bypass cover for a Johnson AD-10

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This topic contains 19 replies, has 8 voices, and was last updated by todd281 todd281 2 weeks, 2 days ago.

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  • todd281
    todd281
    US Member - 1 Year
    Replies: 36
    Topics: 14
    #177409

    I am working on this AD-10 outboard and have decided to change it, for now to a single line fuel system. I know that I can plug one of the holes in the check valve that is located in the reed plate, and use that port for the pulse to a fuel pump. However I was pondering if a bypass cover was made, for another motor, that would have the mounting holes to accept a fuel pump, and fit on this 7,5 HP. This would place the pump under the cowl neatly, and forgo using a extra pulse line. Anyone have a part #, or seen such a animal in captivity? Thanks

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    fleetwin
    US Member - 2 Years
    Replies: 2659
    Topics: 32
    #177477

    First, I think you must plug one of the hole, but then remove the other check valve, so the pump will get both negative and positive pulses….
    I don’t think there is another engine with a bypass cover that will fit the 7.5hp, unfortunately. You might take one of the covers to a welding shop and have them build up the surface of the outstide of the bypass cover so it is flush with the outer edge. This way, you can drill the two holes that are threaded for mounting, and you can drill a third hole directly through the cover for the pulse, then mount the small pump using the standard fuel pump gasket, just like on later style engines….

    frankr
    frankr
    US Member - 1 Year
    Replies: 4244
    Topics: 43
    #177486

    I used to make fuel pump adapter plates, but gave it up for lack of interest. Help yourself to the idea.

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    todd281
    todd281
    US Member - 1 Year
    Replies: 36
    Topics: 14
    #177491

    yup i think i will take a stab at making a adapter , I bought a replacement powerhead so I will have 2 “extra” by-pass covers. I also have the ability to weld aluminum here in the shop so I will toy with it. I just thought maybe there was one OME . No seance in reinventing the wheel. Thanks and I’m off to the workbench..

    todd281
    todd281
    US Member - 1 Year
    Replies: 36
    Topics: 14
    #177492

    frankr, if you could tell me, were your adapters bolted over the bypass cover just put a hole in it , or did you remove the OME cover and bolt directly to the block?

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    chris-p
    Canada Member - 1 Year
    Replies: 2462
    Topics: 157
    #177495

    You leave the bypass cover on.

    I like to fill the void with JB Weld, before installing a plate.

    frankr
    frankr
    US Member - 1 Year
    Replies: 4244
    Topics: 43
    #177513

    Yep, leave cover on and make a gasket to go between cover and adapter plate. Fill the void with JB. Doesn’t have to be a perfect fill, you are just getting rid of the big air pocket. Sand the whole surface flat for a good gasket seal.

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    garry-in-tampa
    Lifetime Member
    Replies: 3072
    Topics: 30
    #177523

    Frank Robb used to sell an adaptor plate that hod holes that let you use longer bypass cover screws to fasten it to the motor. The plate was drilled and tapped the accept the standard pump. The only modification to the engine was the drill through the center hole so the pump could pick up the pulses. . .

    todd281
    todd281
    US Member - 1 Year
    Replies: 36
    Topics: 14
    #177525

    sounds good thanks for all the info, I will make one as suggested that way if I ever get the pressure tank fixed, I can just remove this and put on the un-modified cover. Now if I could just find some match for “Holiday bronze” paint that’s not 20 bucks a spray can .

    RICHARD A. WHITE
    RICHARD A. WHITE
    US Member - 2 Years
    Replies: 1582
    Topics: 126
    #177527

    What is wrong with the pressure tank?

    http://www.richardsoutboardtools.com

    todd281
    todd281
    US Member - 1 Year
    Replies: 36
    Topics: 14
    #177530

    it needs rebuilding, gaskets and such. Mostly its missing the two line connector , and so far the $s on them are crazy . I am cleaning and working on it , keeping a eye peeled for the connector and parts. But that’s on the back burner , first the motor.

    RICHARD A. WHITE
    RICHARD A. WHITE
    US Member - 2 Years
    Replies: 1582
    Topics: 126
    #177531

    Ahh, like Bendix points, we tend to hoard those connectors..

    http://www.richardsoutboardtools.com

    todd281
    todd281
    US Member - 1 Year
    Replies: 36
    Topics: 14
    #177539

    yep. I hoard everything , I have powerheads in the shop , no idea what they fit but I’m keeping them in case…. Not sure if I should post in another thread but on this AD-10 can some one tell me if that “Holiday Bronze” was a metallic / flake paint or gloss semi-gloss paint?

    • This reply was modified 4 weeks ago by todd281 todd281.
    todd281
    todd281
    US Member - 1 Year
    Replies: 36
    Topics: 14
    #177541

    think its time for a impeller ..

    • This reply was modified 4 weeks ago by Mumbles Mumbles.
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    Mumbles
    Mumbles
    Canada Member - 2 Years
    Replies: 4104
    Topics: 420
    #177547

    About twenty years ago, before I had even heard of this club, I mounted a small square fuel pump on a ’57 Fleetwin 7.5 horse but I went about it a bit differently. It was mounted directly on the crankcase while the motor was apart. Everything was threaded and epoxied to hold it in place and it tucks away nicely on the starboard side.

    The motor is in storage so I should go and try to get some photos of it to help explain what I mean. Back then I didn’t have any digital cameras and I never got any Kodachromes of it.

    • This reply was modified 4 weeks ago by Mumbles Mumbles.
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