At the beginning of World War II, all of Tyrol was seized and Aryanized, and the company was to 'work for the benefit of the country'.

The plant made brake pads for the Deutsche Reichsbahn, and from 1939 they made airframe parts and rocket motors in Jenbach (some to liquid-fueled aircraft rocket engine designs from Hellmuth Walter KG) for Heinkel as the licensee.

Because of the availability of appropriate specialists and skilled workers, it was decided to concentrate on the production of diesel engines.

In 1959 the company was constituted as Jenbacher Werke AG, the main shareholders being Creditanstalt with 35% and Mannesmann with 26%, the rest being free float.

Integral lost over 22 million Euros from 1997 to 2001, and led to the sale of the Jenbacher rail car division to Connex.

Jenbacher Werke designated their locomotives according to a system derived from the type of power transmission, approximate performance, wheel arrangement or application and the operating weight.

Jenbacher manufactures the gas engines from the ground-up at this facility, including in-house crankshafts.

Jenbacher gas engines are exclusively Otto cycle units with industrial grade spark plugs providing ignition.

Due to this flexibility they are often used in applications where gas would normally be flared off or released into the atmosphere, to turn waste into energy.

Methane has a much higher global warming potential than CO2,[12] and it is therefore interesting for operators to burn gas in engines instead of releasing it into the atmosphere.

Further applications include data centers, greenhouses or heat & power units for industrial use.

In common with most current marine diesel engines, the J920 has a segmented camshaft, along with combining individual cylinder heads, the cylinder liner, piston and connecting rod into one easily removable modular 'power unit' for ease of maintenance and overhaul.