Engine exhaust Black under load

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richie30's picture
richie30
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Joined: 12/12/07
Posts: 168
Engine exhaust Black under load

The exhaust coming from the back of the boat has alot of black in it. It was always there under load, but seems to be getting worse. Just pulling away from the dock now causes it.
A local diesel tech, told me it is likely the injectors....about a 700.00 job, but said this may not be the problem!
Any thoughts?
Thanks

Rich

Richard & Joan Bain
PAZZO Hull#1670
1997 Catalina 36 MK11
Bayfield, Ontario

My Day Job Below
www.richardbain.com
www.bineapress.com

BudStreet
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Joined: 9/4/09
Posts: 1127

Is it black all the time or just when you're increasing the power as you leave the dock? The latter is fairly normal, the former is not.

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bboggs
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Joined: 6/22/08
Posts: 144

My limited understanding is that black smoke indicates incomplete combustion. As you've been told, worn injectors that allow unatomized fuel to drip in the cylinders before the injector fires is a common cause. You might try checking that the airfilter is clean and un-obstructed before resorting to replacing/rebuilding the injectors.

I did have rebuilt injectors on my previous boat with good results.

Bill Boggs
s/v Palmetto Moon
1991 C36, Hull 1128
Herrington Harbor South
Chesapeake Bay

richie30's picture
richie30
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Joined: 12/12/07
Posts: 168

Appreciate your help! Thanks

Rich

Richard & Joan Bain
PAZZO Hull#1670
1997 Catalina 36 MK11
Bayfield, Ontario

My Day Job Below
www.richardbain.com
www.bineapress.com

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