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Radiator Cap Failing

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  • Radiator Cap Failing

    Hello,

    I have a 1.7 diesel Cummings mercruiser, had the boat for around 12 years.

    When the boat gets warm the coolant gets pushed into the expansion vessel which is fine, but it does not get sucked back in, so spurts out until coolant is empty.
    The heat exchanger is clean and I don't think it's the head gasket.

    What pressure cap do I require?
    I have a new 2bar cap on at the moment but the problem persists.
    Any help would be great.
    Thanks
    Jake
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