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Early vs. late AF diesels open-frame motors 
(click on a photo to enlarge it, click here for a video)
The biggest difference is that later production engines have larger armatures and rubber pullmor tires. That's true of a 360 SF PA vs. a 470 SF PA (or 372 GP7 as shown here).
The bay in the latter truck is larger to accommodate the bigger windings and field.
Early cylindrical brushes top and bottom. Later square brushes in the middle.
Early non-pullmor wheels on the left. Later pullmor wheels on the right.
360 side frames on the left (no front coupler, no pick-up shoes, tow-bar connected to b-unit at the rear). 470 side frames on the right (KC's and pick-up shoes).
360 rear side frame close up with S326 screw used with tow bar. Many S326's were lost. A variety of substitute fasteners are many times found in their place today.
Smaller early field on the left. Larger later on the right. Notice the difference in end-plate orientation.
Early one-piece yoke on the left. Later two-piece yoke slipped together on the right. Notice screw vs. bolt.
Later plastic gears on the left, earlier metal gears the right.
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  • Home
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  • Contact
  • Customer Comments
  • "How-To" Gallery