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Old 06-15-2019, 12:31 PM   #1
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Default Fuel/Oil Buildup Under 2 Stroke Cowling

Two part question

#1
I've got an 8 hp 2 stroke Mercury outboard that seems wet under the cowling to me. This is my first outboard ever so I don't have a lot of experience with outboards. I've had this motor for about 3 years.
I use it on my drift boat. When going to and from the river I lay it flat in the bed of my pickup. Today I noticed the seal on the bottom of the cowling stretching and pulling loose, it's saturated in oil. The underside of the cowling is also wet with oil. Is this from transporting it on it's side?

#2
Not as important but would like input. I purchased a 2001 17x54 Willies DB a couple years ago. I called Willies and got a noncommittal answer if it was ok to tow the boat with the outboard attached. How many of you tow your driftboats with the motor attached.

Thanks in advance.

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Old 06-15-2019, 06:03 PM   #2
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Default Re: Fuel/Oil Buildup Under 2 Stroke Cowling

I have always towed mine on boat just make sure it's screwed down tight. Yes, the oil is most likely due to it being laid on it's side.

Last edited by 10-7; 06-15-2019 at 06:04 PM. Reason: misspelling
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Old 06-15-2019, 08:07 PM   #3
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Default Re: Fuel/Oil Buildup Under 2 Stroke Cowling

Fuel draining from the carb is most likely why it seems oily and wet under the cowl.
Put it on the boat and leave it there.
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Old 06-16-2019, 12:17 AM   #4
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Default Re: Fuel/Oil Buildup Under 2 Stroke Cowling

Besides the bow, the transom on a drift boat is the toughest part of the boat. As others have said, just leave the motor attached (well) for the drive home.

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Old 06-16-2019, 09:15 AM   #5
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Default Re: Fuel/Oil Buildup Under 2 Stroke Cowling

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Originally Posted by namu mac View Post
Fuel draining from the carb is most likely why it seems oily and wet under the cowl.
Put it on the boat and leave it there.
I was laying it with the handle side up as to not damage the handle. I was told that in doing so I have the carb side down and it is allowing it to drain into the cowling.

Engine degreaser and secure it to the boat.

Thanks guys for confirming my thoughts about the motor being transported on the boat.
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Old 06-17-2019, 01:14 PM   #6
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Default Re: Fuel/Oil Buildup Under 2 Stroke Cowling

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Originally Posted by I'd rather fish View Post
I was laying it with the handle side up as to not damage the handle. I was told that in doing so I have the carb side down and it is allowing it to drain into the cowling.

Engine degreaser and secure it to the boat.

Thanks guys for confirming my thoughts about the motor being transported on the boat.
Not a bad idea to bolt that sucker on as well and run with the motor down if clearances permit. The transom IS hollow!
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Old 06-18-2019, 10:01 AM   #7
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Default Re: Fuel/Oil Buildup Under 2 Stroke Cowling

In addition to the advice already given, check the oil reservoir, oil injection pump, and all of the lines. I had an injection pump go bad years ago and pressure from the reservoir would force oil past the pump, through the carbs, and out the exhaust while the boat was just sitting. Remedied by bypassing the pump and emptying the reservoir. Just ran premix fuel after that. There are other fixes, but involves replacing the oil injection pump which wasn't cheap years ago.
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Old 06-18-2019, 04:54 PM   #8
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Default Re: Fuel/Oil Buildup Under 2 Stroke Cowling

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Originally Posted by Pensacola View Post
The transom IS hollow!
Yeah, that was my concern. It's probably thin wall channel.
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Old 06-18-2019, 04:56 PM   #9
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Default Re: Fuel/Oil Buildup Under 2 Stroke Cowling

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Originally Posted by Merganser99 View Post
In addition to the advice already given, check the oil reservoir, oil injection pump, and all of the lines. I had an injection pump go bad years ago and pressure from the reservoir would force oil past the pump, through the carbs, and out the exhaust while the boat was just sitting. Remedied by bypassing the pump and emptying the reservoir. Just ran premix fuel after that. There are other fixes, but involves replacing the oil injection pump which wasn't cheap years ago.
Thankfully I don't think I have that issue since I premix fuel now.
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