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I've been PMing Johnt49 about the subject of coating varnish on alternators (I understand he's pretty experienced!) and here's what he has to say:-
QUOTE:-
"There's no hard & fast rules about using varnish. It obviously isn't going to have the insulating properties of the original applied by the manufacturer, but when in doubt or where you can see the need go ahead & use it. When I was rebuilding for resale I always used it because customers wanted to see every part had received the "re builders attention". For my own use I use my own discretion.
I usually coat alternator stators just because they are the most stressed part of the unit. Don't apply it too thick or you could have a clearance problem with the rotor & cause the windings to retain too much heat. You hardly ever see a rotor drag against the stator because the rotor runs on ball bearings instead of bushings that will wear & cause miss alignment. The stators are prone to over heat when too much is demanded of the alternator (charging dead batteries, jump starting, not replacing a weak battery, etc) Alternators are designed to maintain a fully charged battery, not be a "battery charger".
" END QUOTE!
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