Photos of my Yanmar 2qm20 riser - SailNet Community
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post #1 of 7 Old 01-05-2014 Thread Starter
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Photos of my Yanmar 2qm20 riser

Thought I'd post these photos. Thank you Forum.
After not being able to achive more that 2000 rpm and reading the forum I decided to check out the mixing elbow. Twice. The first time I just took and pulled the flange off the exhaust manifold and saw nothing but it keep bugging me so I pulled the riser off and took it to a friends house and took off the RW inlet, which I thought was o.k. because I could blow into it just fine! but when we got the flange and elbow off and I could see inside I was blown away at the two restrictions. There was about a 1/4 inch hole for both the RW and Exhaust to pass through. It appeared to me that the water was coming out of the wet exhaust just fine. As an aside a few months before when the heat jumped up I pulled off the Heat Exchanger I found it was plugged up with all sorts of things! How it could have ran with the HX and Mixing Elbow plugged is amazing.
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post #2 of 7 Old 01-06-2014
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Re: Photos of my Yanmar 2qm20 riser

I take it you went with a new one?

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Re: Photos of my Yanmar 2qm20 riser

Already had it in hand! After reading many posts in the forum and seeing an attached photo of a cutaway Riser I thought it might be prudent. The big surprise after seeing the corrosion was the left handed thread. I had talked to a P.O. who had put on the Campbell Sailer prop on and he said that he thought it might be over propped or pitched by a half inch so I did not think that was the problem. It came with a 2 micron Racon filter and that will be my next fix to go to a 10 micron if the RPM's still don't get to 2600 in gear.
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post #4 of 7 Old 01-10-2014
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Re: Photos of my Yanmar 2qm20 riser

is the riser the same on the 2qm15?

thanks for the info! much appreciated

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post #5 of 7 Old 01-10-2014 Thread Starter
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Re: Photos of my Yanmar 2qm20 riser

I would assume so but alas one should never assume. It would make sense though. Give these people a call and they will be able to help you: Google: Torresen Marine Supply. It's not an expensive part as far as parts go.
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post #6 of 7 Old 01-11-2014
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Re: Photos of my Yanmar 2qm20 riser

Replaced mine on my 3GM30F last spring. Looks identical. The coupling that connects the exhaust manifold to the exhaust elbow has RH threads on one end and LH on the other. Theoretically allows you to remove the elbow without rotating it, but that never works as the threads are usually frozen. I was able to reuse my coupling and "just" needed the elbow and manifold gasket.
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post #7 of 7 Old 01-11-2014
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Re: Photos of my Yanmar 2qm20 riser

The type of exhaust elbow on your 2QM15 engine will depend on the space available for best installation. Some installations use a 45 degree exhaust elbow similar to this:


Photos of my Yanmar 2qm20 riser-img_0938.jpg

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