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  1. #11
    galadriel's Avatar
    galadriel is offline Registered User
    Location : Chichester Harbour
    Join Date
    Jan 2004
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    Quote Originally Posted by vyv_cox View Post
    Yes, that's my thought too. Symptoms are that the header tank only fills very slowly, so the seawater side pressure may only exceed the fresh water side for a couple of minutes from cold.
    That sort of makes sense, because until the thermostat opens, there will be no water circulating through the heat exchanger.

    There are two difficulties I have with this though, what Vyv alluded to before regarding the pressure differential, there is no area within the heat exchanger that is only separated by any kind on seal or gasket, its all brazed up, it would have to be a ruptured copper pipe. Second point the problem seems to be worse when the engine has been run hard for a long period of time.

    But I thank you all, I do have other areas to investigate now, but dont stop there, keep coming up with ideas!
    "You are young and life is long and there is time to kill today
    And then one day you find ten years have got behind you"
    Roger Waters 1972

  2. #12
    Join Date
    Apr 2005
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    3,537

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    The only way to be sure is to but a pressure test on various parts. Heat exchanger, calorifier. The generally accepted way is to positively isolate the unit under test (using plugs not valves which may leak slightly) apply test pressure with test pump, isolate test pump and monitor pressure drop over 24hrs. For best results monitor temperature as well and apply a correction. Don't apply to high a test pressure, refer to allowable pressure of component under test. Usually test to 1.5 times working pressure.
    This will reveal where the problem lies. Test pumps available from HSS to hire or Screwfix to buy.

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