| Description of Parts |
| Clack Valve |
A hinged or ball valve that that lets water flow one-way into the boiler. |
| Crosshead |
The link between the piston rod and the connecting rod. Also keeps the piston rod in line. |
| Flywheel |
Fitted to the crankshaft and is generally quite heavy, it keeps the engine turning over quite smoothly. Often it has a wide rim to take a driving belt which would power attached equipment. |
| Main Driving Pin |
These connect the rear wheels to the axle. The drive to these wheels is removed if the pins are withdrawn enabling the axle to be used as a winch if fitted with a winding drum. |
| Perch Bracket |
Fitted to the smoke box and carries the front axle. |
| Regulator Lever |
This controls the amount of steam allowed into the cylinder and so the speed of the engine. It is operated by a lever at the drivers position. |
| Reversing Lever |
The setting of this determines the position in which the steam enters the cylinder so that the engine can be driven forwards or in reverse. |
| Safety Valve |
Usually fitted to the top of the cylinder block. It is pre-set to a safe working pressure for that engine. Should that pressure be exceeded it will operate and allow the excess steam to escape. |
| Spuds |
These can be fitted to the rear wheels of an engine to give it extra grip in the mud. |
Steering Wheel
Steering Chain |
Uses the worm-and-wheel gearing system of a threaded shaft (worm) and a cogged wheel that mesh into it, to control the steering chains which are connected to the front wheel axle. |
| Water Pocket |
Inlet used to fill the engines water tender (tank). |