Replacing MPC armatures with postwar armatures

[ADCX Rob]

The rectifier was in the video.  The OP wants to know about a U-36B which does have the 600 series motor.

[cwburfle]

The MPC rectifier electrics used a different armature than the 600 series armature that ADCX Rob referenced.
It is unclear to me what would need to be changed to put a postwar armature in one of those motors.

Regardless, as Rob also indicated, there is no reason to replace the armature unless it fails.
I do run across motors with bad armatures from time to time, but it is not a common problem.

[ADCX Rob]

That's what I had to do.

[overall]

So, I would need to replace both the armature and the brush plate. Right?

George

[ADCX Rob]

Unless you are running a display layout, I don't think the MTBF difference would be noticeable, if at all.

I have swapped both ways in locos similar to yours, using early 600 series parts(that MPC reverted to, fortunately, in 1970).

621 on the left,  8770 on the right.  The brush plate has to match the armature due to a slight difference in diameter of the shafts.  The lower machined gear portion appears to be the same.

[overall]

In a DVD called Lionel Nation 7, the producers assert that you can replace an MPC armature with a postwar armature and they demonstrate this be replacing the armature in an MPC era rectifier locomotive. The benefit of doing this is that the postwar armatures are more durable than their MPC counterparts. Also, the MPC locomotives are less expensive than postwar. Replacing the armature will make the MPC engine last longer. I was wondering if any of you had tried this conversion with an MPC U36b diesel. If you did, how did it work out for you?

Thanks,

George