Hornby B12 motor fail, NOT AGAIN, Warning to others and apology

Hornby B12 motor fail, NOT AGAIN, Warning to others and apology.
So despite all the pre care to make sure the motor was not under any stress, this happened.
Thanks for your thoughts. At the moment the loco is undergoing tests.
I replaced the motor and that too failed but I think it was one of the ones Hornby sent me for the S15 and I fitted it by mistake.
Now its fitted with one of the Chinese ones.
It’s running much better than it did and is drawing just 100mA which is fine. I’d expect motors of this kind to draw between 50 and 150mA if all is well.
I have some suggestions for other owners that want to try and stop the motor issues.
1) Check the loco wheel pickups, mine were way too hard and causing lots of drag, ease them off so that they just keep contact when the wheel is furthest away from them.
2) Inside, see • Hornby B12 Technical f... Make sure there is clearance between the rear flywheel and the motor bearing, check that the sleeved wire from the suppressor capacitor is not fouling the back of the front flywheel. Make sure the worm tower bearings are lubricated. Make sure the motor bearings are lightly lubricated. Check in the worm tower that the grease is not too think.
My feeling is that the motors are failing as the brushes break down due to heat and short out the commutator segments. This could explain the erratic running we see.
I can’t pass on the link for the Chinese motors as they are out of stock now and have no plans for more. If I find an alternate supplier I’ll let everyone know.
Take care. Mike
2mm shaft
35.8mm body
6mm dual shaft
16.6mm biggest width.
12.6mm narrowest width.
12V-24V-High-Speed-Micro-NdFeB-Strong-Magnetic-Mini-130-Motor-DIY-RC-Car-Boat
#modelrailways #modelrailroad #modeltrains