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Oil Consuption Yanmar 3JH4E

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Lippe View Drop Down
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Joined: 05 September 2009
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Lippe Quote  Post ReplyReply Direct Link To This Post Posted: 12 August 2017 at 16:46
Hi. There is no engine that would not consume any oil. If you cannot measure any consumption, you need to worry about why. Maybe oil or water finds it's way to replace the oil. You cannot compare sloc to a 780 kw MTU which is a completely different engine. Dont worry if your consumption is within or below factory informed level and if you dont have other issues like exessive smoke, smell etc.

Edited by Lippe - 12 August 2017 at 16:48
"True sailor doesn't ask for proper wind. He learns how to sail"
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Wayne's World View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Wayne's World Quote  Post ReplyReply Direct Link To This Post Posted: 12 August 2017 at 19:52
Lippe, 

Of course a 8V2000 MTU is a different engine to Michael's Yanmar. A Volvo D3 is however similar to Michael's Yanmar and our genset drive motor which is a two cylinder Kubota is a very basic engine - but in all cases they do not use oil. The oil from the Volvo and the Kubota are completely different at oil changes - the Volvo's oil is still honey colored with minor contamination whilst the Kubota is black with in about 10 hours of an oil change. But they still do not use oil. 

When checking oil levels one needs to also check the color, feel and smell of the oil - if it is milky you probably have water contamination, if the oil is gritty you have a combustion or lugging problem, if it is thin and smells of diesel then you have contamination by fuel. If the oil is the right level and does not show the above signs then the engine is not using oil. Again if the engine is being normally run at lower RPM, as most of us do, then oil consumption should be less than the "acceptable" levels quoted by Yanmar. If the oil is low then is is either being burnt or leaking. 

If an engine with only 500 hours starts using a lot of oil all of a sudden there is a problem. Keep in mind the "acceptable" oil consumption by Yanmar is at a high power - not like most of us run our motors. At higher powers engines use much more fuel and potentially more oil.

There are other posts on other forums discussing excessive oil consumption by Yanmar engines and the same comments come from Yanmar but often the issue ends up being damaged oil rings which causes burning of the oil without noticeable, excessive black smoke. 

If Michael is happy to put up with the oil consumption on his Yanamr then that is up to him. But he asked is this amount of oil consumption normal for a engine with low hours- IMHO it is not normal and it is excessive. Obviously Yanmar have a different opinion - funny about.  
Wayne W
Cruising, currently in the Mediterranean.
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bovine View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote bovine Quote  Post ReplyReply Direct Link To This Post Posted: 13 August 2017 at 23:58
Is the right grade oil being used, if a high grade oil has been used in the past possible bores are polished
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