ML battery, is it leaking?

Discussion in 'Engine' started by dokalj, Oct 7, 2011.

  1. dokalj

    dokalj Hardcore MB Enthusiast

    Messages:
    1,527
    Joined:
    Feb 23, 2009
    Hi all,

    I hope everyone is well.

    I have a question about the ML.

    Does this look like a leaking battery? I think it is, however would like to be told it isn't.

    Please see attached.

    Kind Regards

    dokalj
     
    Last edited: Aug 25, 2015
  2. Dieselman

    Dieselman Banned

    Messages:
    34,206
    Joined:
    Jul 13, 2003
    Car:
    Peugeot 403 Convertible
    Lift it out and have a look below. It looks like it's either been overfilled or is boiling due to over-charging.
     
    1 person likes this.
  3. OP
    OP
    dokalj

    dokalj Hardcore MB Enthusiast

    Messages:
    1,527
    Joined:
    Feb 23, 2009
    Last Picture.

    Thanks

    dokalj
     
    Last edited: Aug 25, 2015
  4. OP
    OP
    dokalj

    dokalj Hardcore MB Enthusiast

    Messages:
    1,527
    Joined:
    Feb 23, 2009
    Thanks for the quick reply. :)

    Over filled? Boiling due to over-charging?

    Are these batteries not sealed?

    Also with regards to over-charging why would that happen? Or do you mean using a charger and not the car?

    Thanks

    dokalj
     
  5. Dieselman

    Dieselman Banned

    Messages:
    34,206
    Joined:
    Jul 13, 2003
    Car:
    Peugeot 403 Convertible
    It's not a sealed battery, hence the caps to unscrew. Unscrew the caps and check the level, then check the charging voltage, it' should be 13.5-14.5v, no more, no less.
     
    1 person likes this.
  6. OP
    OP
    dokalj

    dokalj Hardcore MB Enthusiast

    Messages:
    1,527
    Joined:
    Feb 23, 2009
    If the voltage is around that and the distilled water does not look overfilled, what could it indicate?
     
  7. Dieselman

    Dieselman Banned

    Messages:
    34,206
    Joined:
    Jul 13, 2003
    Car:
    Peugeot 403 Convertible
    Then it looks like it's leaking, but from the top..??
     
    1 person likes this.
  8. Dec

    Dec Hardcore MB Enthusiast

    Messages:
    4,475
    Joined:
    Jul 28, 2004
    Car:
    C180,A.
    1 person likes this.
  9. OP
    OP
    dokalj

    dokalj Hardcore MB Enthusiast

    Messages:
    1,527
    Joined:
    Feb 23, 2009
    I am not sure where it is leaking from, if it is.

    I am suprised it has happened if not, something has happened.

    To be honest it has got worse.
     
  10. OP
    OP
    dokalj

    dokalj Hardcore MB Enthusiast

    Messages:
    1,527
    Joined:
    Feb 23, 2009
  11. Dec

    Dec Hardcore MB Enthusiast

    Messages:
    4,475
    Joined:
    Jul 28, 2004
    Car:
    C180,A.
    All car batteries should have vent holes, usually either end and as described in previous links.

    You need to remove the 6 cross head filler covers on the top of the battery and top up, so as to just cover each cell with DISTILLED water, obtain from your local Chemists or Halfords, you will then need to clean up the battery and the spilled battery acid on the paint work using plenty of boiling water.

    Dec
     
  12. Dieselman

    Dieselman Banned

    Messages:
    34,206
    Joined:
    Jul 13, 2003
    Car:
    Peugeot 403 Convertible
    How old is the battery. I suspect it has a dead cell so is boiling that cell when charging.
     
  13. Olivier

    Olivier Hardcore MB Enthusiast

    Messages:
    1,666
    Joined:
    Oct 30, 2008
    Location:
    Edinburgh
    Car:
    E300 TD
    My battery "bubble" when I charge it, this is not suppose to be?
    Cheers.
     
  14. Dieselman

    Dieselman Banned

    Messages:
    34,206
    Joined:
    Jul 13, 2003
    Car:
    Peugeot 403 Convertible
    All batteries bubble when charging, but it shouldn't be excessive.
     
    1 person likes this.
  15. Olivier

    Olivier Hardcore MB Enthusiast

    Messages:
    1,666
    Joined:
    Oct 30, 2008
    Location:
    Edinburgh
    Car:
    E300 TD
    thank you.
     
  16. OP
    OP
    dokalj

    dokalj Hardcore MB Enthusiast

    Messages:
    1,527
    Joined:
    Feb 23, 2009
    .....Update.....

    When the car is off the battery reads: 12.62V
    When the car is running the battery reads: 14.86V

    What would this deduce?

    Thanks

    dokalj
     
  17. DSM10000

    DSM10000 MB Club Veteran

    Messages:
    6,119
    Joined:
    Jul 12, 2011
    Location:
    Near Salisbury
    Car:
    E32O CDi Sport, MX5 1.8 Sport, RR 4.2 SC
    In the charged state, each cell contains electrodes of lead and lead oxide in an electrolyte of approximately 33.5% v/v sulphuric acid.
    In the discharged state both electrodes turn into lead sulphate and the electrolyte loses it’s dissolved sulphuric acid and becomes primarily water. This is why batteries that are discharged are more at risk of freezing in winter battery
    When you charge a battery you are changing the lead sulphates into lead and lead oxides. The process is driven by the forcing the removal of electrons from the anode and the transfer of them to the cathode,
    Charging generates oxygen and hydrogen gas by electrolysis of water, which is lost to the cell, hence the bubbling when charging and the need for venting.

     
    Last edited: Oct 8, 2011
  18. OP
    OP
    dokalj

    dokalj Hardcore MB Enthusiast

    Messages:
    1,527
    Joined:
    Feb 23, 2009
    Does this mean my battery is fine?

    I did open up the screws and the second screw closer to the driver was wet around the screw. I still have liquid around the base of the battery and the reservoirs were not filled to the top.
     
  19. Dieselman

    Dieselman Banned

    Messages:
    34,206
    Joined:
    Jul 13, 2003
    Car:
    Peugeot 403 Convertible
    The charge voltage looks a bit high, which could cause boiling.
     
  20. OP
    OP
    dokalj

    dokalj Hardcore MB Enthusiast

    Messages:
    1,527
    Joined:
    Feb 23, 2009
    Are you hinting at the alternator Dieselman?
     

Share This Page

  1. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
    By continuing to use this site, you are consenting to our use of cookies.