Mercury KD4

Home Forum Ask A Member Mercury KD4

Currently, there are 0 users and 1 guest visiting this topic.
Viewing 15 posts - 1 through 15 (of 140 total)

  • Boonie

    Canada Member - 1 Year
    Replies: 147
    Topics: 14
    #226332

    Hey everyone. This is my first time posting on this site. I am curently restoring a Mercury KD4 and i need some help with ignition coils. How to test if they are any good and if not, help finding replacements?


    green-thumbs

    US Member - 2 Years
    Replies: 475
    Topics: 38
    #226343

    Mercury KD4 (early) had Eisemann 72H magneto ignition system
    Bendix Scintilla magneto ignition systems were used on later KD4
    The magnetos are entirely different with no parts in common.
    SO,,,first order of business is to find out which magneto is on your KD4.
    and report back.
    Magnetos are not my strong point so hopefully some one will share
    a little know how with us.
    Louis


    billw

    US Member - 2 Years
    Replies: 1610
    Topics: 48
    #226352

    It has been my personal experience that the Eisemann coils always work and the Bendix ones never do, at least on Mercurys. (Why they seem to be okay on Champions I have had, I have no idea.) The Bendix coils are held in place with snap clips, while the Eiesmanns are held in place with screws. That is a quick visual ID of what you might have.

    Long live American manufacturing!


    Boonie

    Canada Member - 1 Year
    Replies: 147
    Topics: 14
    #226355

    They are bendix coils


    fifty20ne

    US Member - 1 Year
    Replies: 380
    Topics: 60
    #226360

    These Diagrams may help.

    Good Luck,

    Bob

    Chart1

    Chart3

    Chart4

    chart5

    Attachments:

    fifty20ne

    US Member - 1 Year
    Replies: 380
    Topics: 60
    #226366

    Chart6

    Chart7

    Chart8

    194620Mercury20ad20b

    Mercury-Outboards-Through-the-Years0015

    • This reply was modified 11 months, 1 week ago by fifty20ne.
    • This reply was modified 11 months, 1 week ago by fifty20ne.
    Attachments:

    fifty20ne

    US Member - 1 Year
    Replies: 380
    Topics: 60
    #226373

    MERCURY PARTS/PRICE LIST LINK.

    https://drive.google.com/file/d/0B6wRLMxPeVaiOWIxNDRkZWItOWRjMC00YTJhLTg3YWQtNDU3OWY2ZjRjZjlh/view?hl=en

    http://pub9.bravenet.com/photocenter/album.php?usernum=737212788&album=49338#bn-photocenter-1-1-737212788/49067/1/

    KD4

    KD4WLL

    KD4WLL2

    29e67456efbbe06c0d1ef69174758fe5

    • This reply was modified 11 months, 1 week ago by fifty20ne.
    • This reply was modified 11 months, 1 week ago by fifty20ne.
    • This reply was modified 11 months, 1 week ago by fifty20ne.
    • This reply was modified 11 months, 1 week ago by fifty20ne.
    Attachments:

    Boonie

    Canada Member - 1 Year
    Replies: 147
    Topics: 14
    #226381

    Thanks Bob. Could be a problem finding replacements!


    billw

    US Member - 2 Years
    Replies: 1610
    Topics: 48
    #226390

    They are bendix coils

    Well, all is not completely lost yet. Are they all cracked and disintegrating? Best not to try to use those. If, by some miracle, they are NOT all cracked, they MIGHT still work. Next steps would be to remove and CAREFULLY disassemble the points, and clean the contacts to like new condition. I say, “CAREFULLY,” because there are a lot of tiny little parts. Make particular note of where the tiny insulating bushings and washers go. Do one set at a time and make a drawing and/or take pictures of them, as you take them apart. Once the points are clean, ( I use 320 Emery cloth, changed frequently as the points are a very hard material.) reassemble them as you found them. Then, set the point gap at the high point of the cam. Somebody correct me if I am wrong, but I believe the setting is .020″. Now, with nothing connected to the points yet, connect an ohm meter to a point terminal and to the base plate. Turn the engine slowly by hand. On your meter, you should see the reading change between OL and LESS than 0.5 ohm. Preferably, ZERO ohms. If this is not the case, go back to something you did wrong with cleaning, reassembling and installing the points.

    The condensers will definitely be bad, unless somebody has changed them recently. I like to use whatever automotive condenser will fit in its place. I used to have a NAPA/Echlin number in my head, but not at the moment. When you have new condensers, hook them and the coils, to the points, install the flywheel, pull the engine over rapidly and check for spark. A Bendix mag is absolutely STELLAR if it will even jump a 1/4″ gap. 3/16″ is more realistic. An old spark plug can be made into a checker, by opening the gap on the plug way up. Godspeed.

    Long live American manufacturing!

    1 user thanked author for this post.

    Boonie

    Canada Member - 1 Year
    Replies: 147
    Topics: 14
    #226394

    I found some coils on http://www.oldmercs.com
    Product code 399-125.
    Can anybody have a look and see if they think they will work on a kD4 Merc with a Bendix Scintilla mag.


    Boonie

    Canada Member - 1 Year
    Replies: 147
    Topics: 14
    #226403

    They have very minimal cracking. Could be sealed very easily. Point gap is .018 stamped on the mag plate. I will take the rest of the day and clean everything up. If I can figure out how I will post some pics.
    Much appreciated


    Boonie

    Canada Member - 1 Year
    Replies: 147
    Topics: 14
    #226405

    Some pics


    Boonie

    Canada Member - 1 Year
    Replies: 147
    Topics: 14
    #226406

    Try again

    Attachments:

    dave-bernard

    US Member - 2 Years
    Replies: 1496
    Topics: 19
    #226429

    those points are available from Spruce Aircraft . last time they were about $30.00 I MAY HAVE SOME USED ONES

    • This reply was modified 11 months, 1 week ago by dave-bernard.

    Boonie

    Canada Member - 1 Year
    Replies: 147
    Topics: 14
    #226431

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

Viewing 15 posts - 1 through 15 (of 140 total)
  • You must be logged in to reply to this topic.