General view of Triang (R150) B12 locomotive and tender. (Note. Missing its whistle.
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Rear view of locomotive shewing body fixing screw (in rear face of footplate "valance".) in line with tender drawbar pin. (Note: If this screw is overtightened, the body may split arounfd the screw hole.)
To remove body, first remove this screw. Then, carefully lift the cab end clear of the motor, and carefully pull the body backwards so that the chassis extension comes out of the slot in the front of the body in front of and under the smokebox.
Front View of locomotive showing chassis extension in place through slot in body.
View of motor and smoke unit, factory installed version. (Note the smoke unit is painted black. This is standard factory finish, as the unit can be seen.)
I have not yet seen a non smoke fitted version, either in the "flesh", or as a diagram, but I would guess that a weight is fitted in place of the smoke unit (That is certainly the case with "non smoke" Panniers (R.041).)
If this is the same, then the weight is held on with a screw that uses the same tapped hole as the smoke unit. (Unfortunately, the weight screw is not the same length as the Smoke unit screw.)
So, it should be a process of removing the weight, Taking the lid off the smoke unit. Carefully removing the smoke element (looks a little like a fuse). Carefully digging out the wadding. (If screw is in unit, good. Otherwise you need a screw, as in the "exploded" photo.)
It is easier if the screw is placed through the hole in the bottom of the unit, and then the unit is offered into position, with a small screwdriver holding the screw in the hole. Just start the screw into the thread, and then carefully mate the gear wheel onto the worm, turning the motor armature a little if neccessary to line it up. Then finish tightening the screw.
(If possible, test that the loco still runs, that the smoke unit gear wheel runs freely and doesn't jam the worm.)
Replace the wadding, element, and lid.
Attatch the feed wire to the positive brush tag.
Add smoke oil to reservoir.
Test loco and smoke unit.
If all is well, carefully refit body, taking care not to snag any wires.
Refit body securing screw.
Put the kettle on, and have a deserved cuppa.
"Left" side...
"Right" side...
Closer view of motor and smoke unit...
"Exploded" standard smoke unit, shewing "standard" lid and special "B12" lid. (Pannier tank locomotive uses a similar lid to the "B12", but the "pipe" extension is not as long.) The tapped hole in the side of the unit is for the body fixing screw in the Pannier tank and "Jinty" tank applications.
A longer unit was used in the 4-6-2 "Pacific" chassis, e.g. Princess and Transcontinental locos.
The element in this case is the "knackered" version, missing the wire!