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Old 12-19-2015, 11:42 AM   #17
caltexflanc's Avatar
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No special hi-temp resins required as the raw-water/exhaust mix that passes through this fitting is no hotter than bath water
I'd invite you to stick a temp probe in there sometime, since sticking your hand in there isn't possible. Now true, the place where it is leaking is "water cooled" ... water that has been through various heat exchangers and is now in contact with exhaust gasses. But you will want to thoroughly seal the area around the crack as well. Not having seen the suspect crack, I don't know how big the crack is or what its root causes may be (an important point raised by other posters). I certainly would want a professional opinion, rather than merely rely on us internet cowboys with no first hand view of or vested interest in the problem or the outcome of the fix.

"There's the Right Way, the Wrong Way, and what some guy says he's gotten away with"
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