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Volvo Penta Diesels Black Soot

DIESEL engine, transmission and generator repair and maintenance discussion forum.
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Topic author United States of America
johnmbath
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Vessel Info: 2002 Carver Voyager 570 Pilothouse
Location: Oxnard, CA

Volvo Penta Diesels Black Soot

Postby johnmbath » October 27th, 2025, 2:28 pm

I recently purchased a 2002 Carver 570 Voyager with Volvo Penta Diesels TAMD74EDC 480 HP each

During the initial Sea Trial, there was Black Soot covering the back of boat, swim step and cockpit area.
We assumed it was due to the engine surveyor pushing the engines to 2600 rpm's.

Recently, we made a 4 hour trip to channel islands, cruising at 1800 rpm's and found the Black Soot was again covering the back of boat.

Any suggestions what would be the cause?

John Bath
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waybomb
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Vessel Info: 1995 Boston Whaler Rage15
1987 3697 Carver Mariner
1988 Cougar 46 Kevlar Vee offshore
1969 15' Glasspar / 1967 Johnson Electromatic 85
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Re: Volvo Penta Diesels Black Soot

Postby waybomb » October 27th, 2025, 3:08 pm

Black soot means unburned fuel
Is the bottom of the boat clean?
What is the wot rpm spec and what is your actual wot?
How old is the fuel?
Thanks
Fred
1969 Glaspar Avalon /1967 Johnson Electromatic 85
1987 Carver Mariner
1988 Cougar Kevlar 46' with triple blown 572 ci
1995 Boston Whaler Rage
Past - 1988 2807, 1989 4207 Aft
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Topic author United States of America
johnmbath
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Joined: August 11th, 2025, 3:18 pm
Vessel Info: 2002 Carver Voyager 570 Pilothouse
Location: Oxnard, CA

Re: Volvo Penta Diesels Black Soot

Postby johnmbath » October 27th, 2025, 5:26 pm

Thanks Waybomb
Bottom paint is new this June 2025.
wot rpm specis 2600 rpm, actual is 2500 rpm
600 gallons of new fuel added August 2025 to 100 gallons existing.

John
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United States of America
waybomb
CYO Moderator
CYO Moderator
Posts: 2678
Joined: February 5th, 2013, 9:24 pm
Vessel Info: 1995 Boston Whaler Rage15
1987 3697 Carver Mariner
1988 Cougar 46 Kevlar Vee offshore
1969 15' Glasspar / 1967 Johnson Electromatic 85
Location: Saint Joseph,Mi
Has thanked: 60 times
Been thanked: 479 times

Re: Volvo Penta Diesels Black Soot

Postby waybomb » October 27th, 2025, 5:57 pm

Any idea why you can't get 2600?
Injectors?
Thanks
Fred
1969 Glaspar Avalon /1967 Johnson Electromatic 85
1987 Carver Mariner
1988 Cougar Kevlar 46' with triple blown 572 ci
1995 Boston Whaler Rage
Past - 1988 2807, 1989 4207 Aft
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Re: Volvo Penta Diesels Black Soot

Postby Viper » October 27th, 2025, 5:59 pm

Injectors, air filter, turbo, wastegate....
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