Exhaust Mixing Elbow

[NYSail]

In my work, I have removed the mixing elbor. Upon inspection, the water intake port was 50% blocked with gook. Also, the front of the elbow was paper thin on the exhaust side of the loop and broke through with a strong push of the finger.....That is why Yanmar suggests changing every 5-years I guess....not 20 as in my case. I have some pictures I will post later.GregP36-2 #101

 

[patrick]

My Home Depot model

is still going strong in its second year.

 

[David W]

Patrick, can you elaborate?

on your "Home Depot model"?David

 

[patrick]

It is in the archives

basically iron pipe fittings with a double tapped bushing to provide a water injection point.

 

[patrick]

David, here it is from before

It is made of 1 1/2 inch black pipe fittings. Street ell goes into the manifold. Close nipple into that. Tee (middle hole) onto that. 6 inch nipple goes onto the bottom of the tee and that connects to the exhaust hose. Top hole of the tee is where you put a 1 1/2 inch to 1/2 inch double tapped bushing. Ask a plumbing supply store for that. Home depot won't have it. Adapt the top side of that bushing to the water hose which used to go to the old elbow. On the inside (lower side) of the bushing, you will need to attach a 6 inch X 1/2 inch nipple. Before you install that nipple, make a dozen small holes (1/8 inch or so) around the lower half of that nipple. Make sure the holes are below the middle opening of the tee. These holes are where the cooling water gets squirted into the exhaust gas. You do not want cooling water going back into the manifold. You also need to cap (or tap and plug) the lower end of that pipe.Parts cost about $20.Seal everything with high temp antiseize compound. Do not use teflon tape for this application. It makes a toxic gas which can be lethal as I am told. Do not over tighten anything and it will come apart much easier later.I got two of everything when I made mine so I will have a replacement for anything that fails. It is still ok after two years and I check it when I change oil.I wrapped some fiberglass tape around mine just so that I could not accidentally touch the hot parts of this thing. It gets much hotter than the stock part so it may produce more heat in your engine compartment too.