Expansion tank fitting
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  1. #1
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    V8107e is offline

    Expansion tank fitting

    Next question I need answering, my 302 keeps chucking water out the overflow when it gets hot, I've been told to fit an expansion tank to remedy it. On my rad, it's got the take-off under the cap for an overflow and on the opposite side of the rad at the top, there's an inlet/outlet that's been blanked off. So the question is where do I plumb the outlet from the expansion tank to? (If that makes sense!!) Cheers

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    Official RnS Addict Perfect65's Avatar
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    I had a similar thing because I was putting too much coolant in. I fitted an open catch tank on the overflow to monitor the outflow and found no problem if I just about topped the core tubes in the header. If you have a tall rad it's surprising how much the level rises when hot but of course you cannot check it without scolding yourself.
    If you want a sealed system where the overspill is drawn back when the engine cools you need an expansion tank with its own pressure cap and the current filler neck has a non pressure cap that Is just for topping up on first fill. All my own experience but others may offer a different opinion of course.
    Greatest discombobulations to all my readers.

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    stick the drain pipe from the pressure cap in a bottle. it will catch the water that spill out and suck it back in when the engine cool's down.provided you have a pressure cap
    with a return valve

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