Mercury KD4

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Viewing 15 posts - 16 through 30 (of 50 total)
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    Boonie

    Canada Member - 1 Year
    Replies: 38
    Topics: 2
    #226433

    Hey Dave, going to make sure these are no good first.
    Thanks

    Buccaneer
    Buccaneer

    US Member - 1 Year
    Replies: 4268
    Topics: 758
    #226439

    What should I use to seal small cracks in the coils?

    Do a search on Corona Dope

    Prepare to be boarded!

    Avatar
    opposedtwin

    US Member - 2 Years
    Replies: 737
    Topics: 226
    #226666

    Here’s a good tutorial on testing coils. I have tested 30-40 scintilla coils with this method. The cracking typically makes them bad but not always. And conversely, those without cracks don’t always test good.

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    Boonie

    Canada Member - 1 Year
    Replies: 38
    Topics: 2
    #226729

    So far 2021 is working in my favour. I have good spark at plugs. Turns out it was condenser and dirty point issues. when i tested the coils i had my meter on the wrong setting. Senior moment!
    Waiting for parts for the lower end. On to the power head. Then blast and paint.
    Anybody have an idea where i can get the period correct paint?
    Also when i rotate the the crankshaft it is very stiff to move?

    Avatar
    Boonie

    Canada Member - 1 Year
    Replies: 38
    Topics: 2
    #226730

    Thanks for the help Guys.
    Happy New Year

    bobw
    bobw

    US Member - 1 Year
    Replies: 1218
    Topics: 43
    #226740

    Peter McDowell at North York Marine will have your Mercury paint.

    http://www.nymarine.ca/

    Bob

    1954 Johnson CD-11
    1956 Johnson RD-18
    1958 Johnson QD-19
    1959 Johnson QD-20
    1957 Evinrude Fastwin 18

    "Every 20 minute job is only a broken bolt away from a 3-day project."

    Avatar
    Boonie

    Canada Member - 1 Year
    Replies: 38
    Topics: 2
    #226741

    I have used the dull aluminum for my Johnson projects from NY marine. It looks great but it has a fleck to it and it is quite shiny. Much different than the original Merc colour.

    bobw
    bobw

    US Member - 1 Year
    Replies: 1218
    Topics: 43
    #226758

    Perhaps his Mercury dull aluminum is a different formulation from his OMC dull aluminum. Don’t know for sure, as I don’t do Mercurys.

    Bob

    1954 Johnson CD-11
    1956 Johnson RD-18
    1958 Johnson QD-19
    1959 Johnson QD-20
    1957 Evinrude Fastwin 18

    "Every 20 minute job is only a broken bolt away from a 3-day project."

    Avatar
    Boonie

    Canada Member - 1 Year
    Replies: 38
    Topics: 2
    #226807

    Talked to Peter McDowell today same dull aluminum used on both Johnson and Mercs. Checked the compression today top cylinder is 110 lbs and bottom is 80lbs. There is no play when the pistons are in the middle of thier stroke but when they reach tdc and switch to thier downward movement there is definately some play-slop for lack of a better term. In other words the crank will move slightly before the pistons start to move. Also seems to be some resistance turning the crank with the plugs out. Do these things seem normal?the resistance almost feels like a bad crank bearing?

    Tubs
    Tubs

    US Member - 1 Year
    Replies: 3373
    Topics: 89
    #226879

    The lack of movement as the pistons is changing
    direction is normal. You will have some resistance
    turning the crank with the plugs out as your moving
    the rings and the pistons through the cylinders. There
    is no way for us to tell if what your experiencing is
    normal however it should be smooth. Other
    places where resistance could occur is it the
    magneto or the lower unit. Compression is low in
    the bottom cylinder but there is a chance that the
    rings are just stuck. Using today’s oil along with
    the heating and cooling cycles of running the motor
    could free them up over time. If not you will need to
    take out the pistons.

    You're only as smart as the person you're talking to.

    • This reply was modified 2 weeks, 4 days ago by TubsTubs.
    • This reply was modified 2 weeks, 4 days ago by TubsTubs.
    Avatar
    Boonie

    Canada Member - 1 Year
    Replies: 38
    Topics: 2
    #227009

    Where would I even start to find rings for this old motor?

    Avatar
    jeff-register


    Replies: 1254
    Topics: 48
    #227011

    First,
    check with a ohmeter from 3k to open from ground to spark plug to test the secondary windings

    Tubs
    Tubs

    US Member - 1 Year
    Replies: 3373
    Topics: 89
    #227067

    Where would I even start to find rings for this old motor?

    You can put an ad in our classified.
    Members often have NOS rings.
    If that doesn’t work out go to
    Otto Gas Engine Works.- http://www.ringspacers.com

    You're only as smart as the person you're talking to.

    Avatar
    mercuryspecialist


    Replies: 80
    Topics: 9
    #227154

    Happy New Year,

    I sent you a private message as we have the new piston rings on-hand. We can help with many other parts for a KD4 or most any vintage Mercury (and a growing amount of Evinrude and Johnson) as well (our family marine business turned 65 years old as a corporation yesterday, and is 70 years old since it’s founding this year – all the while with boats, outboard motors, and such).

    Thank You,
    Joe

    mercuryman
    mercuryman

    US Member - 1 Year
    Replies: 436
    Topics: 158
    #227157

    Two coils are on Ebay Military Surplus Coils 13206E140 $14.50 & 9786E128 $24.50 Both work great , must make small mod to spark connection

    • This reply was modified 2 weeks, 1 day ago by mercurymanmercuryman.
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