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Thread: 40's rear shock rebuild

  1. #1

    40's rear shock rebuild

    I've been experiencing the chain adjuster screw breaking on my Chief, each time usually lasting only a few thousand miles:


    After chasing down a few other "remedies" that didn't help I decided to finally take a look inside my rear shocks and to see what might be causing this, and I found a broken bottom spring! Not certain this caused the broken adjusters, but news springs are in order anyway.



    The rear shocks come apart like this (and while the shop manual does a good job describing the procedure, but I'm one that likes to see pictures... so here ya go!)



    You'll absolutely need a spring compressor tool, mine came from Greer's:



    And I bent up a piece of strap (actually left over from a screen door fix) to help unscrew the top spring retainer with bushing:

    Last edited by Pisten-Bully; 05-31-2019 at 08:34 AM.
    1946 Chief - take apart and put back together
    101 Scout - building stage

  2. #2

    Re: 40's rear shock rebuild

    New bushings, top and bottom even though they weren't "sloppy"



    Probably the one thing that the manual doesn't show very well is the locking ring for the top spring stop and bushing (manual refers to it as the "upper bearing"). The lock ring has a 90 degree outward bend in it that needs to be inserted through a hole in the top spring stop and into a hole in the threads, you can see the hole at about 10 o'clock here:



    when the lock ring is in place it looks like this:

    1946 Chief - take apart and put back together
    101 Scout - building stage

  3. Re: 40's rear shock rebuild

    Harry,
    Great photos and the descriptions are very helpful; thank you for taking the time to document and share with us your work.

  4. #4

    Re: 40's rear shock rebuild

    How well does the tip of the screw line up with the detent in the shock slider?

  5. #5

    Re: 40's rear shock rebuild

    Quote Originally Posted by tomfiii View Post
    How well does the tip of the screw line up with the detent in the shock slider?
    Centered well, but that’s with a stationary bike. Something causes the screw and detent hole to move against each other and break that screw....can’t see why a broken coil would do that because the slipper rod is held in bushings top and bottom, but maybe it does. I explored this last summer : http://www.caimag.com/forum/showthre...light=Adjuster
    1946 Chief - take apart and put back together
    101 Scout - building stage

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