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328 cooling liquid leakage

Discussion in 'Technical Q&A' started by flyingboa, Dec 27, 2003.

  1. flyingboa

    flyingboa Formula 3

    Nov 27, 2003
    1,551
    Italy/India
    Full Name:
    Eugenio
    I have noticed a leakage from the drain of the cooling expansion tank when the temperature rises to normal levels. Liquid level is now 8 cm below the level of the filler plug base (6 cm recommended).
    As the car was not driven for a long period, could this leak be due to the filler cap spring being too old?
    Does anybody else eperienced anything similar?
    Thanks for help
     
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  3. MarkCollins

    MarkCollins F1 Rookie
    Owner

    Jul 2, 2002
    3,198
    South England
    Full Name:
    Mark Collins
    I had this on my 328, turned out to be a faulty expansion cap, bought anotehr for mFerrari UK (£15!!!!) which turned out to be a slightly higher rating and it sorted the problem
     
  4. DBR328&330

    DBR328&330 Formula Junior

    May 31, 2001
    605
    Winchester, VA
    Full Name:
    Daniel Reese
    Yes it could be your cap but it may also be normal. When was the coolant last changed? After a coolant change it takes a while for the coolant volume to find equilibrium and stop leaking from drain hose- Mine is still occasionally dripping after two months but it will settle down soon.
     
  5. Verell

    Verell F1 Veteran
    Consultant Owner

    May 5, 2001
    6,993
    Groton, MA
    Full Name:
    Verell Boaen
    Another cause could an air bubble somewhere in the system. Try bleeding using the radiator & thermostat bleed valves. Search the archives for bleeding procedures, I & others have written them up several times.
     
  6. KurtK328

    KurtK328 Formula Junior

    Mar 6, 2001
    347
    Villeneuve-Loubet, France
    Full Name:
    Kurt Kjelgaard
    Buy a new filler cap.
    Old ones (0.9 bar) are replaced by 1.1 bar dittos.
     
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  8. carlrose

    carlrose Formula Junior

    Nov 25, 2003
    295
    One thought here -

    Radiator cap is the most common etiology (especially if original) with slight overflow drain. Depending on how diagnostically determined you are (i.e. replacing cap is simple), five main causes of reduction in AF levels:

    1. Overheating/boiling off (incorrect mixture, engine variables, poorly-functioning radiator, failing water pump/belt)
    2. Faulty cap - no longer able to hold sufficient pressure.
    3. Internal leakage - typically ruptured cylinder head gasket (but would usually run roughly, overheat rapidly, and put out white smoke in exhaust)
    4. External leaks - hoses/fittings/clamps. Notable areas on 328 are origin of heater hose at manifold and occult heater core leakage.
    5. Overfilled system - (doesn't sound as if this is case).

    Thread on JRVs board recently about replacement Alfa Romeo (?) cap for about $5 or as others have noted OEM is about $20-25. If you want to "prove" faulty cap prior to replacement most auto parts stores can test caps on pressure device (although unsure if you;d be able to find proper adaptor for this cap).

    (everyone feel free to critique my analysis)

    :) Carl
     
  9. Ron328

    Ron328 F1 Rookie
    Silver Subscribed

    Mar 10, 2003
    2,559
    Willamette Valley, Oregon
    Full Name:
    Ron
     

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