mercury KD3

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  • JEFFREY PLITT

    US Member - 1 Year
    Replies: 15
    Topics: 19
    #239460

    hey guys . need help again . working on the kd3 . i seem to have oil coming up the drive shaft lower seal in the gear case . only when the motor is running . prop shaft seal ok . upon disassembly there appears to be no seal there , just a brass bushing . any ideas ? thanks in advance


    green-thumbs

    US Member - 2 Years
    Replies: 466
    Topics: 38
    #239466

    There should be a “bushing” , a spring, and a seal present.
    Original seal was a bit of raw hid, A replacement can be made
    from a scrap of leather. If the drive shaft is pitted and rough in the
    area the seal contacts, seal will leak and wear. so regular replacement
    may be expected.

    NOTE: only one end of drive shaft is ground to fit gear case bushing and area where seal rides. Drive shafts vary in length. If you need to
    find a replacement be sure to check lengths.
    Louis

    • This reply was modified 1 week, 3 days ago by green-thumbs.
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    opposedtwin

    US Member - 2 Years
    Replies: 824
    Topics: 235
    #239487

    Jeffrey,
    There have been a number of good threads this spring regarding K and KD models. Here’s one that covered ALOT of ground.

    Keep in mind the singles used different gears in the gear case than did the 2 cyl models.

    Good luck and keep us posted on your efforts/findings. Pictures are always interesting and are a great conversation starter.

    Scott

    Mercury KD4


    JEFFREY PLITT

    US Member - 1 Year
    Replies: 15
    Topics: 19
    #239492

    HEY GREEN THUMBS . after disassembly i have just a lip seal in the upper half . no spring or bushing . got a seal and gasket kit from the merc guy but none of the seals match what came out . also , this is a single cly KD3 .


    green-thumbs

    US Member - 2 Years
    Replies: 466
    Topics: 38
    #239505

    “Bushing”, spring and raw hide seal system is original factory set up.
    A metal case lip seal can be instead and would not require additional
    items. Seal can be selected from a seal catalog using shaft diameter, seal thickness and diameter of bore it is to be installed in. ‘
    Careful measurement is required.
    I have noticed that while the ground area of drive shaft seems to be a
    consistent 0.495″ the shaft size varies. As with all OLD machinery, wear,
    corrosion and other factors may be more in some than in others. No two examples will have exactly same issues. Each is a mystery to be
    explored and issues found and resolved.
    Louis.
    bb
    Allow me to back off on spacer,/bushing, spring and raw hide seal…Kiekhaefer and those who serviced motors tried a number of different methods to keep grease in and water out. By the looks of things
    none were fully successful.
    Louis

    • This reply was modified 3 days, 9 hours ago by green-thumbs.

    JEFFREY PLITT

    US Member - 1 Year
    Replies: 15
    Topics: 19
    #239508

    thanks you louis


    fifty20ne

    US Member - 1 Year
    Replies: 393
    Topics: 103
    #239748

    Some Mercury Factory Training Charts showing springs and seals.

    Chart7

    Chart8

    comet8

    comet9

    Attachments:

    billw

    US Member - 2 Years
    Replies: 1483
    Topics: 45
    #239759

    I like #58, “drive shaft cork water seal….4 for 12 cents.” But I don’t see where there is a spring for the drive shaft seals, even though I think I have seen them in actual lower units. What am I missing?

    Long live American manufacturing!


    JEFFREY PLITT

    US Member - 1 Year
    Replies: 15
    Topics: 19
    #239800

    SO I SEE THE CHART WITH THE SPRINGS AND BUSHINGS . I HAVE A KD3 . CHART IS FOR A KD4 . IT SEEMS TO HAVE MORE PARTS . MY KD3 HAD A LIP SEAL WHERE THE DRIVE SHAFT ENTERS THE GEAR CASE . MEASURES 130 MM INNER AND 180 MM OUTER .


    opposedtwin

    US Member - 2 Years
    Replies: 824
    Topics: 235
    #239840

    Look closely at the two types of drive shaft seal set ups in the lower right of each drawing. The old style with a spacer and 3 cork seals was replaced by the new style using a spring, a spacer and a modern lip seal.

    0869964D-D67E-44BF-AD35-DEB1E26EC781

    DB89A348-0B1A-4AB9-99CE-10C6BC631EDA

    • This reply was modified 4 days, 23 hours ago by opposedtwin.
    • This reply was modified 4 days, 23 hours ago by opposedtwin.
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    opposedtwin

    US Member - 2 Years
    Replies: 824
    Topics: 235
    #239861

    The kd3 and kd4 have the same gear case except for the gears. Most (but definitely not all) of the kd3s and kd4s out there were updates with the spring and lip seal. Many also had a rotex type impeller installed to replace the oscillator “hockey puck” type impeller.


    JEFFREY PLITT

    US Member - 1 Year
    Replies: 15
    Topics: 19
    #239896

    OK . THANKS OPPOSED TWIN . NOW ITS CRYSTAL CLEAR . I HAD THE LIP SEAL BUT NO SPRING OR BUSHING . ANY IDEAS AS TO WHERE TO GET THOSE MISSING PARTS


    opposedtwin

    US Member - 2 Years
    Replies: 824
    Topics: 235
    #239900

    Try this guy. He’s the SIG leader for mercurys and has helped many of us out over the years with parts, advice, etc

    F5B2FE7B-E3E1-4409-8A65-56E4119F5785

    • This reply was modified 4 days, 6 hours ago by opposedtwin.
    • This reply was modified 4 days, 6 hours ago by opposedtwin.
    • This reply was modified 4 days, 6 hours ago by opposedtwin.
    • This reply was modified 4 days, 6 hours ago by opposedtwin.
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