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Thread: Oil Inlet + Outlet o rings replacement

  1. #1
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    740iL (E38 '01)

    Oil Inlet + Outlet o rings replacement

    I have noticed that I had a small leak on the engine side of these hoses, they are hard to see or even notice the leak.
    Sharing my experience to save you some time.
    Here is the RealOEM link to the parts: http://www.realoem.com/bmw/enUS/show...diagId=11_1414
    Talking about #10 o-rings, but when you are there you probably should replace #7 as well:


    After removing the nut from the driver side engine mount, I have lifted the engine 50mm. Keep in mind that BMW say it should be lifted max 25mm, but that's not really enough to do this job.
    Since I dont have a proper lift, just jacked it up from the oil pan:

    DSC07106.jpg

    You need an ultra long socket extender to access nut #12 from above, I was using a 24'' long one.
    DSC07107.jpg
    Before you start removing the hoses release the oil filter cap so most of the oil in the filter housing will go down to the engine. You will still lose some, have your towels ready.
    Getting out the hoses are easy, just remove the nut #12 and #9 and the they will come out.
    Here they are, probably first time in 18 years disconnected from the engine:
    DSC07110.jpg

    Old o-rings on the top, new ones at the bottom. Old ones didnt look too bad.
    DSC07112.jpg
    Attached Images Attached Images
    Last edited by georgebest; 01-12-2019 at 10:20 PM.

  2. #2
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    Hoses nice and clean ready to go back with new o-rings installed:
    DSC07111.jpg

    ...and this is the best way I could come up with putting it back in. You have very limited access to the space, it's a real PITA to put it back on the engine side. This mask tape setup works really well though:
    DSC07115.jpg

    After you managed to put it back on the engine side, use a mirror to check if properly aligned. If you forget to do that and start your engine you will end up a few liters of engine oil on your floor. Guess how I have learnt that...
    Once installed you can remove the masking tape with some long plier.
    Putting the nut back on the engine side could be difficult, I have used my extension socket with another flexible extension and gasket stick to keep the nut in the socket, this worked really well:

    DSC07118.jpg

    That's basically it. Took me probably 2 hours, not including cleaning up my floor
    Best advice: do it when you do the timing chain guides, this would have been so much easier then. But still can be done as a standalone job.
    Last edited by georgebest; 01-12-2019 at 10:25 PM.

  3. #3
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    99 840ci Sport Indv
    Great work! I've never seen one of those pipes that don't 'sweat' a little bit!
    Timm..2007 E64 650i Individual Sport..1999 E31 840ci Individual Sport..ex owner of 2000 E38 740..1999 E38 740i V8 M62..1998 E38 735i V8..1993 E32 730i V8..1988 E28 518i


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  4. #4
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    Thanks, Timm! I think the pipes are rather well made, but it's so hard to access them on the engine side (unless you have the bottom timing cover off) that they often just get neglected. Honestly, I was hesitating to do it as well, cause it wasn't leaking too badly. But what else would you spend your Saturday afternoon on, right?
    With all other gaskets and o-rings replaced, I should have no leak on the front of the engine from now on.
    This car is coming along really nicely, very happy with the progress. Thanks to the great help of you and the rest of the forum, of course!

  5. #5
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    98 740il, 00 540i
    Good job! Not easy at all. But you can spend a Saturday afternoon fiddling with the transmission selector seal o-ring
    1998 740il | 9/97 build | 233k | schwarz 2 | sandbeige
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  6. #6
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    Quote Originally Posted by racer2086 View Post
    Good job! Not easy at all. But you can spend a Saturday afternoon fiddling with the transmission selector seal o-ring
    Next on the menu! hasnt arrived yet and it will be likely freezing in my garage over the weekend, rather waiting for a bit better weather. Though I noticed that I work faster in cold!

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