I reuse my old gasket every time I take the exchanger apart which is at least once a year to change the zinc and more often if I experience over heating. I've had the boat 12 years of it's 25 years. I think this proves the rubber gasket and O-ring are reusable.
The bolts require a 9/16" wrench and no teflon tape or pipe dope since it's all rubber. You tighten the bolts gently, very little torgue. The temperature of the water is limited to 195 degrees and pressure is probably under 25# based purely on experience working with my engine. Chuck Resolute 1990 C&C 34R Broad Creek, Magothy River, Md ----- Original Message ----- From: "David Knecht via CnC-List" <[email protected]> To: "Jake Brodersen" <[email protected]>, "CnC CnC discussion list" <[email protected]> Cc: "David Knecht" <[email protected]> Sent: Tuesday, May 19, 2015 7:29:08 AM Subject: Re: Stus-List Heat exchanger problem I used a new gasket and o-Ring from Toad. Marine. I did have a new thought about the problem overnight. For some reason that I can no longer remember, I put teflon tape on the threads of the end cap bolts. Was that a mistake and the teflon tape is keeping the bolts from tightening? Dave On May 19, 2015, at 6:26 AM, Jake Brodersen < [email protected] > wrote: Dave, Is the gasket new? I doubt that a used gasket would seal in this situation. It has been crushed under heat and pressure. It probably has taken a set that keeps it from sealing properly. Jake Jake Brodersen “Midnight Mistress” C&C 35 Mk-III Hampton VA From: CnC-List [ mailto:[email protected] ] On Behalf Of David Knecht via CnC-List Sent: Monday, May 18, 2015 10:06 PM To: CnC CnC discussion list Cc: David Knecht Subject: Stus-List Heat exchanger problem I hope someone can help with this problem. I removed my heat exchanger from my Universal M4-30 last winter and had it cleaned out and a radiator shop and then I repainted it. As far as I can tell, the guy who did it did not pressure test it because it came back disassembled. I did not think much of it at the time. When I reassembled the end plates, it did not feel like the end caps were secured against the housing, but I assumed the gasket would do its job since I tightened the bolts as much as possible. Aries splashed today and when I started up the engine, water was spraying out of the end cap on one side an dripping from the other. The bolt is as tight as I can get it, but it still seems to not be putting enough pressure on the caps to seal. I was a bit confused about the assembly process. The order I thought was correct was the plate with the O ring on the bolt and the gasket over that. The plate has a slight recess that I thought was for the O ring, but it seems like the O ring might be preventing the plate from making good contact with the gasket. The way I assembled it looks like the picture on the Pbase site which is the only photo I can find ( http://www.pbase.com/mainecruising/heat_exchanger ). Any words of wisdom out there? Thanks- Dave Aries 1990 C&C 34+ New London, CT <image001.png> Aries 1990 C&C 34+ New London, CT _______________________________________________ Email address: [email protected] 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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