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post #1 of 8 Old 08-11-2010 Thread Starter
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Yanmar YSM-8 Exhaust ?

When running the engine at 1500rpm no problem, when running at 2000rpm exhaust water turns black.

What's up and what to do?

Thanks.

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post #2 of 8 Old 08-11-2010
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so you have a py26,so do i ,extreme black smoke is caused by over propped,dirty bottom, over sized alternator,some black smoke at higher throttle is very common,is this a recent problem? if so this could also be caused by a faulty injector actually i gain very little extra speed buy increasing the throttle so i normally just leave at about half throttle and wash the stern often lol
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post #3 of 8 Old 08-11-2010 Thread Starter
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Thanks Knots. It is a new problem. Cleaned the tank this past winter and replaced fuel filter assembly, don't know if that has anything to do with it. At 2000rpm it's not just black smoke but the water is black and sooty.

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post #4 of 8 Old 08-11-2010
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Is this a new boat to you? Did you change the prop? The exhaust water turning black indicates that you're putting too much fuel into the engine and creating soot—carbon black, so the water is getting colored by it.

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post #5 of 8 Old 08-11-2010
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in that case i'm betting on a bad/clogged injector,just remove it and get it checked,if the spray/mist is just dribbling out it won't combust properly,might be a good idea to check for air intake and exhaust restrictions too.btw is it starting normally?
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post #6 of 8 Old 08-11-2010 Thread Starter
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Dog - Boat is not new to me. Only changes to engine and its extremities are those mentioned earlier. If too much fuel how do I adjust? Is there an adjustment capability on the pump?

Knot - Starts without difficulty. I'll check the injector, had some problems with the engine dying on me last season and was the reason behind cleaning tank and changing filter assembly, maybe the injector needed some TLC also.

Appreciate the help and ideas.

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post #7 of 8 Old 08-11-2010
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i doubt its possible to get too much fuel,a diesel has[should] have an almost unlimited air supply so if it gets too much fuel the rpm's will max.,sky the limit until the valves begin to float or the engine blows,therefor only engine overload or faulty combustion [incorrect timing not very likely here],is likely to cause it too appear to be getting too much fuel.are you positve the engines not being overloaded by a dirty bottom,fouled prop or shaft,or even a bad alternator,getting the injector checked will atleast eliminate one possibility
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just don't get discouraged or spend gobs of money,you will eventually find your problem
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