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Thread: Mercury Mark 15

  1. #1
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    Mercury Mark 15

    I have had this motor for many years but just now getting around to it. I am guessing middle 50s serial #717225. Everything looks original, as far as I know, and crankcase still has lead seal. Crankshaft turns easily and motor has compression. Cowling has no cracks or missing parts. Never seen fuel hook up like this so I'll be needing one of those and I am sure I'll have a few questions along the way. Simplicity is astounding.

    Rock
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    Team Junk

    No sparkling wiggles in here, only dump truck grinches.

    "Screamin Heathen"

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  3. #2
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    The pressurized tank...I have a very nice specimen..or do the conversion to the pulse pump. Anyhoo good to see this. I love 50s outboards
    https://photos.app.goo.gl/k6mwuE2P8D6sGS689

  4. #3
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    Quote Originally Posted by Capt.Insane-o View Post
    The pressurized tank...I have a very nice specimen..or do the conversion to the pulse pump. Anyhoo good to see this. I love 50s outboards
    https://photos.app.goo.gl/k6mwuE2P8D6sGS689
    Hopefully you can find a tank in the back of your garage that came with the motor- the old pressure tanks are hard to find in working order along with the conversion parts. Even back in the early '60s we wouldn't touch a used Mark 15/20 Merc unless it came with a working tank and hose assembly. I chose to stick with my gravity feed "tank on powerhead" Merc KG4 and KG7 Hurricanes until I could scrounge the bucks for a used Mark 25 with a real fuel pump. I looked in my boneyard to see if I had a tank I could give you- but all I found was a few parts from an old OMC pressure tank. I have a restored KG4 in the basement that I bought as parts in a box back in the early '80s. Runs good but smokes like crazy on 24:1 oil compared to motors running at 50:1 mix.
    Doug

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    Pressurized fuel system eh. At least that answers one question.

    Rock
    Team Junk

    No sparkling wiggles in here, only dump truck grinches.

    "Screamin Heathen"

  6. #5
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    I come across the merc pressure tanks pretty often in large antique malls. Just found another omc tank in PA to add to my stockpile. Ill grab the next one I find and let you know
    1977 Hydrostream Vector 2.5 Promax

  7. #6
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    I will pick mine up from the up north shop tomorrow. That is the "cruiser" mark 15. Kind of a rare little motor.

  8. #7
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    You can use any....... newer......Merc pump from a 1 hose motor......The screw patten is the same....

  9. #8
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    Well I spun motor and had spark on one hole. Pulled the flywheel to clean points and after doing that I have no spark. Ordered new condensers as everything else looks to be ok.

    Rock
    Team Junk

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  10. #9
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    Just a bit of lint..........a wire touchin the Grnd........The cam is on the shaft on that one rite? I used to do the Mags for the 44 motors.....play with the point setting tilll I had a spark that would jump 5/16 at the coil....at hand speed. I have.....a 4 cly Merc drone motor.... the mag comes off and is not attched to the motor....scliilar Like what was on KG7s..... only bigger.....can't get spark out of it........gotta play w/ it........

  11. #10
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    Anyone have any of the old style siamese hose for the tanks. I have a 20H with a three gallon pressure tank. The hose is shot.

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  13. #11
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    Beautiful motor! I'm glad you saved another one from the scrap pile.

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  14. #12
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    Quote Originally Posted by Richard View Post
    Anyone have any of the old style siamese hose for the tanks. I have a 20H with a three gallon pressure tank. The hose is shot.
    The omc hose works fine.

  15. #13
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    Well it fired. Now it's time to address the fuel system but first I am going to undo lower and see what I can see.

    Rock
    Team Junk

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  16. #14
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    Pulled lower and it's not good. Need to make a couple tools for disassembly or find a complete lower.

    Rock
    Team Junk

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    "Screamin Heathen"

  17. #15
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    Best off....at least what I have seen with old salty motors is drill the cover plate........ I might have some NOS ones......I might have acess to the tools....

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