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Thread: Help Needed: transmission oil cooler line replacement

  1. #1
    Join Date
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    Help Needed: transmission oil cooler line replacement

    Hi,

    My beloved 530i (M54 engine, 75k miles, 2003) has some oil leak issues. Last night, I found a bit of oil leaks and it turned out they are from the transmission oil cooler lines near the radiator. I googled and got the part numbers from realoem.com: the hoses (17221714511 &17221714512) and o-rings (172117426360). It's definitely from one of the hoses but I would replace the old o-rings, as well. My question is the tightening torques for the bolts (#8 & 15 in the diagram below). The Bentley manual does not help and I couldn't find the torque spec.

    Can anyone help me on this? How difficult is this job? I'm not a highly skilled DIYer but can use wrenches for minor repairs.
    Thanks in advance,

    JW
    Coolerlinesoverview.png Coolerlineleak01.jpg

  2. #2
    JimLev's Avatar
    JimLev is offline Artifically Aspirated Moderator
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    The bolt doesn't need to be that tight, maybe 10ft-lbs.
    The o-rings provide the seal, the bolt just keeps the pipes in place.

  3. #3
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    IIRC it's about 15nm. Put a little blue Loc-Tite on the bolt if you like. As Jim said, the o-rings do the work.

  4. #4
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    Help Needed: transmission oil cooler line replacement

    I think I’d replace the O-Rings and call it good.…or is it actually the hose/hardline that is causing the issue?

    Just apply hand pressure to the bolts with a short wrench.


    Sent from my iPhone using Tapatalk
    Last edited by bluptgm3; 03-26-2019 at 07:37 PM.

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