[Mg-mmm] P-Type Dynamo.

[jay at ukhistoric.com]

Back working on the dynamo.  Received the new brush set and installed
after cleaning up the unit.  I did not yet open up the unit, though.

I have a few questions on the positions and connections of the brushes:

1) Is the 3rd brush, the thin one, opposite from one of the large brushes??
2) Is the 3rd brush supposed to be connected to the field coils which is
then connected to the smaller external connection on the body?
3) One of the large brushes is connected to ground, the other is connected
to the large external connection.  Is this correct??
4) Large brushes are about 90 degrees apart.  Correct??
5) The commutator seems to be in good shape, but I have not checked
resistances between "slices".  Should I be measuring adjacent, opposite,
or others??

There does not seem to be any shorts or "opens" between connections
externally and internally.  I need to recheck resistances - one
measurement is 7 ohms, the other around 225 ohms.

I've found various docs online, but none seem to match my current internal
configuration.

Thanks!
Jason.
P1237.

> Hi all!
>
> Working on solving a dynamo problem on a P-type, PB engine.  Unit does not
> seem to be charging.  I removed the dynamo from the engine and found that
> due to oil and grime build-up, the brushes were frozen in the holders.
> While removing the small third-brush, I managed to break it.
>
> So, a few questions:
> 1) Is there a US source for a set of brushes?  Any generic part numbers I
> could even give to my local rebuild shop?
> 2) Should the unit be dismantled to clean?  Remove the crank gear?  Any
> other tricks to opening the unit?  Or just leave alone and clean the brush
> holders as best as possible?
> 3) Can the third brush be adjusted on the bench?  I needed to move it to
> remove the brush but marked the original position.  Or just follow the
> adjustment procedure once back on the car?
>
> Thanks!
> Jason.
> P1237.
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