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Reply to "Early vs. Late Production AF Diesel Motors - PA and GP"

CW  -- your 360 and 370 both use the same earlier production armature (XA11445) with smaller winding segments and matching truck.  I am not certain if they came with factory bushings because I'm not exactly sure when they stopped putting them in.  The 360 that came in the 362 AB combination had truck XA11463-RP.  The 360 in the 365 combination and the 370 used truck XA12B065-RP, but I don't know for certain if that one always had bushings or not.  Chances are it does.  Most pre-pullmor small motor diesels that I work on have them.  But if there's one thing I've learned about Gilbert production - refrain from saying always or never.  There were transition periods when all sorts of combinations and the resourceful use of whatever was around at the factory got used, shipped, and sold.  You can check by dropping the side frames and looking at the inner wall where the axles pass through the truck.  You'll see a bushing of different metal than the rest of the truck if they're in there.   Sorry I can't be more definite than that.  I'm a much better S-gauge technician than I am historian.

Stew - early diesel yokes (your photo on the left) were one piece and required you to remove the body/shell, unsolder the connection at the top of the the yoke, and remove either a tiny cotter pin (early production) or lock-ring in order to lower the motor assembly from the frame.  The later production yokes are two pieces.  The inner yoke is screwed to the truck like the early one piece yoke and has recessed field centering screws.  The outer yoke (your photo on the right) is basically a sleeve that slips over the inner yoke with holes near the bottom that slip over the screws that hold the inner yoke to the truck.  That's so you can drop the motor out without taking off the shell, un-soldering the connection at the top, or removing a pin or lock ring.  

Hope that helps.  Thanks.  

Last edited by Sgaugian

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