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Thread: Small Gas Engine Starter

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    Supporting Member gatz's Avatar
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    Small Gas Engine Starter

    It was once easy to start this Craftsman Pressure Washer engine, but now that it (and I) have a few years of use, it just gets harder to start.
    I've used the socket & extension on a drill before, but when the engine catches it overruns the drill.
    So, you gotta be quick to get the tool off the nut. Or risk unscrewing the nut.
    Even so, the last time I used a Makita drill to start the engine, it overran enough to cause some sparking in the back-end of the drill Not good.

    After giving it some thought, I had an "aha moment" and looked for a Sprag or One-way Clutch Bearing.
    This would allow torque being applied in one direction, and free wheeling for the overrunning. The Craftsman engine's recoil starter was clockwise.
    But, if it were CCW, it would only require that the Sprag Bearing be installed in the opposite way; flipped over.

    First thing was to remove the recoil (rope) starter assembly. Just 3 pop-rivets to drill out.

    Click image for larger version. 

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    Had to cut and re-weld and re-position the accessories bracket for clearance...

    Click image for larger version. 

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    The Sprag Bearing;

    Small Gas Engine Starter-csk-17pp-17x40x12-sprag-bearing.jpg


    Took a while to make the aluminum adapter...

    Click image for larger version. 

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    The 4) holes were only used to turn the alum to some stops
    with a handle, while milling the secondary or inner radii that would clear the inside of the pressed steel starting flange.
    After finishing it, it became apparent that it didn't need the inner radii at all; which would have saved alot of time as those could have been straight cuts across the sides. I'll remember that for "the next time"
    There's a roll pin (lower right of center) that the outer race is keyed to, preventing slippage.

    The round part or shaft was made for a slip fit with the Sprag Clutch Bearing with a key-way & key.


    Drilled a 3/8" hole in the opposite end of the shaft, heated it up dull red and pressed in
    a length of 3/8" hex key.

    Click image for larger version. 

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    It worked great for starting the engine.

    https://drive.google.com/file/d/17SC...ew?usp=sharing



    Anyone needing the Sprag Bearing number and source, PM me.
    This task could also be accomplished with a ratcheting 1/2 drive adapter.....but that would be too easy, right?

    gatz

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  2. The Following 7 Users Say Thank You to gatz For This Useful Post:

    allenz (Sep 1, 2021), baja (Aug 4, 2020), clydeman (Aug 9, 2020), Home-PC (Aug 4, 2020), Jon (Aug 6, 2020), Paul Jones (Aug 4, 2020), Scotsman Hosie (Aug 3, 2020)

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    Thanks gatz! We've added your Small Gas Engine Starter to our Miscellaneous category,
    as well as to your builder page: gatz's Homemade Tools. Your receipt:




  4. The Following 2 Users Say Thank You to DIYer For This Useful Post:

    allenz (Oct 23, 2021), high-side (Aug 3, 2020)

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    much safer than some of the ideas I've come up with

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    Hi Gatz...Impressive, could you send me the info on the Sprague bearing and any info on how to design the driven adapter...
    Thannks,
    Benny

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    I would like the bearing no.

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    @benny142 @allenz

    Sorry for not getting back sooner.

    The Sprag Bearing # is CSK 17PP ( 17x40x12 )
    I bought it on eBay. It came from China, but it appears to be good quality.
    @benny142
    I sent a message about the drawings



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