During the war sentinel manufacture over 11,000 Bren gun, Lloyd and universal carriers, hundreds of Herbert turret lathes, also thousands of 94 mm and 114 mm shell casings and many more war time items. They also repaired American built Atlas, Buda, Caterpillar, Cummins, Fairbanks Morse and Waukesha diesel and petrol engines.
Stephen Alley again sold all his shares, this time to Metal Industries ltd, who had the capital to expand the factory.
Sentinel recommence production of 100 hp single-engined locos (No 9363) with a new shape.
Both Sentinel-Doble lorries believed scrapped.
The new Sentinel 7-8 ton 4 wheel,4 cylinder, 5.78 litre Diesel lorry introduced (4/4DV). Sentinel were relatively late developers of the oil engine lorries compared to their rivals who had already moved from steam powered wagons some years earlier.
A 40 seater bus with Beadle body was produced with 4/4DV chassis.
A six-cylinder, 9.12 litre, Diesel lorry designed to tow a trailer was launched called the 6/4DV.
An order was placed from the Argentine Government, which amounted to 100 S6 tipper waggons exported to Pategonia. The design of the cab was adapted to the sandy terrain of the Argentine landscape.
The six wheeled versions of both the 4 and 6 cylinder diesel engines were introduced. D/V 4/6 & D/V 6/6.
The Sentinel 44 seater Diesel bus was introduced with 6 cylinder engine and their own built body.
30 ft coach chassis with 6 cylinder, direct injection diesel engine made available to coach builders.