Just finished totally rebuilding a '46 671. Completely rebuilt drive train including cleaning and lubricating all gears . Everything else also ismclean and lubricated. Engine runs quietly and smoothly in forward. In reverse however there is noise like something is not lubricated. Can't figure out whats casing it See videos forward running and in then reverse running
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Possible problem.
The armature moves back and forth based on the direction the engine is moving. Refer to diagram below from Olsen's CD.
In one direction, Direction A, the armature moves in the direction indicated by the red arrow, and depends on the Thrust Washer for smooth operation. In the other direction, Direction B, the armature moves in the direction indicated by the green arrow, and depends on the Brushes for smooth operation. Sorry, but I can not relate Direction A and Direction B with engine direction of travel.
So my first thoughts are that the Thrust Washer is missing or need to get some Lube, OR the brushes are not adjusted properly.
Hope this helps and I am not putting you on a wild goose chase!
Ok Sounds interesting. So I'll break it down and check everything. I thought when I finished with the chassis rebuild , that it was all good. Obviously not. Thanks for your excellent explanation
The armature does not move back and forth on the 1946 version, but the shaft with the 2 worms does. Check this shaft out for back and forth motion.
Well I removed the shell and rant watching the drive shaft In forward very little movement. I reverse more movement and the noise emanates clearly If it's the trust washer, what's involved in fixing it?
I believe I've lubricated everything well
I took everthing down to drive shaft and gears and ran it up on my test track. So as I was watching I noticed motor base moving a little. Well would you know it when held it down, the noise stop because the gears weren't fully engaging and were chirping along when in reverse. Both screws weren't down all the way Once I tighten them fully all that bad noise stopped. I obviously was somewhat careless when I was reassembling that component Lesson learned!!
@Bob is cool! posted:I took everthing down to drive shaft and gears and ran it up on my test track. So as I was watching I noticed motor base moving a little. Well would you know it when held it down, the noise stop because the gears weren't fully engaging and were chirping along when in reverse. Both screws weren't down all the way Once I tighten them fully all that bad noise stopped. I obviously was somewhat careless when I was reassembling that component Lesson learned!!
Huzzah! Good work! 
Mitch
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