N&W Class A 2-6-6-4 by PFM/United.
Re-motoring.
The engine was like the PRR Q-2 where it was stopping after running about 20' so checked the decoder....
Smoked it. Decoder max amps is 1.2 and the open frame motor draws around 1.26.
Small open frame motors have lower amp draw but this motor is huge. This is one of the earlier decoder installs before I knew that the amp limit was 1.2 where I thought it was 2.0 (it is for only momentary instances).
Re-motoring isn't going to be as easy as I thought as the gears to the gear box use the motor's shaft: don't think I've seen this before! If my first design change didn't work I would go to plane B: re-gear the engine.
After removing the old motor a new motor mounting plate was made out of brass stock and drilled/tapped for 4X40 screws into the frame.
Great Planes makes two nice sets of taps (standard/metric) that are made for RC airplanes.
The 4X40 screws were 1/2" long so a cut off disk removed the 'excess'.
Micro fasteners makes lots of different size screws, bolts, nuts etc: another item for RC airplanes.
Normally, screws and motors are all made 'across the pond' and use metric but the motor shaft was 3/32" diameter so I used some brass stock.
The gear that was on the motor shaft has a set screw so easy to remove from old motor. The ID of the gear was a little too narrow so a little hand filing was done to enlarge it: don't want to use power tools around nylon gears!
Assembly done and tested. A 1/8" OD tubing was used on the left side to keep the left side from moving backwards. Alas, some more mods needed.
Had to grind out some lead to make room for the new, longer shaft.
Initially, I soldered the piece of brass tubing on the left side of the gear mount but the gear box would move forward and backwards when motor was running. Some brass stock was used to secure the gear box to the frame so the gear box wouldn't shift.
Two L shaped pieces of brass were secured in front of and in back of the gear box with a piece of brass stock soldered to the two L shaped pieces. The front L piece was soldered to the 1/8" tubing.
Also, had to make sure the universal was aligned for power to the front engine set.
The back L bracket was secured to the frame with an existing screw.
The rocking of the gear box was very small but enough to allow the nylon gears to touch part of the frame.
Soldered the orange/grey wires to the motor and used decoderpro to check that all was 'good'.
Loco now in roster (DCC engines only).
Connected to mainline DCC to insure all's working properly including lights.
My last Mashima motor. They don't make them anymore.
All lights working. Two wire connector makes PM on engine, easier.
4 wire connector from boiler to frame.
New delivery:
Got some extra parts for the LCC signaling system as back up plus a few other items. Cottage industries: never assume they will exist next year!
Backup items: Tower-LCC, LCC-Buffer-USB, BOD-8 (block occupancy detector).
New items:
SCSD-8: single coil solenoid driver. Replacing the 'jack wabbit' with this to remotely throw turnouts via the schematic on the PC monitor.
I/O tester: Test board.