Westerbeke 4107 heat exchanger question - SailNet Community
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post #1 of 4 Old 06-13-2012 Thread Starter
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Westerbeke 4107 heat exchanger question

Pulled the heat exchanger off our 4-107 and took it to a shop to be boiled and pressure tested. It's now painted and ready to put back in.

On removal, about a half a gallon of coolant drained from the hose leading from the manifold to the heat exchanger, as well as from the hose leading from the heat exchanger to the engine. Is there another drain point on this engine to get any remaining coolant out? I couldn't find anything in the manual about draining or flushing the system.

As far as reinstalling the heat exchanger, is it as simple as reattaching the hoses, topping off with a 50/50 coolant/water mix and starting the engine? Or are there problems to be expected or something that I'm missing?

Thanks for any advice, I'm fairly new at working on this beast of an engine and I'd prefer to not screw anything up too badly.
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post #2 of 4 Old 06-13-2012
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Re: Westerbeke 4107 heat exchanger question

There are likely to be some air bubbles in the passageways upon startup.. I usually run for the first few minutes with the pressure cap off.. the air can escape then, and you may be able to note the level drop and stabilize when the air leaves the system.. top up one last time and you should be good to go.


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Re: Westerbeke 4107 heat exchanger question

Awesome, sounds easy enough. Thanks so much!
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post #4 of 4 Old 06-13-2012
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There's a drain but there's always a mess. I always have a shop vac handy when pulling the tube stack. As it's slightly tilted, leave the cap off when you start the engine and it will burp itself.
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