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Old 09-05-2015, 20:29   #16
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Re: Black exhuast

Quote:
Originally Posted by SVArgo View Post
Like a clog in the elbow?

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Yes. The combo of exhaust gas & saltwater is very corrosive and can cause clogging and even a rupture of the mixing elbow over time. If the exhaust is restricted then that would also restrict the amount of air getting into the engine.

Also, if you are new owners it could mean the boat was sitting for awhile before it was sold. If so, it could also be the injectors. When they sit they can foul over time, and that usually means too rich a mixture.

Then again, I'd also be inclined to try DeepFrz's suggestion of running the engine w/o the air filter. As he pointed out, it's one thing that's changed. Besides, it's easy! Fwiw, my Westerbeke's don't use air filters, although apparently other marine engines do. Something to check out . . . .

Anyone care to raise Tellie's wager, or should we just call?
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Old 09-05-2015, 21:42   #17
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Re: Black exhuast

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Originally Posted by Exile View Post
....
Anyone care to raise Tellie's wager, or should we just call?
1. Clogged elbow - as it fits the posted facts the best and because of Tellies undoubted experience
2. Bad injectors - as it fits the posted facts reasonably
3. Overpropped -as it fits the posted facts but why would the PO have it overpropped
4. Air filter - just possible. I follow the base logic and yes very easy to check but why would a new properly fitted air filter cause enough restriction right back 2500 rpm.

Or possibily a combination of the above if the PO was pretty slack with maintenence.

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Old 09-05-2015, 22:19   #18
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Re: Black exhuast

Try reving the engine in reverse. Does it rev to a higher rpm, before you get black smoke. If so, it's the prop. if it's still black at 2500 rpm, change the discharge elbow.
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