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


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Old 04-07-2013
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Yanmar 2QM15: How can I keep it running forever?

My new-to-me 1981 Spirit 28 has a 2QM15 (raw water cooled). Not sure how many hours are on it, since the boat didn't come with an hour meter (PO installed one, about 80 hours currently). Based on boat history (lots of hard storage and marina time), my guess is that the engine has less than 1,500 hours. Visually, it looks virtually new (no rust or visible corrosion anywhere), and it runs very well (although it's a bit hard starting when cold, which seems to be normal for these non-glow plug motors).

Given the high cost of repowering, and its apparent good condition, I'd like to keep this motor running for as long as possible. Based on my internet research, the most common failure modes seem to be corrosion based (exhaust manifold (part not readily available) and mixing elbow), along with head gasket leaks (perhaps also related to corrosion).

A fresh water cooling conversion would appear to reduce the rate of corrosion, but it doesn't appear that conversion kits are offered any longer, so I'd need to engineer my own (not sure the payback would be worth the cost and hassle).

Other than standard routine maintenance, a periodic chemical flush (Rydlyme) appears to be recommended by many. One person suggested an electric pre-oiler (though excessive wear doesn't seem to be a primary failure mode on these engines).

Any other recommendations?

Last edited by Rusty123; 04-07-2013 at 03:44 PM.
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Old 04-07-2013
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Re: Yanmar 2QM15: How can I keep it running forever?

the Yanmars only weakness is the exhaust elbow. Change the oil/check it regularly, keep the fuel clean and you could have many trouble free years.
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Old 04-07-2013
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Re: Yanmar 2QM15: How can I keep it running forever?

Seakamp Engineering (Bellingham), or AAA Marine in Tacoma can supply nice little heat exchangers that might be worth looking into, but it is a pricey project. You would preserve the current condition of any loss of metals due to corrosion with RWC in play.

Absent the desire or motivation to convert, be sure to keep zincs in good shape (which has hopefully been done up til now)
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Old 04-07-2013
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Re: Yanmar 2QM15: How can I keep it running forever?

If you aren't going to use her in the winter you can winterize the engine with antifreeze solution to stop corrosion during the layup period.

Noticed you sail out of Brownsville WA so you probably won't winterize but will be going out all year except for those clear cold days in January when it is 20 degrees and blowing 30 knots. The days following those days will likely show a little drizzle and 50 degrees... underway days.
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Re: Yanmar 2QM15: How can I keep it running forever?

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Originally Posted by fryewe View Post
Noticed you sail out of Brownsville WA so you probably won't winterize but will be going out all year except for those clear cold days in January when it is 20 degrees and blowing 30 knots. The days following those days will likely show a little drizzle and 50 degrees... underway days.
Correct -- sailed her off and on throughout the winter. Better for the engine to get some occasional use, I'm told. (Kind of like us, eh?).
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Re: Yanmar 2QM15: How can I keep it running forever?

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Originally Posted by jsaronson View Post
the Yanmars only weakness is the exhaust elbow. Change the oil/check it regularly, keep the fuel clean and you could have many trouble free years.
What's the best strategy to deal with the elbow?
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Re: Yanmar 2QM15: How can I keep it running forever?

The elbow isn't the real problem as far as longevity of your engine...the real problem will likely be the exhaust manifold. You can buy a new elbow and it won't cost you an arm and a leg. Mine cost about a hundred bucks...if I remember correctly...when I bought it about five years ago.

The exhaust manifold on the other hand is a weak link due to hard scale fouling and relatively thin walls that are subject to corrosion and it has a pretty significant thermal stress due to the temperature difference between the exhaust and cooling. And you can't buy one. If yours fails internally you either have to scavenge one off an old engine if you can find one or have one built. I seem to remember reading about someone having one built a few years ago but I don't remember the details. Would certainly be more expensive than replacing the exhaust elbow.

Another problem area for you if you have the 45 degree elbow rather than the U-shaped elbow may be the transition piece that the elbow screws into on the aft end of the manifold. When my elbow rusted out I was unable to get the elbow out of the transition piece and I had to replace that piece as well. I don't think it is available anymore.
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Old 04-08-2013
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Re: Yanmar 2QM15: How can I keep it running forever?

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Originally Posted by fryewe View Post
The exhaust manifold on the other hand is a weak link due to hard scale fouling and relatively thin walls that are subject to corrosion ...
My understanding is that periodic flushing with Rydlyme or equivalent will get rid of the scaling, but short of converting to FWC (and replacing the zincs on time), is there anything I can do to keep the corrosion at bay?
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Old 04-09-2013
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Re: Yanmar 2QM15: How can I keep it running forever?

Rusty, I've got the 2qm20, 35yrs old.

i just took the exhaust manifold down to my local machine shop. They tanked it, cleaned it up and it was fine. A few over priced gaskets and 30mins later I was back in business.

There was no unusual corrosion in the manifold, but it was pretty clogged up with carbon.

I didn't realize that the exhaust manifold an elbow were unavailable. That sucks. We may have to settle for having them last *our* lifetime instead of forever :-)
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Old 04-09-2013
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Re: Yanmar 2QM15: How can I keep it running forever?

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Originally Posted by bristol299bob View Post
Rusty, I've got the 2qm20, 35yrs old.

i just took the exhaust manifold down to my local machine shop. They tanked it, cleaned it up and it was fine. A few over priced gaskets and 30mins later I was back in business.

There was no unusual corrosion in the manifold, but it was pretty clogged up with carbon.

I didn't realize that the exhaust manifold an elbow were unavailable. That sucks. We may have to settle for having them last *our* lifetime instead of forever :-)
What do you mean by "tanked" it?
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