I just completed a gear upgrade of a old lionel MPC GP9. I need to gauge the wheels and do not have another engine to reference against.
Does anyone know the proper distance? Measured forinnner rim or end to end of wheel. How is it done?
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From the Lionel Service Manual:
When mounting wheels be careful to maintain the original distance between the wheel flanges. The precise distance depends on the length of the locomotive and varies from 1.265" in "scout" locomotives to 1.235" in 773 hudsons.
Folks brought me a lot of locos to rebuild they "disassembled" as kids. I'd generally set the wheels around 1.24" and there generally weren't any problems.
It's best to measure the spacing with a set of calipers before disassembly, then you'll know where to put them back when it's done.
I usually put the loco on a piece of track and set the wheels close to the rails, but not too close.
You can also use a fast angle wheel and axle set as a comparison gauge.
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