq8UUtZ4eVT3HmKyZ2hw27k6iLMOacXBoCXu4QAvD_BwE

rgfinn76 · 02-12-2020, 06:44 PM

What is the correct torque on the 13mm bolt holding the H plate and oil cooler lines in place?? I looked all over and cannot find the proper torque.

I just got don't replace the OFHG and see the same little oil residue leaking as in the picture above.

EconIsLyfe · 02-13-2020, 05:31 AM

Quote:

Originally Posted by rgfinn76

What is the correct torque on the 13mm bolt holding the H plate and oil cooler lines in place?? I looked all over and cannot find the proper torque.

I just got don't replace the OFHG and see the same little oil residue leaking as in the picture above.

The oil lines will leak right there even with new O-rings because the plate that holds them down bends (like in the picture if you look closely). It can be heated and bent back, replaced for $180 each line, or converted to 10AN (this is the option I went with)

rgfinn76 · 02-15-2020, 11:06 AM

I replaced the O rings again this morning. I noticed it’s leaking from damn cover and not the cooler lines.

Guess I’ll get the placement kit from ECS.

BarraCuda · 06-12-2020, 07:46 AM

Quote:

Originally Posted by EconIsLyfe

The oil lines will leak right there even with new O-rings because the plate that holds them down bends (like in the picture if you look closely). It can be heated and bent back, replaced for $180 each line, or converted to 10AN (this is the option I went with)

EconIsLyfe, thank you! Seems like the best option on this (I hate doing a job more than once) can you give a quick step by step on the conversion for us, I found some 10an fittings, would you have a parts list?

jin · 09-21-2020, 08:37 PM

Quote:

Originally Posted by EconIsLyfe

The oil lines will leak right there even with new O-rings because the plate that holds them down bends (like in the picture if you look closely). It can be heated and bent back, replaced for $180 each line, or converted to 10AN (this is the option I went with)

I think I have this problem. What is the adapter plate you used for the oil lines? Can you use the adapter with the stock oil lines?

chance91 · 11-08-2021, 06:10 PM

Quote:

Originally Posted by feuer

No gasket replacement. No thermostat replacement either. Silicone would be only option.

Just wanted to give back here. Came up in a search and found the solution for that cover.
An oring sized
37 mm ID, 43 mm OD, 3 mm Width

Works perfectly. Used in a few of my cars now.

https://www.amazon.com/gp/aw/d/B005RUTCYI/ref=ppx_yo_mob_b_inactive_ship_o0_img?ie=UTF8&psc= 1

Wolf 335 · 11-09-2021, 01:05 PM

Quote:

Originally Posted by chance91

Just wanted to give back here. Came up in a search and found the solution for that cover.
An oring sized
37 mm ID, 43 mm OD, 3 mm Width

Works perfectly. Used in a few of my cars now.

https://www.amazon.com/gp/aw/d/B005R...?ie=UTF8&psc=1

Link to o-ring thread:

Make sure you get the Viton material o-ring.

05-23-2015, 04:42 PM	#1
twosickz Second Lieutenant 51 Rep 217 Posts Drives: 335i single turbo Join Date: Aug 2014 Location: Tri-Cities, WA State. iTrader: (2)	Oil Cooler Hose - Oil leak help. Any idea why I keep getting this oil leak around the oil cooler lines after performing the oil filter housing gasket DIY? I've replaced both oil cooler line o rings with brand new oem ones. Am I over tightening this bolt? Attached Images
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11-26-2017, 07:51 AM	#2
pagedownhere Enlisted Member 6 Rep 34 Posts Drives: 07 335i Join Date: Nov 2016 Location: Delaware iTrader: (2)	Any luck on this? I replaced my ofhg and reused the 2 o-rings you mention as I didnt have new ones on hand. It started leaking so i relaced them with new ones from the dealer. Seems to still leak from those 2 o-rings. I tightened it pretty damn good. Any suggestions? Thanks!!
	Appreciate 0 Quote

11-26-2017, 12:59 PM	#3
Stroker1 Private 35 Rep 91 Posts Drives: 07 335 cp dci, ***dp's, jb4 Join Date: Sep 2015 Location: atlanta ga iTrader: (0)	Looks like quite alot of corrosion in area. My guess is the bore and fitting grooves weren't cleaned well enough prior to assenbly I would clean bores and oring grooves on fittings, lube the orings before assembly and torque to specs.
	Appreciate 0 Quote

11-27-2017, 12:39 PM	#5
pagedownhere Enlisted Member 6 Rep 34 Posts Drives: 07 335i Join Date: Nov 2016 Location: Delaware iTrader: (2)	twosickz Thanks! I will check that out! I was going to put some black RTV gasket maker on the 2 oil cooler connections as well. It wouldn't hurt to put it on all 3 spots would it?
	Appreciate 0 Quote

01-10-2018, 06:54 AM	#9
pagedownhere Enlisted Member 6 Rep 34 Posts Drives: 07 335i Join Date: Nov 2016 Location: Delaware iTrader: (2)	By the way twosickz is spot on with this! Popped off the oil cooler stat cover, added a small amount of black gasket maker and havent had an issue since! thanks!
	Appreciate 1 Tallicia73.50 Quote

11-12-2019, 10:17 AM	#11
Tallicia Private First Class 74 Rep 141 Posts Drives: X6 and 1 series Join Date: Jun 2016 Location: DFW, TX iTrader: (2) Garage List 2013 X6 [0.00] 2011 BMW 135i M Spo ... [0.00]	This is going to become a much much more important thing to know as these incredible motors get into their truly appreciated years! I've been chasing this leak all year. I see aftermarket a $50 replacement with seal for the thermostat cover. Thanks for confirming my suspicions. I replace the OFH gaskets twice, and just replaced o-rings a second time. This is the only other possible place and it sure does it in a very hidden way. Grrr. It's a real real shame there isn't a $10 gasket that can be purchased to replace this! __________________
	Appreciate 0 Quote

02-12-2020, 05:15 PM	#12
EconIsLyfe Registered 2 Rep 2 Posts Drives: 2008 335i 6MT Join Date: Apr 2018 Location: San Antonio iTrader: (0)	FTP has a thermostat cover kit for $45 on ECS Tuning. Comes with the cover, new bolts, and a new gasket. https://www.ecstuning.com/b-ftp-motorsport-parts/ftp-thermostat-cover-kit/sg84006-ct~ftp/?gclid=CjwKCAiA4Y7yBRB8EiwADV1haeOOmXZks9SU5dyBK5s QiPPq8UUtZ4eVT3HmKyZ2hw27k6iLMOacXBoCXu4QAvD_BwE
	Appreciate 1 feuer4275.50 Quote

02-12-2020, 06:44 PM	#13
rgfinn76 Second Lieutenant 47 Rep 203 Posts Drives: 2008 335i Sport Coupe Join Date: Dec 2015 Location: Tampa, FL iTrader: (0)	What is the correct torque on the 13mm bolt holding the H plate and oil cooler lines in place?? I looked all over and cannot find the proper torque. I just got don't replace the OFHG and see the same little oil residue leaking as in the picture above.
	Appreciate 0 Quote

02-15-2020, 11:06 AM	#15
rgfinn76 Second Lieutenant 47 Rep 203 Posts Drives: 2008 335i Sport Coupe Join Date: Dec 2015 Location: Tampa, FL iTrader: (0)	I replaced the O rings again this morning. I noticed it’s leaking from damn cover and not the cooler lines. Guess I’ll get the placement kit from ECS.
	Appreciate 0 Quote