BMWs and water

Thread in 'Other Chat' started by CBRParr, Jan 7, 2014.

  1. CBRParr

    CBRParr Active Member

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    So, a week before Christmas I finally bought myself an E60 530d M sport. I'd wanted one for a while, having been in little Japanese cars low to the floor I wanted to know what big powerful and lazy felt like. I was also doing a lot of motorway miles. But, it lasted a week before mother nature took that from me. I came upon a puddle (burst river banks as we later found out) and hesitated before crossing. At this time I was overtaken by a yaris and an RX8 who seemed to get through no problem. So I followed suit, about halfway in, the revs died and that was that. We pushed the car out of the water and got it recovered.

    To see what the damage was I stripped back the intake system and the intercooler which i'm pretty sure could have filled up a small bath or a large sink at this point. As this was at the side of the road I couldn't really go much further so I handed it over to a garage to do some deeper engine checks. I've had the phone call today to say the engine is beyond economic repair. Great.

    As much as it sounds like a sob story this is an opportunity for me to pass on what I learnt, the very expensive and hard way.


    - BMWs have very low air intakes, the only other car (out of a good 25) that died in this particular stretch of water was... another BMW.

    - If you have water in your intercooler; you're going to have a bad time.

    - When garages check to see if your car has been 'hydrolocked' they strip back the air system and do a compression test. You can do a lot of this yourself and it will save you a heap in labour.

    - When driving through deep water just try to keep it slow and steady, speed lifts the water up over the front.

    - Keep revs reasonably high to stop water getting in the exhaust

    - If the car does die in the water, do not try and start it immediately, this will probably just pump water further round the intake system and probably into your engine.

    This may seem obvious to many and I knew most of it and still got caught out but I assume a lot of drivers on here do not. I'm assuming some abuse will come my way as to why I drove into the puddle but when you're trying to get home on Christmas eve (and an RX8 can do it) it seemed pretty safe.

    :thumbs:
     
  2. LiamE36

    LiamE36 Active Member

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    I take it the garage did the compression test after they pumped the water out of the bores?
     
  3. j0ns

    j0ns Member

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    Was gonna say! Forget the compression test if there's water in there!
     
  4. bell

    bell Without patience

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    you can also remove the injectors and other ancilleries and crank the engine to remove water, drop the oil and change the fuel filter.
    that is if you havent decided to try and start it after you've hydrolocked it.
    had to do this on a 306 and on many a land rover after going wading without snorkles.
     
  5. LiamE36

    LiamE36 Active Member

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    Like bell has said, once the water is out as long as it hasnt been started or cranked over, most times out of ten they're alright.
     
  6. J4CK

    J4CK Member

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    Been there done that...
    First car, week before xmas,
    Banana'd valves, Cracked Block. Cracked head.
    [​IMG]

    [​IMG]
     
  7. luca24

    luca24 Member

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    We have managed to save a lot of BMW diesel's with same problem, as bell said is absolutely right the only other thing you may require is an air mass sensor but see how she runs after removing as much H2O as possible :thumbs:
     
  8. DH_

    DH_ New Member

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    Wow, should probably stop being a child by driving my car through puddles then...
     
  9. CBRParr

    CBRParr Active Member

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    Well that gives me hope. I'm not goo clued up on Diesel engines. And unfortunately have nowhere to work on it except the side of the road so will have to see what I can do.
     
  10. Tricky5

    Tricky5 New Member

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    Running a E46 3 series they arent all bad as my intake is top of the kidneys but talking to my mate down at the independat specialist he does say the newer 5 series are the worst for this as their intake is down low infront of the front wheels.... great till theres a big puddle :/
     
  11. Rhys

    Rhys Member

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    The best thing to do when going threw deep water is to drive behind the bowl wave, so as ur car goes in the water it makes a wave as this happens ease back from the wave so u are going threw the most shallow bit, the amount off dickheads I see reving the nuts off a car while pushing the wave along is comical
     

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