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How to reduce Diesel smell

Old 03-10-2019, 07:07 PM
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Post How to reduce Diesel smell

I'm about to buy a 1994 Blackfin 29 which I loved in the water, it has 2 Yanmar engines 2012 and 800 hours with 315 hp each. I have a lot of experience with gasoline outboards, but have never owned diesel engines. The only thing that's keeping me from buying it, is that it has a very strong diesel smell. I've spoken to several people with experience in this type of engines and they say it could be injectors, air filter or racor filters. But doing a little research I see that this smell can also be reduced considerably by adapting a Vetus wet exhaust system. Has anybody tried it? Can it really reduce the smell? I'm still checking injectors, and filters though.
Best regards.
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Old 03-10-2019, 08:49 PM
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Diesel exhaust smell or raw fuel? If raw fuel was leaked into the engine compartment, you may never get the smell out.
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Old 03-10-2019, 10:04 PM
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Mechanical injection diesel boats smell like diesel. You get used to it, or you stick with outboards. If its the exhaust, thats normal.
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Old 03-10-2019, 10:44 PM
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pas
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I have the exact same engines in my boat and there is not any diesel smell whatsoever. That boat must have a fuel leak somewhere.
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Old 03-10-2019, 11:13 PM
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Here's a product with optimistic marketing:
Boaters: How to Permanently Get Rid of Diesel and other Boat Ddors


Some boaters just wipe down with vinegar, baking soda water , maybe lemon juice. to help a bit. Dawn night help in the bilge and with cleaning engines, and transoms. It does dissolve oil & oily soot.

As asked above, where is the odor originating?
Does the engine have diesel residue on it? Is there ANY diesel in the bilge? Is it spilled on the side deck near the fill? Is the transom sooty from rich exhaust?
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Old 03-11-2019, 09:20 AM
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Im sorry I didn't specify, it is a strong Diesel Exhaust Smell on the deck and even on the flybridge while the motor is running. I think it is not burning the fuel. It feels like a rich fuel mixture. pas Do you have the same smell?

Last edited by Theseabear; 03-11-2019 at 09:26 AM. Reason: Needed to add a comment
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Old 03-11-2019, 11:45 AM
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Originally Posted by Theseabear View Post
Im sorry I didn't specify, it is a strong Diesel Exhaust Smell on the deck and even on the flybridge while the motor is running. I think it is not burning the fuel. It feels like a rich fuel mixture. pas Do you have the same smell?
You are getting the station wagon effect where the exhaust gasses are being sucked back into the cockpit and bridge. If the engines run good and get the correct fuel economy, you might try extending the exhaust ports to get the be exhaust into the air that passes by the side of the boat. Something to look at, engine wise, is the boost pressure. If the turbos aren't making proper boost the exhaust might be sooty. black smoke on the transom is an indicator. Installing boost gauges is easy. Put a 1/4 npt port on the intake manifold and put a manual pressure gauge on it with a rubber hose.
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Old 03-11-2019, 12:11 PM
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First thing to do is have an expert Yanmar mechanic go over them completely by performing a full survey. There could be any number or combination of causes. Where are you located?
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Old 03-11-2019, 12:33 PM
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Originally Posted by Theseabear View Post
Im sorry I didn't specify, it is a strong Diesel Exhaust Smell on the deck and even on the flybridge while the motor is running. I think it is not burning the fuel. It feels like a rich fuel mixture. pas Do you have the same smell?
If it is not burning fuel you should see a sheen of fuel in the back of the boat while idling at the marina. If it's just the station wagon effect it comes with the territory. Different people have done different things if they can't stand it. The simplest thing that helps are air directors placed at each side of the boat at the forward part of the cockpit to force air into the cockpit to help blow the cockpit with fresh air. I have seen them on many boats. In one extreme case there was a Bertram where the guy's wife couldn't stand it so bad he had the exhaust run up into an arch over the tower.

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Old 03-11-2019, 12:59 PM
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Where do the exhausts exit the hull? On the sides or rear?
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Old 03-11-2019, 02:17 PM
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Originally Posted by Theseabear View Post
Im sorry I didn't specify, it is a strong Diesel Exhaust Smell on the deck and even on the flybridge while the motor is running. I think it is not burning the fuel. It feels like a rich fuel mixture. pas Do you have the same smell?
Once in a while backing up I will smell the exhaust but normally I get no exhaust smell. maybe if I was trolling directly downwind but I would have to be perfectly ,lined up with the wind.

Below planing speeds my exhausts are underwater once I am moving the exhaust is behind me.
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Old 03-11-2019, 05:19 PM
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If it's smelling at the dock, you will have to fine the fuel leak.
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Old 03-11-2019, 05:52 PM
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Originally Posted by VetteLT193 View Post
If it is not burning fuel you should see a sheen of fuel in the back of the boat while idling at the marina. If it's just the station wagon effect it comes with the territory. Different people have done different things if they can't stand it. The simplest thing that helps are air directors placed at each side of the boat at the forward part of the cockpit to force air into the cockpit to help blow the cockpit with fresh air. I have seen them on many boats. In one extreme case there was a Bertram where the guy's wife couldn't stand it so bad he had the exhaust run up into an arch over the tower.
It probably would have been cheaper for the guy with the Bertram to find a new wife...

Also Ive got twin yanmars in my express. I get a slight sheen in the water at idle and a little bit of soot above the waterline level side mounted exhaust outlets if the waves are pushing it into the boat but Ive never had an issue with smell. Even running in the slip with the cockpit cover on but unzipped for entry.

Actual diesel fuel smell is another animal. I used to work at a fuel dock and Ive thrown away tons of shirts because that shit just doesnt come out.

My guess is you either have a super sensitive nose or have a lot of smoke at idle and other speeds (eg - issue)
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Old 03-12-2019, 12:51 PM
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Ive got a 29 combi with yanmar 6lpa's and sometimes I get the station wagon effect. In the combi im able to unzip the front strataglass a little to get air movement and eliminate the problem. I was thinking of clamping these on to the exhaust tips to divert the fumes towards the sides of the boat underway and into the slipstream. https://www.fisheriessupply.com/trid...-bellows-elbow Worth a try and cheap solution if it works. Need to be careful not to create any back-pressure.
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Old 03-12-2019, 02:58 PM
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Originally Posted by VetteLT193 View Post
If it is not burning fuel you should see a sheen of fuel in the back of the boat while idling at the marina. If it's just the station wagon effect it comes with the territory. Different people have done different things if they can't stand it. The simplest thing that helps are air directors placed at each side of the boat at the forward part of the cockpit to force air into the cockpit to help blow the cockpit with fresh air. I have seen them on many boats. In one extreme case there was a Bertram where the guy's wife couldn't stand it so bad he had the exhaust run up into an arch over the tower.
I saw that boat years ago in the Bahamas. Think it was at Treasure Cay
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Old 03-12-2019, 07:27 PM
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Originally Posted by peterg45 View Post
Ive got a 29 combi with yanmar 6lpa's and sometimes I get the station wagon effect. In the combi im able to unzip the front strataglass a little to get air movement and eliminate the problem. I was thinking of clamping these on to the exhaust tips to divert the fumes towards the sides of the boat underway and into the slipstream. https://www.fisheriessupply.com/trid...-bellows-elbow Worth a try and cheap solution if it works. Need to be careful not to create any back-pressure.
Those would work. I've seen people use straight extensions attached to their swim step. A friend of mine used fiberglass 45's on his boat.
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