Exhaust Elbow corroded and leaking

timmygobang

timmygobang

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I hope I'm using the right terminology when I call this pipe the exhaust elbow.

I noticed where the arrow is pointing there is a fine spray of water coming out, not from the flexible piping but from the metal pipe where it joins the main pipe from the engine. It has a lot of crud on it so I guess its just badly corroded.

This part looks pretty custom, and I guess there's no quick permanent safe fix other than replacing it?

I'm in London at the moment, is there anywhere around here (perhaps Chatham) that could manufacture a new one? or is this a South Coast jobby?

Any help or advice would be great.

exhaust-pipe.jpg
 
timmygobang said:
I hope I'm using the right terminology when I call this pipe the exhaust elbow.

I noticed where the arrow is pointing there is a fine spray of water coming out, not from the flexible piping but from the metal pipe where it joins the main pipe from the engine. It has a lot of crud on it so I guess its just badly corroded.

This part looks pretty custom, and I guess there's no quick permanent safe fix other than replacing it?

I'm in London at the moment, is there anywhere around here (perhaps Chatham) that could manufacture a new one? or is this a South Coast jobby?

Any help or advice would be great.

exhaust-pipe.jpg
Click to expand...

The best thing that was suggested to me was (from memory) called Balzell 111 - heat resistant plastic metal that can be used on engine blocks! Stuffs great. In the case of the exhaust elbow it did no good at all, once off you could see how bad it actually was - new part. In hindsight I wish I had looked for a custom stainless fabricator, but then again in hindsight.....
 
You don't say what engine you have, which will obviously make a difference if a distributor can sell you the part off the shelf. It looks like a marinised automotive engine, as the mixing chamber is welded onto an existing exhaust stub. It's likely that the heat and salt water have eaten through the wall of the exhaust, probably attacking the weld fastest as it usually does, so a patch on the outside would only effect a very temporary repair though that could be useful whilst a new one is being fabricated.

I haven't tried it myself, but others have said that a few coats of epoxy resin on the inside before fitting will extend the life of a new fitting. Older fishing boats often had black steel fittings in their exhausts and these were boiled in oil to carburise the surface which also slowed the corrosion down.

Let us know what the engine is and someone will know where to get a replacement.

Rob.
 
timmygobang said:
I hope I'm using the right terminology when I call this pipe the exhaust elbow.

I noticed where the arrow is pointing there is a fine spray of water coming out, not from the flexible piping but from the metal pipe where it joins the main pipe from the engine. It has a lot of crud on it so I guess its just badly corroded.

This part looks pretty custom, and I guess there's no quick permanent safe fix other than replacing it?

I'm in London at the moment, is there anywhere around here (perhaps Chatham) that could manufacture a new one? or is this a South Coast jobby?

Any help or advice would be great.
Click to expand...
I would suggest that you take the exhaust elbow off and inspect the inside before you contemplate to repair the leak.

Depending on how this is put together you might find corrosion inside that also needs fixing/replacement off the elbow.

Some designs will let water go into the cylinders when corrosion have removed enough metal inside...

You might be able to find a off the shelf exhaust elbow that fit your engine/boat.
 
I know this is a common problem. Have you looked at previous threads?

Exhaust Elbow corroded and leaking - Yachting and Boating World
www.ybw.com › ... › Forum › Practical Boat Owner's Reader to Reader‎
4 hours ago - 2 posts - ‎2 authors
I hope I'm using the right terminology when I call this pipe the exhaust elbow. I noticed where the arrow is pointing there is a fine spray of water ...
Exhaust elbow any way to prevent corrosion? 10 posts 1 Feb 2014
Cracked exhaust elbow Yanmar YSB8 - Yachting and ... 3 posts 14 Mar 2009
DIY exhaust elbow - which metal? - Yachting and ... 10 posts 26 Oct 2008
Exhaust port / mixing elbow. - Yachting and Boat 10 posts 20 Jan 2006
 
Thanks for the replies.

The engine is a Volvo D1-20.

I thought it might have been a custom job as the exhaust has what looks like a piece welded onto it so that a strut can be screwed into the exhaust. The strut I'm guessing stops the exhaust from vibrating too much.
 
Try Lancing Marine, Sussex. We had a similar problem, bandaged it but eventually had to have one made in stainless steel. Lovely job and should last a lot longer. It wasn't that much more in price.
 
timmygobang said:
Thanks for the replies.

The engine is a Volvo D1-20.

I thought it might have been a custom job as the exhaust has what looks like a piece welded onto it so that a strut can be screwed into the exhaust. The strut I'm guessing stops the exhaust from vibrating too much.
Click to expand...
That looks very non standard for a D1-20 and may be a DIY attempt at getting a high rise manifold. suggest you consider fitting a proper Volvo high rise manifold.
 
I replaced the exhaust elbow on my Yanmar for around £120 for the part. The inside of the old was so blocked up with sh!te that i couldnt get engine revs above 1800 rpm. I know your component isnt an exhaust elbow, but i guess its a similar cost. If you cant source a piece, pm me and i will dig out the name and number of an engineering shop near Portsmouth who made up some bespoke components for me.

If the repair is worth doing, then I would recommend JB weld, a cold weld solution.

http://www.ebay.co.uk/itm/like/2508...ff11=ICEP3.0.0&ff12=67&ff13=80&ff14=95&ff19=0
 
It is an exhaust elbow, but there are two types, one where the exhaust goes higher for use if the engine is installed below the waterline and the "low" standard one. Looks like whoever installed your engine removed the standard elbow and made up their own high rise. Bit difficult to see exactly what they have done as your photo does not show enough of the main exhaust on the engine. Have a look at the brochure for the engine to see what a standard layout looks like.
 
I agree it is an exhaust riser possibly custom built the standard elbow exits the heat exchanger and angles immediately downward you can view the standard elbow on Keyparts website. You will have to locate the four studs that fix it to the heat exchanger , the good news is that it was probably fabricated and welded so repair should not be too difficult , another alternative is to buy a standard elbow £175 and have a flange made up between the top of your riser and the new elbow this is something I did after making a riser out of iron steam pipe.
 
Thanks very much, I'll compare what I have to the standard part. I don't fancy the job of trying to remove it from the heat exchanger, I may have to take contortionist lessons!

I would rather replace the pipe outright and sleep easy than repair it, though that jb-weld would be a good solution for now. I'm intending on heading down to the south coast over the summer so maybe the jb-weld would be suffice for now. Thanks peter I will pm you if I go for a custom job for those details.
 
timmygobang said:
Thanks very much, I'll compare what I have to the standard part. I don't fancy the job of trying to remove it from the heat exchanger, I may have to take contortionist lessons!

I would rather replace the pipe outright and sleep easy than repair it, though that jb-weld would be a good solution for now. I'm intending on heading down to the south coast over the summer so maybe the jb-weld would be suffice for now. Thanks peter I will pm you if I go for a custom job for those details.
Click to expand...

You could also try ASAP-Supplies. They do a lot of stuff for making up exhaust elbows.

Yoda
 
peter2407 said:
I replaced the exhaust elbow on my Yanmar for around £120 for the part. The inside of the old was so blocked up with sh!te that i couldnt get engine revs above 1800 rpm. I know your component isnt an exhaust elbow, but i guess its a similar cost. If you cant source a piece, pm me and i will dig out the name and number of an engineering shop near Portsmouth who made up some bespoke components for me.

If the repair is worth doing, then I would recommend JB weld, a cold weld solution.

http://www.ebay.co.uk/itm/like/2508...ff11=ICEP3.0.0&ff12=67&ff13=80&ff14=95&ff19=0
Click to expand...

Should be checked every two years on a Yanmar otherwise it's an engine re-build. I was quoted the same crazy price so after research on here bought a good grade Stainless Steel one from America for £65. I don't have the guys name but someone on here will know, he is quite well known and does other engine makes. Think it was Bill or Ben but not a flower pot man!
 
My exhaust elbow went on my Buhk 24 recently.

Bought a new one from Ebay for about £100. It was stainless steel.

It was easy to take off the old one, and put on the new.

I wait to see about the quality, but so far so good.

MJ
 
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