When I work on an engine I typically take a few notes. I also do research on engines to know what I am getting into. I typed up my notes on the 227 to share with the other 227 fans and repair men. See below.
Maintenance and repair data for Prewar semi-scale and scale 0-6-0 switchers, 227, 228, 230, 231, 232, 233, and 701
E-unit OO1E-185
Coil resistance should be in a range of 7.0 to 7.6 ohms.
Idler gear, 227-42, and stub shaft, 227-31, data:
Gear, new bore 0.160”. Stub shaft, new diameter 0.156”. Nominal new clearance is 0.004”. The maximum allowable worn clearance is 0.007”.
To install new stub shaft in frame, knock old one out with pin punch from back. There is a hole in the frame opposite the back of stub shaft to accommodate this. Clean frame bore and new stub shaft with acetone. After acetone has dried, coat the bore and stub shaft with Loctite Primer SF-7649. Apply Loctite Sleeve Retainer 640 to stub shaft serrations and bore in frame. Install new shaft by taping in with hammer from outside of frame until shoulder is in contact with frame. Clean off any excess 640 immediate with acetone. Retain in place for one hour. The 640 will be fully cured in 24 hours.
Axles: plain is 227-33 and swaged is 227-41. Journal diameter is 0.180” on a new axle. The axle bushing is 227-34 with a bore of 0.185” when new. Nominal new clearance is 0.005”. Change bushings when clearance exceeds 0.015”.
Gearing. These locomotives have a double reduction gearing arrangement. The motor pinion drives a spur gear on the end of the worm shaft. The worm drives a worm wheel on the middle axle. The motor pinion, 227-87, has 9 teeth. The mating spur gear, 227-51, has 19 teeth. The worm shaft, 227-56, has a worm with three leads on it. The worm wheel, 227-32, has 21 teeth on it.
The gear ratio as calculated; 19/9 X 21/3 = 14.77:1
Worm Shaft Bearings:
The worm shaft bronze bearing, 700E-24, has a bore, new, of 0.187”. The maximum allowable oversize is 0.193”. The worm shaft thrust ball bearing, 700E-26, consist of five hardened steel balls in a cage. The balls are 5/32” in diameter. The thrust washer, 700E-184, is hardened and ground, one side only, steel. The groundside of the thrust washer shall run against the ball thrust washer. The worm shaft, 227-56, journals are 0.186” diameter and have a ground and polished surface.
Motor:
All the switcher motors are the same except for the brush plates, which very in the number of jacks. Motor 227M-1 has two jacks and is used on the 227 and 228. Motor 230M-1 has one jack and is used on 230, 231, and 701. Motor 232M-1 has three jacks and is used on 232 and 233. In 1939 brush plates were made with solid flush mounted jacks and split plugs. Starting in 1940 brush plates were made with surface mounted split jacks and solid plugs.
The armature in all motors is 700E-79. The armature shaft is 0.125” in diameter with a pair of opposing flats on the pinion end for the pinion set screw. The shaft is 2.062” long. Armature laminations are 1 ¼” in diameter. There are 14 of part SL-17 lamination blanks in the stack. Field lamination blanks are part 752M-59. The commutator is flat and is perpendicular to the shaft with three segments held in position by molded Bakelite The commutator part number is 226E-55. The drawing of this part was made on April 11, 1938, making its design just in time for the 227 family of locomotives.
Typical resistance check of the commutator produces the following results: A to B, 2.3 ohms; B to C, 2.3 ohms; C to A, 2.3 ohms. Motor running test, no load, both directions, resulted in 0.8 amps at 14 volts.
Common screw list for the Locomotive:
1) Steam chest and front coupler to frame, two, 6-32 X ½ RHMS; drive, Phillips; material, steel; finish, black. Used with #6 split lock washer.
2) Oil hole plug screw, three, 4-36 X 3/16 BHMS; drive, slotted; material, steel; finish, black. Note: this screw was found to be a 6-32 X 3/16 BHMS on one locomotive. Used with flat fiber washer 97M-15.
3) Collector insulator to frame (up from the bottom), two, 4-36 X ¼ RHMS; drive, Phillips; material, steel; finish, black.
4) Set screw for pinion gear and worm shaft spur gear, two, 227-87, 6-40 X 5/64” cup point set screw; drive, slotted; material, steel; finish, black. Note, I replace these with Unbreako recessed hex drive 6-40 X 1/8” cup point set screws. The slotted drive set screws easily split if tight to remove.
5) Body mounting screws, three, one in smoke stack and two under cab, 6-32 X ¾ FilHMS; drive, Phillips; material, steel; finish, black. These are sometimes found with #6 split lock washers.
6) Motor mounting screws, two; 6-32 X 9/16 RHMS; drive, Phillips; material, steel; finish, black. Used with #6 split lock washer.
7) Worm gear box cover to frame, four; 4-36 X ¼ RHMS; drive, Phillips; material, steel; finish, black.
8) Terminal lugs to collector assembly, two, 4-36 X 3/16 BHMS; drive, slotted; material, steel; finish, black. Used with #4 split lock washers, 56-15.
9) E-unit to worm gearbox cover, three, 2-56 X 1/8 RHMS; drive, Phillips; material, steel, finish, black.
10) Front step boards to buffer sill, two, 3-48 X 3/16 RHMS; drive, Phillips; material, steel; finish, black.
11) Valve gear support assembly, 227-81, to frame, two, 4-36 X ¼ RHMS; drive, Phillips; material, steel; finish, black.
12) Current collector to brass insert, 700E-111, two, 4-36 X ¼ RHMS; drive, Phillips; material, steel; finish, black. Used with #4 split lock washers, 56-15.
13) Boiler front to boiler, two, 4-36 X 7/16 FilHMS; drive, Phillips; material, steel; finish, black.
14) Bell bracket to top of boiler, one, 2 X 3/16 BHST type Z; drive, Phillips; material, steel; finish, black.
15) Brush plate mounting screws, four, 5-40 X 3/16 RHMS, drive, slotted; material, brass; finish, bright.
Common screw list for the Tender:
Note: Number of screws varies with type of equipment installed in the tender.
16) Shell to frame, four, 6-32 X ¼ RHMS; drive, slotted; material, steel; finish, nickel plate.
17) Back up light board bracket to frame, two, 4-36 X 3/16 BHMS; drive, slotted; material, steel; finish, black.
18) Back up light board to bracket, two, 4-40 X 5/16 RHST type F; drive, slotted; material, steel; finish, cad plate.
19) Slug relay bracket to frame, two, 4-36 X 3/16 BHMS; drive, slotted; material, steel; finish, black.
20) Bell mechanism to frame, two, 4-36 X 3/16 BHMS; drive, slotted; material, steel; finish, black.
21) Bell to bell mechanism, one, 4-36 X 3/16 BHMS; drive, slotted; material, steel; finish, black. Used with #4 split lock washers, 56-15.
22) Slug relay to relay bracket, two, 3-48 X 3/8 RHMS; drive, slotted; material, steel; finish, black. This connection is insulated and also includes black fiber shoulder washer, #3 internal tooth lock washer, and #3-48 nickel plated brass hex nut.
23) Rear step board to shell, two, 3-48 X 5/32 RHMS, drive, Phillips; material, steel; finish, black. Note: at this location a 2-56 X 1/8 RHMS, drive, Phillips; material, steel; finish, black, fastener has also been seen.
24) Coal pile to shell, two, 4-36 X 3/16 BHMS; drive, slotted; material, steel; finish, black.
25) Back up light housing to shell, two, 2-56 X 3/16 FilHMS, drive, Phillips; material, steel; finish, black.
