Re: (ET) "Mower Motor Rebuilding"

["Steve & Sandy Naugler" <snaugler earthlink net>]

To GE and other electric item rebuilders,
    If you feel the need to seal your motors or other electric items with
silicone you must use a neutral cure silicone sealer.  The stuff you buy at
Home Depot gives off acetic acid as it cures.  (You can smell it.)  If 
given
off inside of a closed container, like our GE DC motors, it will build up 
to
a high enough concentration where you will get corrosion of exposed metals
(commutators) and/or bearings.  I damaged some automotive motors this way
before I knew there was a neutral cure in existance.
    You can order neutral cure electronic grade silicone sealer from Newark
Electronics.  I am not sure where else it is available, although Radio 
Shack
might have it as a catalog order item.
    I have rebuilt six mower motors and so far not needed to use sealers
anywhere.  I'd be interested to know if the need for silicone sealer is 
fact
or myth.

Steve Naugler

----- Original Message -----
From: "Pestka, Dennis J" <Dennis Pestka mkg com>
To: "'Elec-Trak Email Discussion List'" <elec-trak cosmos5 phy tufts edu>
Sent: Wednesday, March 22, 2000 1:38 PM
Subject: (ET) "Mower Motor Rebuilding"


> First I liked to thank Dean for the information on the Graphite paint.
>
> Secondly I have heard that after rebuilding the mower motors you should
> silicone the countersunk bolt holes in the end cap that are exposed to 
> wet
> grass/etc. to keep moisture out of the motor.
>
> Do I need to apply any kind of sealer to the end cap itself where it 
> mates
> up to the motor housing ?
>
> Thanks;
> Dennis
>