My heat exchanger on a Universal M4-30 has caps on the ends. I remove the single 9/16" cap screw on each end cap and remove them exposing the tubes. The raw water is what leaks out. The antifreeze is inside the shell, and it doesn't leak out. I rod out the tubes using small 1/8" wooden dowels I get from hobby stores like Michaels or even WalMart. I'd love to find pipe cleaners but haven't found them long enough. My heat exchanger is about 13" long so I buy the 3' long dowels and break em in half, and keep em in my spare engine parts container onboard. I do this once a season and for twelve years it seems to work well, reusing the OEM rubber gasket on each end. My heat exchanger has a pencil zinc that needs to be changed each spring.
The inside of the shell can be acid cleaned to improve heat transfer. Chuck Resolute 1990 C&C 34R Broad Creek, Magothy River, Md ----- Original Message ----- From: "Josh Muckley via CnC-List" <cnc-list@cnc-list.com> To: "C&C List" <cnc-list@cnc-list.com> Cc: "Josh Muckley" <muckl...@gmail.com> Sent: Sunday, May 10, 2015 10:16:01 PM Subject: Re: Stus-List Heat exchanger First, I would try to suck/siphon enough coolant out and save it for reuse. Second, without the end bells on the core is removable. In fact in dire straights you can do so to make your fresh water cooled into a raw water cooled. That being said, I don't think you can remove the end bells without causing coolant to leak. Josh Muckley S/V Sea Hawk 1989 C&C 37+ Solomons, MD As I progress through my cooling system I will have to clean out the heat exchanger on our 3HM35. I have a simple question, not covered in the repair manual I have... Can it be cleaned in place once the end caps are removed? And, if so, does this mean I don't have the drain the coolant? thx Tom Buscaglia S/V Alera 1990 C&C 37+/40 Vashon WA P 206.463.9200 _______________________________________________ Email address: CnC-List@cnc-list.com To change your list preferences, including unsubscribing -- go to the bottom of page at: http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com _______________________________________________ Email address: CnC-List@cnc-list.com To change your list preferences, including unsubscribing -- go to the bottom of page at: http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com
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