Take a look at Maine Sail's photos of a HX that had not been serviced in a while: Westerbeke / Universal Marine Heat Exchanger Photo Gallery by Compass Marine at pbase.com
It is actually not such a bad job to disconnect and remove the HX for cleaning/servicing. I did it on a friends boat and it was not so bad nor was the HX obstructed with old zincs like the MS photos show.
How easy to do this depends on how easy it is to get to your HX as installed.
You will figure this out.
"The cure for anything is salt water~ sweat, tears, or the sea." ~Isak Denesen
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Last edited by CalebD; 12-01-2011 at 03:51 PM.