Help identifying E46 M3 engine coolant part

Discussion in 'Faults, Fixes and Solutions' started by Castanea, Dec 8, 2017.

  1. 8 Dec 2017 at 9:23 PM #1
    Castanea

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    Can anyone help in identifying a part (picture below) for me?

    My starter needs replacing so I've managed to get it out (after much
    swearing and self-encouragement!) but I noticed a wet patch behind it
    and have located the source of the leak, which is the joint between a solid
    steel pipe coming from the water-pump (pipe B outlined in blue) and a hard
    plastic union (A) on the end of a rubber hose outlined in pink which I think is
    something to do with the interior heater.
    I suspect the leak may have dripped onto the starter motor and caused it to
    "play-up", leaving me embarassingly unable to start the car on a few
    occasions. :eek:

    I can't find hose A or the union on the end of it on Realoem.
    It must have an "O"-ring or similar inside the union to seal it on the metal
    pipe.

    Pipe B is 7830714 and I found that under Engine->Cooling System->Cooling System Water Hoses.

    Before I go to the trouble of draining the cooling system can someone tell me
    if I need to replace the pink hose A or simply replace an "O"-ring inside its
    union?

    If I do need to replace it, what is it called and what is its part number?

    Thanks for any help.

    Mick

    [​IMG]
     
  2. 8 Dec 2017 at 9:27 PM #2
    HARBER07

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  3. 8 Dec 2017 at 9:28 PM #3
    HARBER07

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    Under heating :thumbsup:
     
  4. 8 Dec 2017 at 9:34 PM #4
    Castanea

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    Thanks for replying.

    I looked at that page on Realoem but their drawing doesn't look anything like the part in question.
    From their drawing it looks as though the hose connects to the engine block/head in some vague way so I had discounted it.

    Are you sure it's the one in my photo?

    Have you had your hands on the hose and do you know how it seals onto the pipe?

    I just need to confirm so I can order the releveant part(s) from my dealer.
     
  5. 9 Dec 2017 at 9:22 AM #5
    HARBER07

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    Take RealOEM with a pinch of salt. They are generic drawings they use and not necessarily tailored to each car.

    Google the part number, it looks correct. The connection points on RealOEM are correct - one to the block hard pipe and one to the heater matrix.

    One end looks to be a jubilee clip, the other end will be the BMW push fit system.
     
  6. 9 Dec 2017 at 11:38 AM #6
    Mrd1984

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    thats a really common place for a coolant leak and especially if you're changing the starter motor it can get knocked.
    I personally don't see the need to replace the pipe. once pressure gains in the system the coupling will straighten out and the leak will stop. At most maybe replace an Oring
     
  7. 9 Dec 2017 at 12:41 PM #7
    Castanea

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    You're right, I did google the part and a number of suppliers have a picture of the actual part which is the one I am referring to :thumbsup:

    I've not noticed any loss of coolant before so I'm going to leave it and hope it does as you say. I really don't want to drain the cooling system which I'd have to do anyway even to replace just the O-ring.
     
  8. 9 Dec 2017 at 1:09 PM #8
    HARBER07

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    I can see the mans point, but personally I'd change that pipe now while there is access. It shouldn't leak at all even if its knocked. You'll regret it when you have to take the inlet off again!
     
  9. 9 Dec 2017 at 8:41 PM #9
    Castanea

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    Well I hope he's right and you're wrong as it's all back together now and tomorrow I'll be starting her up!

    I'm getting quite good at installing/removing the airbox (a genuine CSL one and a VERY tight fit) as I've already had it off once to replace a throttle actuator and now a second time for the starter motor.

    Keeping my fingers crossed I don't need to do it a third time!

    Thanks for your input though.
     
  10. 10 Dec 2017 at 12:24 PM #10
    paulclaude

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    I've experienced that coolant pipe joint leak if disturbed while working on a couple of S54's - as Mrd1984 says, once the system pressures up you should have no leak. I think the type of connection it uses relies on system pressure to force it 'outward' and maintain a seal.
     
  11. 9 Oct 2019 at 3:30 PM #11
    AC427

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    Thread revival.

    Is there even a part number for the O ring?
     
  12. 12 Oct 2019 at 7:55 PM #12
    Castanea

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    Don't think so, I bought the complete pipe assembly in the end but left the old one in place after replacing the Starter and, touch wood, it's been fine since....athough I won't really know whether the leaking pipe was causing the starter to play up or not as it's been fine since and coolant level is stable.
     

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