Designation No.4
Bore 1 1/2 inch
Stroke 1 1/2 inch
Configuration Vertical single cylinder
Height 10 inches
Extra equipment Drain cocks
Displacement lubricator
Reversing gear
Taps required 2, 4, 5 BA
3/16 x 40 tpi
1/4 x 32 tpi
5/16, 3/8, 1/2 x 26 tpi
Notes Usually seen with the standard 6-spoke flywheel, although engines fitted with the balanced disc flywheel are well-suited to direct-coupled generating duties, running well at high speed.