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We removed the cowl flap motor (after determining the linkage was free, etc.). It was sick on the bench as well. We disasembled it, and found it full of crap (probably from washing down the engine, possibly from spilled oil during oil change). After cleaning, the motor ran normally. We reinstalled it, and everything works great now. Both front and rear cowl flaps close and open in the same amount of time.
Along the way, I learned that Owen Bell (Aviation Enterprises, see Web Sites list on this site) has serviceable used motors for $995 exchange (no warranty) or new (approved, PMA) motors with warranty for $1195 exchange.
We put some high temp RTV around the wires going into the motor to help prevent this from happening again.
Bob, your comment about overrun and full 28V only applies to the rear cowl flap motor, correct? The only risk on the front is that it might suck the flap in a bit too far on close, and open a bit too much on open, correct? The rear actually closes against metal, and if it is adjusted incorrectly, the motor will labor too hard against the hard stop. If the rear opens too far, and the flaps are put down, the damage could be an RBT (really bad thing).
Kevin
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