[Mg-mmm] PA Engine "Knock"

[Gerald Felper]

Daniel
I had a Dyno shaft break just above the commutator. I had a new shaft  
made which screwed into the old shaft with left handed threads. I made  
it out of SS. It worked fine for many 1000 miles.
Jerry

On May 19, 2010, at 8:45 AM, Daniel Shockey wrote:

> Hello,
>
> I finally got back to work on the PA. Upon a little dis-assembly the  
> problem
> was obvious. John Z. was right with his diagnosis. The woodruff key  
> was worn
> away at the top of the generator. The gear would twist easily  
> through about 25
> degrees. That's a lot of cam timing variance! There is wear from the  
> dynamo
> top fork working back and forth so it is a loose fit now on the  
> dynamo shaft.
> It appears that it is an old problem with this dynamo. Someone tried  
> to pin
> the nut to stay tight with a punch. The keyway on the generator  
> shaft is
> hogged out to one side. I ordered new parts and will have to get a  
> new keyway
> cut. I suppose it would be a good time to consider a new 2-brush  
> dynamo. Valve
> timing is rather important and there must be a lot of force on this
> component.
>
> This was easily diagnosed and (will be) readily fixed. I am much  
> relieved and
> grateful to the advise of the other owners.
>
> Thanks,
>
> Dan Shockey
> PA2108
> Wyoming, IL
>
>
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Gerald Felper
Felper Engineering
felperg at earthlink.net