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How To Replace Cogs Without Damaging Loco
Owen asks readers:
“Hi I have a loco (b12 4-6-0) that I need to replace a cog in and I can’t do that without taking off the rods that connect to the wheels and I don’t know how to take them off and put them back in without damaging it. Any help would be greatly appreciated.”
SUBMIT YOUR QUESTION
You don’t say which model. On the older Hornby B12 the centre whel has a screw which holds the rod on. I guess this is not the one you have. The real problem is getting the “Quartering” right when putting the wheels back on. If the coupling rod hole in the left wheel is not exactly 90 degrees to the hole in the right wheel the loco will not run smoothly. Check very carefully and try to mark the whels so you can get them back on in exactly the same place as they came off.
I have changed the cog on a lot of old Hornby B12 chassis, I put washers each side of the gear to centralise it in the chassis which controls “end float” on the axle and stops the loco “Crabbing” along the track On my more recent attempts I used an old brass gear from a “Triang” Jinty loco and a single start worm either Hornby Dublo or Romford to improve slow running but the worm is bigger so I make the slot in the chassis wider using a hack saw.
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i use code 83 on my o-N30 layout