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  1. #1
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    Yes | No

    Coolant leak @ rear of motor

    I moved my car last night from my inclined driveway and saw a puddle of coolant on the ground where the motor meets the gearbox. I assumed it was the valley pan leaking, well i took a look with a mirror at the back of the intake and the valley pan is dry. I can see the gear box was a little wet. Where else can i be leaking?
    Does the water pump have to come out along with the intake to do the valley pan job? sux cause my water pump and stat are only 1 year old and i dont believe in reusing water pumps once they come out.

    Andreas
    Queens NY
    BMWCCA# 186796
    86 325es (wrecked by careless driver)
    87 325 300k (project for life)
    00 540is 6spd 180k (daily driver)

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    Yes | No

    Check the heater hoses


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    Definitely check the hoses

    I had a leak back there on the wife's 99 540 and that's what it was. Not much fun to replace but better than the valley pan gasket.

  4. #4
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    Yes | No

    If it's not the valley pan or what BC said you (m)

    better hope it's not coming from #9 or 10 behind the flywheel
    Also check where the rear cross over pipe connects to the back side of both heads.

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    Yes | No

    I had to replace that rear plate on my 540


  6. #6
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    wow now i hope its the valley pan...

    &%$*&*& this sux, its never ending leaks with this car. I'm gonna get it on a lift this week and locate this leak. If it is the valley pan what other parts will need replacing? Are the accumulators on the backside know to leak? In this write up the guy replaces them too.
    http://www.magnum1.com/BMW-740/740_P...y-Pan-740.html
    I'm gonna go the way he did without taking the water pump out.
    I'm going to add the CCV valve on the list even though it looks like its been replaced. What else will break or need replacing while I'm at this job?

    Andreas
    Queens NY
    BMWCCA# 186796
    86 325es (wrecked by careless driver)
    87 325 300k (project for life)
    00 540is 6spd 180k (daily driver)

  7. #7
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    Re: wow now i hope its the valley pan...

    disregard the accumulator question, i misunderstood the write up

    Andreas
    Queens NY
    BMWCCA# 186796
    86 325es (wrecked by careless driver)
    87 325 300k (project for life)
    00 540is 6spd 180k (daily driver)

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    Good luck. Hope you can fix it easily >>

    The endless leaks on the 540 was a primary factor for me when deciding to get rid of it. Even after a leak was repaired, I constantly worried and looked under the car in anticipation of the next one. Shouldn't have to worry so much about a car.

    Interesting that William also mentioned leaks on his car as deciding factor to move on. IMO, the 540 is fun but life is too short to fret over it.

    Good luck with yours.

  9. #9
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    Yup, one of the new leaks I found was coolant

    In fact this post by Whorse was almost identical to what I started seeing in the last month and a 1/2 or so. My valley pan also looked dry, and the heater hoses appeared to be dry as well, so it all pointed to the back of the engine and/or an internal leak in the AC's Evaporator/Expansion Valve. The coolant leak was not huge, but it was not consistent either - it did not happen every single time I drove the car. But as I mentioned in my Good-Bye note, I simply could not find enough time with all of my recent/frequent travel to properly diagnose and repair the problem(s). I still had a few oil and ATF leaks in the PS reservoir that I was trying to get fix (more of an annoyance), but this coolant leak was the main thing that had me worried about possibly being stranded, so that was the final factor to let the 540i go. I really miss my 540i but now I don't have to worry about being left stranded.
    William
    Richardson, Texas
    2011 Honda Civic Si, 4-door (my car)
    2010 Honda Accord EX, 4-cyl, auto-tranny (her car)

    Retired/sold:
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    2006 Dodge Charger Daytona - Top Banana
    2005 BMW 330i Auto, Premium Package
    2002 M3 Coupe with SMG
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  10. #10
    tvlodek
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    Yes | No

    JimLev and BC, what does it mean if it's leaking

    behind the flywheel? BC, what plate did you have to replace? I have severe leak and the fluid appears to be coming out the inspection hole in the bellhousing. I'm hoping it's the valley pan gasket as I don't want to think of what I'm up against if it's not......

  11. #11
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    If it's the valley pan the 2 drain holes for it (m

    will drain coolant between the block and the flywheel. It will then come out the holes at the bottom of the tranny.
    If it's not the valley pan or the connecting pipe between the back of the heads or the hoses back there, then it's coming from the cover on the back of the block. That requires the flywheel to be removed to gain access to fix it.
    Thought all of that info was in the link above.

  12. #12
    tvlodek
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    Yes | No

    It was in the link but I wasn't exactly sure what

    I was looking at, I've never seen anything like that before. I'm mostly familiar with old American v8's and Japanese 4 and 6 bangers, I'm not that familiar with BMWs. I have no idea what the function of that plate is, I'm going to guess it's part of the water jacket, instead of being cast in, it's bolted on? Everything on this car is different than what I'm used to, and a real education. Thanks for all your help.

  13. #13
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    Yes | No

    Here's a pic of the drain/weep holes

    Picture of weep holes Jim was talking about. From what Ive read and experienced the valley pan is a slow inconsistent leak not severe like you mentioned.




    Lots of good write ups including valley pan if you need it.

    Andreas
    Queens NY
    BMWCCA# 186796
    86 325es (wrecked by careless driver)
    87 325 300k (project for life) aka 1BADETA/Christine
    00 540is 6spd 180k (daily driver)

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    Yes | No

    Water pump is left alone for valley pan job


  15. #15
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    No-it has 2B removed 2get the 2pipes off above VP






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  16. #16
    rwthomas1
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    Re: No-it has 2B removed 2get the 2pipes off above VP

    FWIW, when I did my valley pan I left the WP alone and removed the water crossover at the rear of the engine. Seemed easier at the time.... Bavauto's kit had those gaskets included. RT

  17. #17
    mlane
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    Yes | No

    I did same as rwthomas1 for my valley pan job


  18. #18
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    Never thought of doing it that way because if you(

    broke one of those bolts that go into the back of the head it would be a bummer of a job to get it out.
    Whorse, when you do the CCV get yourself M6 x 1.0 x 25 mm bolts to replace those torx bolts.

  19. #19
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    Re: No-it has 2B removed 2get the 2pipes off above VP

    got a link to the bav auto kit?

    Andreas
    Queens NY
    BMWCCA# 186796
    86 325es (wrecked by careless driver)
    87 325 300k (project for life)
    00 540is 6spd 180k (daily driver)

  20. #20
    rwthomas1
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    Re: No-it has 2B removed 2get the 2pipes off above VP

    Just search "valley pan kit" at bavauto.
    RT

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