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Thread: '53 Seat Post Bushings

  1. #1
    Join Date
    Jun 2011
    Posts
    18

    Default '53 Seat Post Bushings

    I installed the Croft Seat Springs and everything stacked up like it was supposed to; thanks for the tip.

    The clearance between the seat post and the seat post bushing seems excessive at 1/16".
    • the seat post OD is 1.183
    • the bushing ID is 1.248
    • the OD of the bushing is approximately 1-7/16
    • just to have full disclosure, there is not a hole in the bushing at the grease zerk.


    Any ideas what the clearance should be between the seat post and the seat post bushing. I expect that I will be removing the existing bushing and turning up a custom bushing.

  2. #2
    Join Date
    Mar 2009
    Posts
    539

    Default

    Offhand, I'd say .020" -.030" at the most. Sometimes they even need some mild reaming for proper clearance. Just enough clearance to provide free movement without binding.
    You didn't say if you replaced the bushing or not, did you? They wear out, it would be good to replace it with a new one. Colony makes a good one. The bushing will have a groove around the OD of it that aligns with the grease zerk. There are two holes in the groove, 180 degrees from each other. When installing the bushing, these holes go to the sides of the seat post tube, NOT to the front and the rear. When grease is applied, it is forced though the groove, around the sides and through those holes, thereby greasing both sides of the plunger.
    I know that this is basic common sense and everyone here knows it, but I only mention it because I have seen so many of them installed incorrectly, with the holes fore and aft.
    Last edited by Rooster; 10-21-2017 at 01:17 AM.

  3. #3
    Join Date
    Jun 2011
    Posts
    18

    Default

    Thanks for confirming the clearance is excessive

    I have not changed the bushing (yet)

    After further inspection
    - there are two holes (near) 3:00 and 9:00
    - the bushing ID is 1.248 at 3:00/9:00 and 1.236 at 12:00/6:00

  4. #4
    Join Date
    Jun 2001
    Location
    Central Illinois, USA
    Posts
    3,301

    Default

    SSantelman!

    Since reamers are expensive, and cannot be piloted for this application anyway, I suggest making your bushing just a couple of thou over the seatpost diameter, and then using a machinist's scraper to achieve clearance.

    ....Cotten
    Attached Images Attached Images
    Last edited by T. Cotten; 10-21-2017 at 04:19 PM.
    AMCA #776
    Dumpster Diver's Motto: Seek,... and Ye Shall Find!

  5. #5
    Join Date
    Mar 2009
    Posts
    539

    Default

    It's not the Space Shuttle....

  6. #6
    Join Date
    Jun 2001
    Location
    Central Illinois, USA
    Posts
    3,301

    Default

    Quote Originally Posted by Rooster View Post
    It's not the Space Shuttle....
    Of course it isn't!

    Its the flying machinist's scraper.

    ....Cotten
    PS: Low-tech rules, while "experts" drool...
    Last edited by T. Cotten; 10-22-2017 at 02:52 PM.
    AMCA #776
    Dumpster Diver's Motto: Seek,... and Ye Shall Find!

  7. #7

    Default

    Is this a Harley frame?

  8. #8
    Join Date
    Jun 2011
    Posts
    18

    Default

    To the best information I have, it is a HD frame.

    I had the frame blue printed by an old boy who had a frame straightening jig in exchange for some gun smithing. He reported back that it was one of the straighter HD frames he had worked on and all the tabs were present; he did not recommend any work be done on the frame.

  9. #9
    Join Date
    Mar 2005
    Location
    Huntington, New York - American Zone
    Posts
    746

    Default

    ssantleman,
    I've been looking for a frame for my 1953 FLE for quite a while. Wouuld you have a source?
    Thanks
    Bill Pedalino
    Huntington, New York
    AMCA 6755

  10. #10
    Join Date
    Jun 2011
    Posts
    18

    Default

    Unfortunately I do not know of any available frames.

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