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I would check the mixing elbow for carbon build up. Take it off and chip out the build up. Then check the whole exhaust system. Pretty sure that low load running ie battery charging will cause this build up.
Amelia in the Ionian
On 22 Aug 2019, at 16:58, Mike Ondra via Groups.Io <mdondra@...
We had similar carbon discharge from the Onan during spring start up, powder as well as chunks of carbon. Ultimately the Onan would not start. Opening up the exhaust mixing elbow revealed huge carbon buildup leaving only about 1 cm diameter air passage for the exhaust. Not at all uncommon when marine diesels are not run periodically under high load. That would be the first place I would look.
Aletes SM 240
On Aug 22, 2019, at 8:45 AM, Mark Erdos <mcerdos@...
Can you give
more information? Is it when you start the Onan or all the time? Is it oily or
carbon? What model Onan and boat is this on? How you done anything to troubleshoot
and if so what were your findings?
- Cream Puff - SM2K - #275
cruising - Vista Mar, Panama
Dear AMEL Group / Owners
I appreciate your ideas about the reason I have black water comes from my onan
11 raw water exhaust hose
And from exhaust fumes too ( less quantity )
The Onan was 1200 hours and was serviced at 100 hours
Thanks in advance