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Old 17-02-2014, 18:27   #31
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Re: black smoke underload

Just to keep things clear ..... white smoke is not necessarily unburned diesel. It could also be water as in failed impeller. Unburned fuel smoke is a bit grey/white in colour while water is most definetly white
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Old 17-02-2014, 22:21   #32
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Re: black smoke underload

That's steam.. smells better than smoke
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Old 18-02-2014, 18:18   #33
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Re: black smoke underload

Steam usually dissipates quickly, smoke not so quick
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Old 18-02-2014, 18:28   #34
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From my own experience, my diesels have emitted black smoke from these causes:

1) initially over propped during refit
2) fouled bottom, prop
3) overloading the motors.

When the injector pump and injectors needed rebuilding, i had grey smoke and noticed unburnt fuel in the exhaust water.
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Old 19-02-2014, 08:48   #35
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Re: black smoke underload

Quote:
Originally Posted by neptunesjester View Post
From my own experience, my diesels have emitted black smoke from these causes:

1) initially over propped during refit
2) fouled bottom, prop
3) overloading the motors.

When the injector pump and injectors needed rebuilding, i had grey smoke and noticed unburnt fuel in the exhaust water.
I think overloading the engine is the most common cause. I have also seen where a faulty injector can cause black smoke and also result in excessive cylinder wear, like adjacent cylinders with several thousandths wear and the affected cylinder with fifteen. The owner bought a new short block, that is the engine minus the head and accessories. I thought he should have rebuilt it.

If you are getting smoke of any kind after warmup, investigate to avoid spending money needlessly, or having the engine quit.
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