yanmar smokes when accelerating.... - SailNet Community

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Old 06-23-2013
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Red face yanmar smokes when accelerating....

Hi all,

the single lunger seems to smoke and emit some black oil just when I accelerate . then it seems to be fine.... are there rings in a diesel that could be going ? I get about 5.5 knots at 80 % throttle in calm air, so it seems to have lots of power (compression)??.
Thanks in advance.

Mike
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Old 06-23-2013
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Re: yanmar smokes when accelerating....

Hi Mike

It will most likely be a dirty prop.
You need to dive on the propeller and scrape the barnacles off.

Please take my advice and scrape the prop and then take the boat out BEFORE you spend money on a mechanic etc. Folks have spent thousands and thousands on their engines and the problem still continues till the prop is clean.

I know it sounds too simple.


Mark
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Old 06-23-2013
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Re: yanmar smokes when accelerating....

Check the air filtre.
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Old 06-23-2013
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Re: yanmar smokes when accelerating....

+1 what Mark said.

The black smoke is unburned fuel.

In my case cleaning the prop made no improvement, but the problem was still the prop. I ended up having to take the prop off and had it re "tuned" (not sure what the proper term is), but the prop specialist heated the prop and adjusted the pitch of the blades. After that, all good!

Last edited by Goldfinger; 06-23-2013 at 09:57 PM. Reason: Bad smelling... er spelling
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Re: yanmar smokes when accelerating....

I agree, black smoke usually means the engine is starving for air.
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Old 06-24-2013
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Re: yanmar smokes when accelerating....

Usually dirty prop. Rev it in neutral, if no black smoke its the prop. If black smoke check to make sure oil is not overfilled. If not then take of air filter, then start looking deeper.
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Re: yanmar smokes when accelerating....

The dirty prop diagnosis is interesting. To me it seems counter-intuitive. If prop blades are fouled, they are going to be less efficient due to cavitation. A cavitating prop is going to result in LESS load on the engine, not more! While it is true that an overloaded engine produces black smoke, i can't see how a dirty prop could cause that unless the prop was fouled with a piece of rope that creates more friction? I suppose a severely fouled prop would have so much mass in growth that its own inertia resists the acceleration, but you would think in a severe case like that it would have trouble getting the boat moving at all.
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Re: yanmar smokes when accelerating....

It's the load (usually in combination with a foul bottom).
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Re: yanmar smokes when accelerating....

Quote:
Originally Posted by GaiaOrion View Post
Hi all,

the single lunger seems to smoke and emit some black oil just when I accelerate . then it seems to be fine.... are there rings in a diesel that could be going ? I get about 5.5 knots at 80 % throttle in calm air, so it seems to have lots of power (compression)??.
Thanks in advance.

Mike
I had the same problem awhile back. Here's the whole thread on Sailnet.

Here's what my problem turned out to be.
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Re: yanmar smokes when accelerating....

Wow! How the heck were you even able tp get anywhere with that much growth!
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