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Old 28-06-2012, 21:02   #1
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Diesel Drinking Oil ?

One of the diesel's on our lagoon 470 (Yanmar 4JH3E - YUE), has started drinking oil. 0.5 L plus every 10 ours. However it is intermittent:

There is no oil leak (bilge bone dry)
No sign of black smoke either under load or in neutral at 1800rpm
No oil in exhaust either under load or in neutral at 1800rpm (after 10 min warm-up).

It seems to use more if it has been run without load at 1800 rpm to charge the engines, but not fully confirmed yet.

Any ideas?

Thanks

Tony
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Old 29-06-2012, 05:40   #2
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Have you checked your ccv (constant crankcase vent) valve or your air filter. If either of these are not up to par oil consumption can be affected. This is often mistaken for a piston ring problem. Courtesy of Captain Mick Sparrow
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Old 29-06-2012, 05:48   #3
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Re: Diesel Drinking Oil?

Thanks Mick,

I'll check that out. Is there an easy way to check if the CCV is working?

Tony
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Old 29-06-2012, 05:51   #4
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Take it out, clean it in petrol, rinse, then give it a suck and blow, it should only work one way ie venting positive pressure from the crankcase
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Old 30-06-2012, 11:50   #5
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Re: Diesel Drinking Oil?

Dumb question.

Where is the CCV valve? I couldn't find it in the manual.


Tony
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Old 30-06-2012, 22:18   #6
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Hi Tony. On second thoughts, you are probably better off leaving the ccv for a pro. They are infinitely reliable anyway and simply concentrate on ensuring the air filter isn't restricted in any way. If it is restricted, the vacuum from the intake will suck a small amount of oil from inside the engine. If your air filter is good then I would seek proffessional advice. You would definitely notice an oil leak of that volume so it is most likely an internal problem. BTW, does the engine have high hours on it? Regards, Mick.
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Old 01-07-2012, 06:05   #7
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Re: Diesel Drinking Oil ?

Hi Mick,

Engine has ~3000hrs. I think I have established that running at 1800rpm no load, drinks 1/2L in 10 hours. running only under load no oil consumption.

No idea where it goes.

Tony
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Old 01-07-2012, 07:59   #8
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Hi Tony.
Given that amount of hours you are probably going to have to accept some oil consumption. But make sure your air filter is in good condition anyway.
Good luck
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Old 01-07-2012, 08:11   #9
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Re: Diesel Drinking Oil ?

I am no mechanic, but how many of those 3000 hours have been battery charging and how many have been over 1800? Folks say battery charging is a bad use for a diesel. In the same train of thought, have you been battery charging with your other diesel?The one that is not burning oil?
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Old 01-07-2012, 08:57   #10
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Re: Diesel Drinking Oil ?

No idea, we haven't had the boat that long. We alternate between engines for charging. Port engine doesn't consume oil, but it had major work done before we bought the boat.

Tony
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Old 01-07-2012, 20:51   #11
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Sounds like your starboard engine needs a similar overhaul mate.

Mick
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Old 01-07-2012, 21:02   #12
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Re: Diesel Drinking Oil ?

Quote:
Originally Posted by Tday01 View Post
No sign of black smoke either under load or in neutral at 1800rpm

Just a side note, usually if you're burning oil the smoke is going to be a blue or whitish blue color. Not the black of an overloaded engine.

That oil has to be going somewhere if you're losing that much of it!

Hope you get it worked out Tony! Let us know what you find out.
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Old 01-07-2012, 22:44   #13
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Re: Diesel Drinking Oil ?

oh , that oil is burning.
Is it getting past the rings?
my guess , yes.
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Old 01-07-2012, 23:33   #14
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Re: Diesel Drinking Oil ?

had new engines installed one used oil.
spoke with engine builders. they suggested running at full
throttle for 10-30 mins
I tried this & it solved my problem
( underway)
diesels like to work hard, running under no load
( charging batteries)
can cause the bores to become glazed.
running at full throttle can remove this gaze
& reseat the rings
Buy a small generator ( honda) & use it to
charge your batteries, it is far cheaper in the
long run
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Old 02-07-2012, 06:53   #15
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Re: Diesel Drinking Oil ?

The odd thing is I don't see the oil burning and most of the time their is no consumption. Then it consumes lots at some point (presumably while sailing as I don't see the smoke).
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