The Allen diesel engine is one of four originally installed at Kew Bridge. The engines were installed to meet extra demand during the summer months and, along with electrical pumps, to replace the steam engines when they retired during the 1940s.

Date of manufacture 1935
Cylinder Diameter 13.5 inches (350 mm)
Stroke 18.5 inches (470 mm)
Water output per minute 1000 Gallons (4546 litres)
Water output per 24 hours 1.4 M Gallons (6.3 M litres)
Revolutions per minute 333
Last worked 1985
Restored to work 1986

Our engine is a three cylinder, 4-stroke engine, coupled to a centrifugal pump. It has many feaures in common with more modern diesel engines, including a fully enclosed crankcase, but still has an external flywheel.