Re-gear and re-motor an engine:
This is the Tenshodo UP 4-6-6-4 challenger made in 1973. Starting around 1974, Tenshodo started to use a quiet gear set and, usually, can motors.
The original noisy gear set and open frame motor are replaced with Tenshodo's proprietary quiet drive and a can motor.
Original gear and motor.
Back gear set.
The silver tower gear set was replaced with the brass universal support. The screws holding the old tower gear set are the same dimensions for the brass support.
Next, the driver gears need to be replaced. The two hex pins securing the side rods to the geared driver are removed. Then the driver retaining plate is removed so the geared driver can be removed.
For quartering the drivers (all drivers are 90 degrees offset from the other side where the side rods meet: done so engine cannot, sometimes, be at a position where drivers will not move), I just scratch an X mark across the driver and axle for easy relocation.
NWSL wheel puller used to remove one driver and the old gear.
Old gear and new (white nylon). New gear is 48:1 gear ratio. The axle is, normally, knurled in the center to secure the gear. If not, I use some dikes to put some indentations where the gear will be located. Tenshodo puts a 'shoulder' on the end of the axle so perfect gauging when gear wheel is put back on the axle.
Wheel pulling used to put gear back at the center of the axle (knurled part).
Wheel set reassembled.
After all parts are reassembled, push drivers on track to insure no binding. One side is insulated so insure the insulated driver is on the correct side when reassembling.
After 40 years, my real wood ties have weathered nicely!
Just about all brass engine's drivers are sprung. the springs sit loose in the journals so don't loose them. Tenshodo puts some brass centering 'springs' on each side of the frame to center the gear box.
Old draw bar replaced with a 'scissors' draw bar: just push tender forward and they connect.
Front set of drivers were done and universals added. Presently, just have the motor taped to the frame to test the mechanism.
