What is going on here?

Discussion in 'All Things Schwinn' started by ballooney, Dec 17, 2017.

  1. #21 Posted Dec 17, 2017

    Wore out three sets of tires already!

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    Goodnight then. I might get another 1/16 out of th. Is but its OK and cran. k doesn't wobble this pic and other not only shows crank is square with frame but that rear fender is not fitting. Good luck

    uploadfromtaptalk1513565829171.jpg

    uploadfromtaptalk1513565992515.jpg
     
  2. #22 Posted Dec 20, 2017

    Finally riding a big boys bike

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    Problem solved but it wasn't quite what I thought it would be. After the frame was proven to be in alignment, I ended up pulling the crank off another B6 and installed to see if there was more clearance...yes there was and it cleared the chain guard too! Sweet. What was different about this crank? I noticed the crank in question was missing this washer:
    371a5d7f775ce4aa855ac7cf791c5d7e.jpg

    Problem solved right? I found another washer, installed it and...crank still didn't clear the chain guard. What? This is strange...I pulled the chainring off of both cranks to compare the good to the bad. Here is the good crank against a straight edge. I marked around the crank keg with pencil onto the bench top for reference.
    616d295e4df66198d1c96e9af5cdedfb.jpg

    Next was the second crank that didn't clear the chain guard (zoom in and you will see the outline of the good crank):
    a99a5bad454642ac839514b310feda82.jpg
    It turns out that this crank was bent too? That seems improbable so I dig up a third crank and it doesn't match the good crank either:
    90fe16490d7612e907afd3c497bbfaad.jpg

    I pull out a 4th crank and ding ding...I found a winner. It had the same profile as the good crank.
    ecf8fc4ff37fb17e7be6a54f9aee7766.jpg
    And it clears the guard...yay!!!!
    8bf0e596c91b949f5a27c3823a33f640.jpg

    So what's the story? Did two bent cranks send me down a rabbit hole? Seems like it. Are the cranks used on B6 different than other post war models?


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    Oilit likes this.
  3. #23 Posted Dec 20, 2017

    Riding a '38 Autocycle Deluxe

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    Glad you got it all figured out. The crank that's bent looks like the bend starts at the beginning of drive side threading. How does someone bend a crank like that?
    My middleweight cranks look to be identical to those other than the cast markings.
     
    rollfaster likes this.
  4. #24 Posted Dec 20, 2017

    I live for the CABE

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    Would a washer before tightening lock nut to the sprocket shift the cranks just enough ?
     
  5. #25 Posted Dec 21, 2017

    Finally riding a big boys bike

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    Great information! Thanks for posting!