Josh: Very interesting to see your elbow corroded through on the sides. Did the raw water channel hold together ok? And, are you in salt water? It seems sensible to make the side castings thinner to fail first.
I know someone who had the welded steel one on a 2GM rust through and start spraying raw water back towards the head, which ultimately ruined it. Eric On Sun, Feb 17, 2019 at 1:24 AM Josh Muckley via CnC-List < cnc-list@cnc-list.com> wrote: > Yeah this was mine earlier this year. > > https://drive.google.com/folderview?id=1aC6-4V8P3BufZhZsusYFmMlmHknk-Ftv > > The rust blisters were still holding back a majority of the exhaust and > water. The entirety of the hole seen in the pictures occurred while I was > wrangling the hose off. I can't recall who manufactured my replacement but > it is SS, not polished, and available on ebay. > > Josh Muckley > S/V Sea Hawk > 1989 C&C 37+ > Solomons, MD > > > > > On Sun, Feb 17, 2019, 1:40 AM sender via CnC-List <cnc-list@cnc-list.com> > wrote: > >> I removed for inspection the exhaust mixing elbow on my Yanmar 3YM20. I >> was glad I did. It was heavily corroded on the inside and the iron was >> extensively deteriorated. The engine is 9 years old and runs in cold, salt >> water. >> >> We have a band saw at my work, when the blade is needs replacement, I >> will run it through to show how bad it is and post a pic. >> >> If a mixing elbow rots right through it can spill raw water back into the >> exhaust manifold and wreck the engine. >> >> I decided to try a 316 stainless aftermarket elbow mad by HDI marine, >> available on their website. I was a little hesitant, I usually spend the >> extra and go OEM, plus I've had a few disappointments with aftermarket >> parts online. >> >> I'm happy with the quality of the part, it's a close to exact match to >> the original Yanmar one, except the HDI doesn't have the oddly placed frost >> plug the Yanmar has (the frost plug is at the very top, which means the >> elbow would have to be nearly full of water when it freezes for it to >> pop...?). It's a nice casting, lots of weight and the interior of it >> looks very good quality. Too bad the did straight BSP instead of NPT >> threads on both the water inlet and exhaust outlet. The Groco "full flow' >> 1 1/4" pipe to 1 1/2" hose barb fitting isn't available in BSP. >> >> I assembled it with a good dose of nickel anti-seize for stainless, and >> will make it a point of disassembling it annually for inspection. >> >> Pictures: https://photos.app.goo.gl/RnNuMKzVZrFbjNKS7 >> >> Eric >> >> >> _______________________________________________ >> >> Thanks everyone for supporting this list with your contributions. Each >> and every one is greatly appreciated. If you want to support the list - >> use PayPal to send contribution -- https://www.paypal.me/stumurray >> >> _______________________________________________ > > Thanks everyone for supporting this list with your contributions. Each > and every one is greatly appreciated. If you want to support the list - > use PayPal to send contribution -- https://www.paypal.me/stumurray > >
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