Originally Posted by PowerSource
Are you just swapping out a complete RDM unit with motors or are you rebuiding the motors and RDM?
Finally, I got everything out of my car, and as you and Fabulist was thinking, the problem is due to erosion of the splines of the traction motors. Of course the male part of the spline in the RDM is also affected.
Regarding the motors, I think I can rebuilt it. We just have to remove the splines and replace by new one. However, I read many post on hard and soft spline. To what I understand, Soft spline are related to soft steel, and hard to tempered steel. Many noticed that soft and hard splines failed, which is normal. Tempered steel does not have higher torsion and shear resistance: it is just harder in terms of hardness. It is then probably less susceptible to erosion, but it will shear if the torque is too high.
I would like to know if some of you succeed to rebuit the RDM and the motors and/or if some of you have something to offer. In terms of splines, the best is to rebuilt with duplex stainless steel alloy (17-4PH) this alloy is about 3 times more resistant for torsion. This what I intend to do with the motor. However, for the RDM, if someone has stuff to propose, I would like to hear about. Rebuilding it might be more complex.