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  1. #1
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    Default Recommendations for lower timken on knuck springer stem?

    I've got a springer I want to run timkens on. There's a .25" lip at the bottom. Curious what's normally done if anything in order to run a timken. Should I shave it down or just run one on top of the lip?

    Click image for larger version. 

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  2. #2
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    Usually a few taps with a small hammer, will dislodge the race for the ball bearings. As far as converting the lower stem for Timkins, I'm not sure. Years ago, I spent a couple evenings with a file trying to reduce the diameter of the stem so a Timkin would fit. I found out later I hadn't succeeded. I have thought about relieving the inside of the bearing with a Dremel and stone. If memory serves me, it is only the bottom 1/4" that needs to be enlarged.

  3. #3
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    That is a lower bearing guard, meant to center the lower bearing race on the stem. Preston part #19382 for the BT 1936-48(#48361-38).

    Remove it to install your lower tapered roller bearing cone.

    see page 20A-10 here:
    https://prestoncycle.com/ImageReposi...tion%2020A.pdf

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    That center I you see needs to be removed from stem to land timken bearing. Try boiling water, and then press on quickly with a slathering of oil.

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