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Old 02-01-2009, 17:17   #1
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OIL CONSUMPTION

We have a YANMAR 3GM30. The enging runs perfect, looks perfect, is extremly clean, and probably has less than 400 hours on it. It starts when the button is pushed every time. The paint is still on the belts. We run it at @2600 - 2700 RPM which produces hull speed of 6 kts. It does not smoke, or leak.

I do not know how to measure the oil use except that it is using an amount which produces a 1/4 inch drop on the stick in thirty miles at the mentioned RPM, which is around 3/4 throttle. The sticks high and low marks have quite a spread.

We are using ROTELLA 15W40, as recomended.

Is some oil consumption normal? Our last boats Perkins 4-107, which was 25 years old used a little, but this engine is near new in use, but is probably six years old.

The previous owner, whom I know well says he seldom ran the engine, but changed oil yearly. I also met and spoke to the mech. who installed it, so I know the engine was new when installed.

Any ideas or suggestions will be appreciated.
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Old 02-01-2009, 17:45   #2
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It may very well be that the valves and rings have not yet seated.
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Old 02-01-2009, 17:49   #3
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Orion1, In order to quantify the rate of oil use you may wish to see how much oil is added to bring that 1/4 in. drop back to original level. I suspect you're talking about approximately eight ounces for those thirty miles. Maybe that's about five hours of cruising with the engine. That may be a little high. Do you have oil collecting in the engine sump? Do you have a lot of smoke in the effluent at the first starting & even some after the engine warms? Do you have a collection of soot on the transom after running for the five hours? The best thing to note is that an engine needs to have some oil use to be well lubricated. If that volume needed to replace the 1/4 in. drop is eight ounces or less and your not leaking oil, I would not think that you necessarily have a problem. 'take care and joy, Aythya crew
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Old 02-01-2009, 17:55   #4
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How long a wait after stopping the engine before you are checking the dipstick?
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Old 02-01-2009, 18:12   #5
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sounds high use for a Yanmar. That is the same sngine that I had in my Catamaran. One was replaced under warranty and the other cracked the lower skirt of the piston at 2500 hours. The engine witht he cracked piston ran good, but was a little hard starting and used a little oil.
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Old 02-01-2009, 18:15   #6
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couple questions!

Does this motor idle a lot while not underway?

What oil are you using?
..........................................._/)
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Old 02-01-2009, 18:18   #7
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Therapy, What an excellent question! That would be an easy cure.
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Old 02-01-2009, 18:20   #8
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Therapy, What an excellent question! That would be an easy cure.
Sometimes it's the little things that get overlooked.
And you are pretty sure how I learned it.
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Old 02-01-2009, 18:30   #9
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after 30 miles does it continue to drop or stabilize?
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Old 02-01-2009, 19:50   #10
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There is a small amount of soot on the transom

Oil is Rotella 15 / 40

Oil was checked the next morning

I do not know if it stops dropping but will check

A little smoke sometime on startup not much and mainly when cold weather
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Old 02-01-2009, 20:01   #11
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Capt. Force, the engine is run at least once a week, at the dock, under load only at well above idle RPM, for about one half hour, unless the boat is being used. It rarely idles without load.

Tell me about the sump collecting oil please. Not sure where to look.
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Old 03-01-2009, 06:19   #12
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If you check with Yanmar I am sure you will find that you should be using a monograde oil. Monograde oils are less likely to glaze the bores which sounds like a likely problem in this case due to low engine hours. Yes I know most owners use multigrade oils but that does not make it right. Secondly check that the engine is running at correct temperature not too cold due to faulty thermostat. Thirdly you mentioned running the motor under load at the marina, how much load? Possibly not enough which will also add to the bore glaze resulting in high oil consumption. With correct oil and running at recommended temperature under load it will take many hours before you see an improvement.
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Old 03-01-2009, 06:53   #13
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If you check with Yanmar I am sure you will find that you should be using a monograde oil. Monograde oils are less likely to glaze the bores which sounds like a likely problem in this case due to low engine hours. Yes I know most owners use multigrade oils but that does not make it right. Secondly check that the engine is running at correct temperature not too cold due to faulty thermostat. Thirdly you mentioned running the motor under load at the marina, how much load? Possibly not enough which will also add to the bore glaze resulting in high oil consumption. With correct oil and running at recommended temperature under load it will take many hours before you see an improvement.
Yanmar does state 15w40 as acceptable.

I'm focusing on drain back delay as Therapy eluded to. Or that engine for some reason likes to be a little "low" on oil.

Another question.
The rubber stopper on the GM dipstick can move from it's original place on the dip stick. Has yours?
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Old 03-01-2009, 08:17   #14
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I may try a 30 weight oil, which I ran in my Perkins for years. This climate is on the warmer side most of the year.

When the engine is run under load, at the dock, it is run @ 2000 RPM. This is a real problem as it needs to be run, and can't always be taken out. I try to run it once a week if it is not being used. What RPM should it be run at?

I checked the rubber stopper on the dipstick and it seems to be in the proper location.
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Old 03-01-2009, 08:36   #15
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at the dock in gear at 2000 is a great workout
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