[Mg-mmm] PA Engine "Knock"

[Chris Bucknell]

Gerald,

That is most interesting.  I had a dynamo shaft break in the top bearing a
couple of years ago.  When I asked everyone no one had ever heard of it
happening.  Looks like it is more common than everyone thought.

The fix for mine was to machine the shaft end flat and tap a hole into it
and make a new end piece with a male thread on it and screw it in.  All good
so far although fair to say not done 1000 miles, but it is a supercharged
engine  Obviously need to get the thread the right way around so id doesn't
undo. Can't remember whether it was left hand or right hand thread.

Regards,

Chris

-----Original Message-----
From: mg-mmm-bounces at autox.team.net [mailto:mg-mmm-bounces at autox.team.net]
On Behalf Of Gerald Felper
Sent: Thursday, 20 May 2010 5:01 AM
To: Daniel Shockey
Cc: MMM List
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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