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Old 12-04-2011, 02:18   #1
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Cleaning Engine Cooling System

I have a ford Lehman diesel 80hp 4 cylinder fresh water cooled via heat exchanger that has been sitting for a year. I was wondering the best way of cleaning the fresh water system through the engine without pulling the engine apart. Is there some type of cleaner available that will clean blockages etc sort of like draino.
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Old 12-04-2011, 12:02   #2
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Re: Cleaning engine cooling system

Sitting full of water, Dex or pink plumbing stuff? Run in salt or fresh water (might as well do the raw water side as well).

The short answer is "yes, a dilute solution of muriatic acid", but to what degree depends on whether the fresh water circuit was stored properly, how cold it got and so on. I assume in your part of Australia, frost isn't a problem?

While you're at it, examine the zincs for wear and check out our friend Maine Sail's photo essay on heat exchangers. Westerbeke / Universal Marine Heat Exchanger Photo Gallery by Compass Marine at pbase.com

It may help you to interpret what you may find.
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Old 12-04-2011, 19:00   #3
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Thanks for the reply.
Running in salt water (Newcastle). There is no zincs in the cooling system which I found strange especially being cast aluminium but the salt goes through the middle and doesn't touch the casting (in theory anyway that's what I have been told). It is full of fresh water and hasn't been drained. Frost is definitely not a problem :-).
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Old 19-04-2011, 11:49   #4
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Re: Cleaning Engine Cooling System

Here is another view - cleaning the heat exchanger and removing scale amoung other things ......

The Peregrine Sea: The Engine - A mystery solved and a cool solution
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