I'm hoping someone out there remembers the Athearn "Little Monster"0-4-2T from the 1960's.
After several months detailing, painting, etc. et. al., everything was fine. Until one day I heard a horrible noise. . .one of the crank pins had come loose, and dropped the rods.
For whatever reason, after that the engine would occasionally bind up.
I've tracked one problem down to a bent crank pin. .. and just got some crank pins in from Bowser.
Replaced the bent one, and it's running much better, but still getting an occasional bind.
Before finding the bent crank pin, I made sure the frames and rods were all free from burrs, checked the worn gear and the axle gear for defects, and cleaned up a few rough edges.
Is it possible that the gearbox shifting/rotating could cause the universal coupling to jam? Could improper quartering cause an intermittant issue, or would that cause a constant issue?
I'm wondering if the gearbox is supposed to be held stable by a brace or what not (it wants to rotate on the axle axis, since the universal allows some room for this). As I got this (extremely) used, I'm not sure if it would have had some kind of brace.
If so, I noticed NWSL has a gearbox kit for the old 0-6-0 - I'm guessing it'd be pretty close - they mention the rotation issue, but say just to make the worm shaft as long as possible.. .no mention of bracing the gearbox.
Anyway, I'm obviously new to dealing with gearing/rods/ quartering. . .so any thoughts would be very welcome.