It sounds to me like an overspeed. One or more of the individual commutator segments has broken free of the bonding. Although it may be possible to rewind the motor, a replacement may be the less expensive/most reliable route. If only the commutator is damaged (one or two bars lifted under the brushes) you may be able to get by with turning the commutator and strengthening with Kevlar tape. Best to check with a competent and local motor shop.
Tom Keenan > On Mar 4, 2015, at 8:33 AM, Ted Lowe, FVEAA via EV <ev@lists.evdl.org> wrote: > > Hi EVers, > > i have a 1992 S-10 conversion i've been driving for 14 years. It has an ADC > FB1-4001A 9" motor. > > Last year i made a mistake and over-spun the motor with the clutch activated. > The motor made a big nasty mechanical sound and i thought i would be walking > home from there. But the motor still works as long as i keep the RPMs down > (perhaps below 2000). If i go above that RPM, the banging sound happen > again. i realize i'm driving 'on borrowed time' and want to get the motor > fixed/rebuilt. > > So my questions are: > > 1) What is likely damaged inside? > 2) What would be involved in getting it repaired? > 3) What kind of parts and costs are likely involved? > 4) Can this be a DIY project for a handy person? > > Thank you! > > Kind regards, > ted > > > > _______________________________________________ > UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub > http://lists.evdl.org/listinfo.cgi/ev-evdl.org > For EV drag racing discussion, please use NEDRA > (http://groups.yahoo.com/group/NEDRA) > _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org For EV drag racing discussion, please use NEDRA (http://groups.yahoo.com/group/NEDRA)
