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Go Back   SailNet Community > On Board > Gear & Maintenance > Engines > Diesel
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Diesel This is a new forum dedicated to diesel engines and their applicable accessories.


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Old 09-07-2012
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Smoke on the Water

Hey ,

my yanmar single started smoking out of the harbour a few weeks ago, out of the exhaust through hull ( raw water cooled). Was down a bit of oil so topped up; ran a few more times, shorter runs but no problem, checked the oil, then again the other night it started smoking down in the engine comp.... almost had a battery smell to it ..
there are no obvious leaks on the manifold, or block, oil level seems ok....
could I be cooking the batteries? What about the smioke out of the exhaust ???

It has given me no trouble in the last three years exept when I blew an impellor, and sort of overheated it once two years ago...

there is a squeeking noise coming from down below, I ad attributed to the stuffing box which is not dripping as it should, but doesn't seem to get hot ? and ther is a small amount of filings in the trans case oil, which is over filled.

I have noticed a bit of oil dripping on the bottom of the block area, but it's always been there....

Any suggestions as to where to start would be appreciated.

M
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Old 09-08-2012
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Re: Smoke on the Water

How loud is that sound? Could it be coming from a loose belt? If you are getting smoke in the cabin maybe it's from a loose belt that is burning up?

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Old 09-08-2012
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Re: Smoke on the Water

Thank you, it is a bit loose although it turns, maybe not as fast as the pulleys? What amount of play should it have ? 1/2 inch ?
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Old 09-08-2012
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Re: Smoke on the Water

There should be no visible slippage between belt and pulley.. if you can SEE that then it's likely the cause of the noise and maybe smoke, belt needs to be tightened. 1/2" play sounds too slack, but there's plenty of reference material on the web..
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Old 09-08-2012
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Re: Smoke on the Water

The color of the smoke will give u a clue...could be water or crackcase oil or some other impurity in the fuel.
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Old 09-08-2012
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Re: Smoke on the Water

Check for prop fouling before doing anything.
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Old 09-08-2012
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Re: Smoke on the Water

If the smoke has been coming from a loose belt, the odds are the belt and pulleys are now glazed, coated with burnt rubber. In which case you remove the belt, use some very fine sandpaper to remove the glaze from the pulleys (because it will make the next belt slip) and replace and tension the new belt.

Every belt company has instructions for how to use a ruler to measure the center distance between the pulleys and then set deflection to create the right tension, but you can also get a belt tension gauge to do that job. Too much tension usually kills bearings, so a gorilla job is not good either.
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Old 09-09-2012
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Re: Smoke on the Water

Does sound like a loose belt. Easy to fix, my friend. Try tightening it up a bit.
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Old 09-12-2012
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Re: Smoke on the Water

It is tough to diagnose the problem(s) without more detailed information. It could be a lot of things. What colour is the engine smoke? Black is an engine starved for air or laboring over loaded. Blue-grey is engine oil burning. White is potentially steam from water getting into the cylinders.

As for the interior smoke, if it is not exhaust then it could be a slipping belt, or it could be alternator failure. If the belt was slipping that badly then it would be polished, and the pulleys would be very hot. You would also see rubber dust around it.

there are all kinds of theories that could be thrown out there without more info!
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