[Mg-mmm] PA Engine "Knock"

[Pete Thelander]

Ernie just had a similar failure on the input shaft to his supercharger. 
Used the same solution and it is working fine.

Pete
pthelander at earthlink.net



> [Original Message]
> From: Gerald Felper <felperg at earthlink.net>
> To: Daniel Shockey <magnut_dan at hotmail.com>
> Cc: MMM List <mg-mmm at autox.team.net>
> Date: 5/19/2010 1:20:46 PM
> Subject: Re: [Mg-mmm] PA Engine "Knock"
>
> 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
> _______________________________________________
>
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