[AT] CAT magneto

[Dave Merchant]

Cat used similar looking magnetos on many different engines,
but note that some were clockwise rotation and some were ccw.

On the D2 + D4, opposed ponies, the mag mounts on top of the pony,
while on the D6 opposed pony + the vertical ones on the D7 and up,
the mag is mounted at the end of the pony, turning opposite direction.

Parts from both rotations will fit together in the case, but won't work.

Some of these mags have a direction arrow, some don't.

Mags are one of their few weak points of Cats.
The mag shaft is very thin, with a big coarse tooth gear on it
to engage the gear train on the pony.
Over rev the pony + and the mag shaft snaps, causing gear teeth
to break + travel down thru the gear train.

I've seen Eisenman + Bosch.

Some people that just need to have the machine operable mount
a modern gas engine belted up to the flat faced pony  flywheel.

Dave Merchant


At 01:44 PM 2/15/2009, you wrote:
>Gene and Joe, thanks for your comments.
>
>  A fellow brought me the cap, rotor and points yesterday out of his grader
>to see if I could help him with some new parts. I cleaned the cap up and
>installed new brushes. The rotor is a yellowish phenolic/bakelite part that
>has a gazillion cracks in it. I told him to try a tad of Super glue to see
>if it would seal the cracks. The points were burnt but i polished them to
>work well enough. Looking at the points they resemble something by
>Faribanks. I've got a bunch of NOS Eismann stuff but it is all for big
>magnetos--and the funny thing is I have never worked on an Eismann. Of
>course Cat told the guy nothing was available--I'd hate to pay their price
>if it was!
>
>  The fellow was going to see if he could find any writing (model #) without
>taking the mag off. If he can't I just wanted to know what possibilities
>there were before I start hunting a new rotor or if he had to pull the mag
>off.
>
>John
>
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>http://www.antique-tractor.com/mailman/listinfo/at

Dave Merchant
kosh at nesys.com
nesys_com at ameritech.net
dmerchant at layerzero.com

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