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Soot on transom and dinghy

DIESEL engine, transmission and generator repair and maintenance discussion forum.
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Scurvy Dog
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Joined: August 4th, 2014, 11:21 am
Vessel Info: Carver 440 1996

Soot on transom and dinghy

Postby peterrenton » August 4th, 2014, 11:28 am

Hello everyone,

I am having a major problem with soot mainly all over my dinghy as well as the transom of the boat. I have the Cummins diesel package of 475 hp engines. The exhaust has tips on it that discharge the exhaust to the side of the boat just ahead of the swim platform. My engines only have 830 hours on them and I am wondering what is causing all this soot. I typically run the boat around 9 knots and step it up now and then. The engines are running perfectly and I've tried additives and the like with no success. I am thinking of exhaust extensions to the back of the swim platform to see if this would help.
Has anyone else had this type of problem?
Thanks for any insight you could provide.

Carver 440

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Scurvy Dog
Scurvy Dog
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Joined: August 4th, 2014, 10:39 pm
Vessel Info: 1998 Carver 530 Voyager Pilothouse

Re: Soot on transom and dinghy

Postby kkochner » August 4th, 2014, 11:39 pm

Yep the same thing happens on my 530 voyager...it pretty common on diesel engines to have that even when they are running great. My buddy has a carver as well and he has the same thing too. I personally dont think extensions would do much. I have gotten in the habit of wiping down my transom as part of my ritual:)
1998 Carver 530 Voyager Pilothouse
Volvo Diesel Engines
Port of Tulsa OK
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Scurvy Dog
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Vessel Info: 2001 Carver 466 MY
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Re: Soot on transom and dinghy

Postby carvergofast » August 5th, 2014, 1:19 pm

I am having the same problem on my 466 with Volvo 480 HP TAMD, does anyone know a cleaner that will clean well without removing the wax?
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Scurvy Dog
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Joined: June 18th, 2017, 11:56 pm
Vessel Info: 2002 CARVER 530 Voyager PilotHouse

Re: Soot on transom and dinghy

Postby geauxcruise » August 13th, 2017, 4:38 pm

I know the above post are three years old, but if any of you guys are still around, any news on the findings of the cause?

I have a new to me 2002 Carver 530 that has done it one time and one time only. The only thing I can attribute it to was an extended period of idling speeds and then stepped it up to only about 1650 rpms for about an hour or so. I "think" it has something to do with the idle speed building up soot, and then when I went to 1650 rpms, it was not enough for the turbos to clean it all out. Ever since it happened the one time, from any time period of idling, if I want to open it up for a while, i go to 1850 rpms. Have had no more issues with soot since dong that.

Would love to hear back from you guys or anyone else who can comment.

P.S. First time to post on this forum. Have learned a lot form a lot of reading on here. Love it.
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Re: Soot on transom and dinghy

Postby mjk1040 » August 13th, 2017, 4:47 pm

Just wonder if you were at optimum operating temperature? Diesels need their heat to burn fuel efficiently. Aged fuel does not help either.
Mike :down:
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1989 Sea Ray Seville
1986 Carver Mariner 32'
1990's Thompson 22' Cuddy Cabin
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