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Outboard Technical Discussion This is our outboard engine related technical discussion forum. Topics include engine repair and maintenance, modifications, gearcases, electrical and electronics, etc. For technical assistance related to topics not outboard related please use our other Engine forum.

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Old 10-08-2019, 10:48 PM   #1
Tyannt
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Default Mercury outboard water intake modification

I came across a late 80's/early 90's Mercury 175Hp Black Max that had the water intakes on the sides of the propeller/gear housing filled over, and was told it now picks up water from the front of the propeller housing/cone. I felt a round hole i could stick my finger in. Was told the only drawback was if dragging the motor in the mud etc; would pickup junk...Additionally, i was told this modification allows the motor to be lifted higher, and still pickup water to cool the motor.



Is anyone familiar with this kind of modification?
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Old 10-09-2019, 09:32 AM   #2
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All true...
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Old 10-09-2019, 12:40 PM   #3
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Quote:
Originally Posted by Tyannt View Post
I came across a late 80's/early 90's Mercury 175Hp Black Max that had the water intakes on the sides of the propeller/gear housing filled over, and was told it now picks up water from the front of the propeller housing/cone. I felt a round hole i could stick my finger in. Was told the only drawback was if dragging the motor in the mud etc; would pickup junk...Additionally, i was told this modification allows the motor to be lifted higher, and still pickup water to cool the motor.



Is anyone familiar with this kind of modification?
Had the exact same thing on my old Starflite. It really helped with water pressure at high speeds after I put a hydraulic jack plate on. The average depth of my home lake is 90ft., so hitting bottom wasn't an issue for me, but if you are in a shallow body of water, be extra careful.
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Old 10-10-2019, 03:11 PM   #4
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Initially, i had thoughts that some enthusiast was checking out something he perhaps read about online! As it turn out he was, Lol I too was concerned; thinking of the consequences of sucking up mud, etc etc. I suppose i could always replace the lower
gear casing to return it to the original design...? After winterizing, could search for a stock housing to use next year..


Appreciate the reply!
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Old 10-13-2019, 10:20 AM   #5
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Appreciate the replies guys; wondered if this was some home made mod!



Is this done by changing to some aftermarket prop housing? Asking in case i have reason
to return to original...


Thanks

Last edited by Tyannt; 10-13-2019 at 10:21 AM. Reason: add info
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Old 10-13-2019, 07:29 PM   #6
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Bobs machine shop sells kits. If you have the ability you can install yourself or have a shop do it. You need to aluminum weld the new nose cone on, smooth out the work, install the plumbing hoses.
Some may try to duplicate the job without the kit but that would be a big PITA.

Without examining the work it might be pretty hard to tell how well the job was done.
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Old 10-13-2019, 09:54 PM   #7
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I had a first yr CLE lower, there was two intake holes in front large enough to place my pinky tip in. The problem was it would suck seaweed up, the finer and thready seaweed. Pieces small as finger nails would work its way up to the inspection plates creating cooling problems. I was forever jumping in the water (no beaches) to pull the inspection plate and slide my coat hanger button hook up to clean out the passages. Some times in 2 footers.
Mercury quickly changed the design and put 5 smaller holes up front. The Drag racers say the 2 hole lower was just a little faster then the updated CLE.
Good Luck with your project!
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Old 10-27-2019, 02:15 PM   #8
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Might I ask what a "CLE" is?
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