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:
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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.
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Next was the second crank that didn't clear the chain guard (zoom in and you will see the outline of the good crank
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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:
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I pull out a 4th crank and ding ding...I found a winner. It had the same profile as the good crank.
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And it clears the guard...yay!!!!
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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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