[T3] Its all apart, and the verdict is in

[Jim Adney]

On 10 Jul 2020 at 23:20, Keith Park wrote:

> Crank gear is loose on the crank, no idea why that happened but the
> rattling around may have precipitated this entire thrust bearing issue
> on the cam, but the crank is worn itself where the gear is so its
> toast, now I need to get the spare turned and run with that. 

How in the world could that have happened? I assume it's a heated 
interference fit, just like on Type 1 & 3 cranks. It should never get loose, but 
once it's loose, it's bound to wear looser and looser. I wonder if that area of 
the crank had gotten scored and someone decided to polish it and took too 
much off.

Did you install it, or was this done by someone else?

Check out Abom79 on YouTube. He's a machinest who occasionally builds 
up worn seating areas on pieces like this with metal spray. I'd never suggest 
this for a bearing surface, but he's done it on shafts where cartridge bearings 
have to be pressed on. That might save this crank if the rest of it is still good.

Abom occasionally shows work he does for other people, like you, that 
makes for good videos. I suspect he still charges for this, but it beats 
throwing away a crank.

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Jim Adney, jadney at vwtype3.org
Madison, Wisconsin, USA
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