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Generator exhaust fumes

Discussion of batteries, chargers, wiring, generators, distribution panels, battery switches, etc.
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Scurvy Dog
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Joined: June 22nd, 2013, 3:25 pm
Vessel Info: 1997 355 Aft Cabin
twin 454 Crusader XL
Location: Morehead City, NC

Generator exhaust fumes

Postby Luckyskiff » July 30th, 2013, 12:07 pm

My new to me Carver 355 AC has an issue with generator exhaust fumes getting into the salon. When I run the generator, the salon fills with fumes enough to set off the CO detectors. The exhaust smell also blows out the main AC ducts even though the AC unit is located in a compartment sealed off from the main bilge area.

Te local boat yard can't find any issues and said that the exhaust fittings are secure.

Does anyone have any other ideas on how to troubleshoot this issue. The generator is unusable right now.

Thanks for any help.

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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
1996 Boston Whaler Rage 15
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Re: Generator exhaust fumes

Postby waybomb » July 30th, 2013, 8:33 pm

I am going to make a bunch of guesses, so bear with me.

Does the Genny have a water muffler? Is the muffler getting water - the exhaust on the outside of the boat should be almost silent. If you can hear the exhaust, you may not be getting water.I would think the water would absorb most of the co and smell. The engine's cooling water should be routed to run through the muffler, and then exits the boat out the genny's exhaust pipe.

There's not much else between the exhaust manifold and the exterior of the boat. I would think the mechanics would have made sure the exhaust manifold gaskets are not leaking. With generator running, if they are leaking, you'll hear the leak and you'll see a discolored manifold. And if you run your hand along the engine/manifold joint, you'll feel the exhaust escaping. CAUTION - if the thing is leaking in the hull, make sure you have somebody topsides that could pull you out if you get overcome with co. Nothing to play with!

All that's left is hoses and connections. Everything should be double clamped, with tension in adjacent clamps opposite each other. I doubt the hoses are leaking, but it is a possibility. Run your hands along the hoses and feel for leaks. Retorque all the clamps.

Good Luck!
1969 Glaspar Avalon /1969 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: Generator exhaust fumes

Postby AaHubb » July 30th, 2013, 8:56 pm

Where is the exhaust outlet, is it near any open windows/ports?
'99 404 CPMY

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