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Diesel This is a new forum dedicated to diesel engines and their applicable accessories.

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  • 1 Post By Dave Montgomery
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Old 09-29-2013
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Smile Homemade exhaust riser outcome....

Well the new exhaust riser is done and installed. Hopefully the pics. show up in this thread. This turned out to be a great solution to buying the original from Yanmar. I believe that it will be much cheaper in the end and easier to repair. I also believe that this DIY system will allow more exhaust out possibly making the engine more efficient. When the riser system does need to be worked on due to corrosion problems it should only involve the several small pipe parts that actually have contact with the salt water. The rest of the housing should be little effected. The amount of raw cooling water and exhaust getting through the engine seems to be much much better than before (of course the original mixing elbow was clogged pretty good). Engine seemed to rev quicker and the exhaust piping is much cooler feeling. If you have questions or concerns please pile on here.
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Old 09-29-2013
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Re: Homemade exhaust riser outcome....

did you use galvanized pipe to make your exhaust riser or black pipe?
Galvanized is supposed to give off odors in early use.
A heat protective wrap around some of that pipe in the hot section is often used.
Moyer Marine carries an exhaust wrap that would work (not asbestos).

I thought the cooling water entrance point was supposed to be lower than the top of the column?
Otherwise it looks quite solid.
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Old 09-29-2013
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Re: Homemade exhaust riser outcome....


I used black pipe for this system. The silver is high temp paint.

A heat protecting wrap could be used though I am not sure it would be any more needed than on the Yanmar edition which has no wrap. What are you thinking?

Good point on the water inlet. What you cannot see is that where the water comes in at the top, I welded about a 3 1/2 long 1/2 inch black pipe pointing down into the exhaust tube so the water actually does not enter until it gets beyond where the exhaust comes in.

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Old 09-30-2013
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Re: Homemade exhaust riser outcome....

What a great job I love all the diy stuff.
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