Elgin Outboard Impeller swap

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  • Buccaneer

    US Member - 1 Year
    Replies: 6269
    Topics: 936
    #269302

    Just wanted to show a seemingly successful Elgin impeller
    swap, replacing the original 10 vane rubber impellers (one inch plus tall)
    with two Mercury impellers stacked together.
    Slight modifications were required, such as drilling the driveshaft
    for two impeller drive pins, to drive the Merc impellers.
    The original Elgin impeller was driven by the driveshaft splines.
    The driveshaft is “very” hard drilling by the way!
    Thanks to Brian Wilcox for “tips” on doing this conversion!

    My camera was aimed a little “low”, but it appears to be pumping water
    plenty good. How it will hold up will be the real test.

    Prepare to be boarded!


    Al


    Replies: 5
    Topics: 5
    #269309

    buccaneer

    can you share the part number for the mercury impeller your using in the elgin outboard thanks AL


    seakaye12

    US Member - 2 Years
    Replies: 863
    Topics: 103
    #269310

    Some of those driveshafts are hardened steel.  Was it difficult to drill?


    bobw

    US Member - 1 Year
    Replies: 2044
    Topics: 52
    #269311

    Buc – looks like it works great.   Glad it worked out!

    Bob

    1937 Champion D2C Deluxe Lite Twin
    1954 Johnson CD-11
    1957 Evinrude Fastwin 18
    1958 Johnson QD-19
    1958 Johnson FD-12
    1959 Johnson QD-20

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


    Buccaneer

    US Member - 1 Year
    Replies: 6269
    Topics: 936
    #269313

    buccaneer

    can you share the part number for the mercury impeller your using in the elgin outboard thanks AL

    I used Mercury 47-89981 impellers.
    Sierra 18-3039

    They’re a little loose on the driveshaft, but I fit the
    drive pins tight to compensate.

    Prepare to be boarded!


    Buccaneer

    US Member - 1 Year
    Replies: 6269
    Topics: 936
    #269314

    Some of those driveshafts are hardened steel.  Was it difficult to drill?

    I spot drilled them with a machinist “center drill” on the milling machine,
    the switched to the size drill bit I wanted. I managed to drill the first
    hole to depth, about .200, but the drill wouldn’t touch the other
    hole, nor the other four bits I tried, lol.
    I ended up using the center drill to go to depth, which worked okay,
    but I had to use a larger diameter pin than I intended, which
    may have been better anyway.

    Prepare to be boarded!


    billw

    US Member - 2 Years
    Replies: 1909
    Topics: 62
    #269315

    You had mentioned that you also had ordered the Sierra equivalent of 47-89980. Did you end up feeling that they were too tight on the shaft?

    Long live American manufacturing!


    Buccaneer

    US Member - 1 Year
    Replies: 6269
    Topics: 936
    #269316

    You had mentioned that you also had ordered the Sierra equivalent of 47-89980. Did you end up feeling that they were too tight on the shaft?

    Those ended up being “bigger”.
    The 47-89981 I used had a center bore of .453
    and the 47-89980 were .457.

    Someone mentioned they had to bore the hubs ever so slightly
    to fit over the driveshaft. Not sure what make or number those
    impellers would have been.

    All the impellers I got were Chinesium, so “fit” may not be as
    good as the OEM impellers.
    When I ordered the impellers, I ordered six all together, not
    being sure if I was fixing two motors or one, or which impellers
    would work out.

    Prepare to be boarded!


    The Boat House


    Replies: 4021
    Topics: 99
    #269317



    Including the pictures you posted in projects
    might be helpful for others needing a substitute
    for their Elgin.
    Tubs
    .


    Buccaneer

    US Member - 1 Year
    Replies: 6269
    Topics: 936
    #269340



    Including the pictures you posted in projects
    might be helpful for others needing a substitute
    for their Elgin.
    Tubs
    .

    Thanks for mentioning that Tubs.

    Photos, including the impellers swap, in Current Projects…….

    1951? Elgin 7.5 hp

    Prepare to be boarded!


    Buccaneer

    US Member - 1 Year
    Replies: 6269
    Topics: 936
    #269341

    Whilst the turkey was roasting I got some more work done on the Elgin,
    and some “after” the feast…… before I feel into a coma from all the
    turkey.
    The original shift cable, or at least the one that was in the motor,
    was 1/16 braided cable, and all frayed hopelessly on the bottom end.
    The top end has a ball molded onto it, which the shift lever acts upon.

    The cable has to be fed in from the top, through the shift lever hole,
    then fed down 18″ or so, and out a 1/4″ hole in the bottom
    of the driveshaft housing, where it couples to the gearcase cable,
    via a funky clamping fixture.

    I dug around and found another cable that actually had a ball on the
    end. It was quite a bit skinnier, but plenty long. I think I saved it
    from one of the snowmobiles or 3 wheeler.
    I ran a long piece of wire up from the bottom and wrapped and taped
    it to the cable and fed it down the driveshaft housing, and out the bottom
    hole. It took a few tries, but patience finally paid off.

    It was a PITA to affix the two cables to the connector and get the slack out,
    but when tested, I now have a “neutral” that works.

    DSCN5498

    DSCN5497

    The rest of the time spent was more fun, attaching clean,
    painted parts with no problems.
    The carb is on loose for the photo op, as I still need to make a new gasket
    for it.
    Soon the dreaded gas tank body work will have to start.

    DSCN5502

    DSCN5503

    Prepare to be boarded!

    Attachments:

    billw

    US Member - 2 Years
    Replies: 1909
    Topics: 62
    #269353

    That is without a doubt, the luckiest 7.5 hp Elgin, ever! When it came off the assembly line, it had no idea that it was going to be lucky enough to end up in your shop and not the scrap pile, like the many thousands of others. I will be interested to see if you think it’s a good runner, like so many other West Bend engines were, and how it compares to a 7.5 OMC product.

    Long live American manufacturing!


    Buccaneer

    US Member - 1 Year
    Replies: 6269
    Topics: 936
    #269360

    I have a 7.5 hp Evinrude Fleetwin that I went partially though, and I thought
    it was a real dog, but perhaps it was just “worn out”.
    I see that I posted yesterdays work to my wrong thread last night……
    must have been “brain fog” , or “Thanksgiving Hangover”!…… from food that is!

    Prepare to be boarded!

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