Loose front bearing slot on Neu motor

[The Dan]

Originally Posted by othello

I had the same issue with my Neu 1515. Reason beeing a crappy motor mount. If you can push the rear of your motor somewhat to the side with your fingers while beeing mounted than chances are good that due to shocks while driving the motor shaft changes alignment to the spur and the pinion is pressed against the spur which over time results in a gap where the front bearing sits.

Did you have to change the spur and/or pinion oftenly due to wear? Did your pinion often came loose? Those are signs that the motor is able to flex when mounted.

A stronger motor mount remedies those issues. Maybe you are able to support the rear of your motor too.

I changed the front bearing, wrapped the new one with alu foil and glued it back into the can. Doesn't sound like a new one and i can feel some slight vibrations (rotor has some scratches from dust and is not perfectly balanced any more) but it still does its job.

The motor is a Q-can design, with the mounts machined into the can to anchor it to the chassis. I always ran it in vehicles converted with Tekno kits, so it was always ran with the four screws holding it very solidly to the chassis plate. Those vehicles included a Losi 8ight, 8ight-T, and Associated RC8. But the thing is, Tekno thought of the chassis flex/motor mesh problem when they were designing the kits, because they all included very rigid center-diff braces that span the gap between the CD and the motor mounts. There is no flex whatsoever between that gap. Maybe it's just the nature of having to span the gap in the first place... it is a distance of about 2cm from the front of the motor to the spur, to allow the use of their clutch system. I always ran long-shank pinions though.

[The Dan]

Just for the record, I'd like to end this thread by saying that the motor was officially dead.

My friend took it apart and inspected the windings, and found a deep-rooted kink in a wire. He can't fix it, the motor's trash.

Time for a MMM!