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Go Back   SailNet Community > On Board > Gear & Maintenance > Engines > Diesel > Yanmar 2QM15: How can I keep it running forever?
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Thread: Yanmar 2QM15: How can I keep it running forever? Reply to Thread
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Topic Review (Newest First)
05-13-2013 08:57 PM
bristol299bob
Re: Yanmar 2QM15: How can I keep it running forever?

I'd say it depends on the transmission that's bolted on to that 2qm15. If you have the Kanzaki/Hurth transmission then you should use ATF. My 2qm20 came original with a kanzaki-hurth KBW10 and I believe your 2qm15 came with one as well.



Of course you may have an after market tranny installed. Most folks seem to go with TwinDisc models when the old KBW10 gives up the ghost. They are a bolt on replacement ... they don't use ATF.

Bottom line is to check the plate on your transmission.
05-13-2013 07:50 PM
casey1999
Re: Yanmar 2QM15: How can I keep it running forever?

Quote:
Originally Posted by weephee View Post
I have a 2QM15 which I'm going to replace my A4 with. I had no engine history so I had the head rebuilt and some other work done. My manual says to use ATF in the clutch housing which I have done. I've started the engine on a skid but not in the boat yet. Should I replace the ATF with SAE30. I put diesel SAE 30 in the crank case.
Thanks
Do not run until you check the name plate on the transmission.

The Yanmar manuals give the wrong transmission oil in many cases as the engine may be mated to a different transmission. Triple check before running.
05-13-2013 07:44 PM
Faster
Re: Yanmar 2QM15: How can I keep it running forever?

Whether to use ATF or 30wt oil will depend on the actual tranny mated to your engine. As mentioned above find out what tranny you've got.. read the nameplate; it should specify.
05-13-2013 07:36 PM
weephee
Re: Yanmar 2QM15: How can I keep it running forever?

I have a 2QM15 which I'm going to replace my A4 with. I had no engine history so I had the head rebuilt and some other work done. My manual says to use ATF in the clutch housing which I have done. I've started the engine on a skid but not in the boat yet. Should I replace the ATF with SAE30. I put diesel SAE 30 in the crank case.
Thanks
04-15-2013 02:33 PM
casey1999
Re: Yanmar 2QM15: How can I keep it running forever?

Quote:
Originally Posted by Rusty123 View Post
The discussions on this thread, as well as some other research I've performed, has convinced me that a fresh water conversion wouldn't be worth the effort.

Casey: thanks for the detailed reports on your research. My gut confirms your position that the head shouldn't be removed just to perform routine maintenance. I'm still stumped why the manual calls for that. When you spoke to the Torreson mechanic (or anyone else), did he even acknowledge that the manual has that requirement?

Hugo: that's good gouge. I've seen most of this in other locations, but not consolidated like your post. How often do you do the Rydlyme flush?
The mechanic just said they do not routinely do a valve lapping. I did not question him why the manual would call for it. I have seen mistakes in the yanmar manuals concerning things like the wiring diagrams but most importantly, mistakes in the transmission oils that are called for. Sometimes the Yanmar manula will say ATF when you really need a SAE 30. Best to check the name plate of the transmission for oil type. Also, Yanmar states transmission should be left in neutral when engine off and sailing.
04-13-2013 01:24 PM
TQA
Re: Yanmar 2QM15: How can I keep it running forever?

Quote:
Originally Posted by Rusty123 View Post
On a related topic, I notice that the service manual calls for a valve lapping every 1,000 hours. ?
Nooooooooooooooooooooooooooooooooooooooooooooooooo oooooooo

Don't do it.

Maybe just maybe it might need it at around 8000hrs.

Wait until your valve to valve seat seal is starting to leak then redo it. It will be a gradual process so the engine will get a little harder to start as the compression escapes.
04-13-2013 12:32 PM
aa3jy
Re: Yanmar 2QM15: How can I keep it running forever?

As Capt. Ron once said "... Diesels love their oil like sailors love their rum.." Check and change often.
04-13-2013 12:48 AM
HUGOSALT
Re: Yanmar 2QM15: How can I keep it running forever?

Flush with Rydlyme every few years, try to time with changing
internal engine zincs (remove before flushing or change after)...and always change/remove impeller when using Rydlyme.
or can flush if engine running hot or if raw water flow decreases.
04-12-2013 03:58 PM
Rusty123
Re: Yanmar 2QM15: How can I keep it running forever?

The discussions on this thread, as well as some other research I've performed, has convinced me that a fresh water conversion wouldn't be worth the effort.

Casey: thanks for the detailed reports on your research. My gut confirms your position that the head shouldn't be removed just to perform routine maintenance. I'm still stumped why the manual calls for that. When you spoke to the Torreson mechanic (or anyone else), did he even acknowledge that the manual has that requirement?

Hugo: that's good gouge. I've seen most of this in other locations, but not consolidated like your post. How often do you do the Rydlyme flush?
04-12-2013 12:54 AM
HUGOSALT
Re: Yanmar 2QM15: How can I keep it running forever?

Owner of 3 GMC (raw water) for 28 years,
Cold starting: Yanmar recommends lots of throttle, as much as 3/4
then upon starting throttle down.
Rydyme flush: follow directions...upon completion must neutralize
Rydlyme with baking soda...then harden off to "good rust" by
running motor approx. 1 hour.
Excellent instructions in post by Mainesail re rydlyme flush.
Changing internal engine zincs: check every year, my experience
have not had to change every year as boat lives on fairly isolated
mooring.
Shutting down motor at end of dayhave followed since new,
recommended by Yanmar/Mack Boring...idle motor short while to cool...then run at very hi RPM's immediately before shutting down.
By following above I am still with original mixing elbow,
check it every year or so with none/minor carbon buildup.
One last point, was told years ago and follow...don't baby motor
run her hard under load. Mid range RPM's with no load will wear
more than running at max. RPM (80-85% max. rpm's)
Am quite sure that I'll be long gone and this raw water motor
will still be in service if looked after and not babied!
Hope this helps,
Hugo
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