Flame proof power pack

A power pack including an electrically controlled internal combustion engine, characterized in that:

• the internal combustion engine (12) is provided with a turbo charger (22) located in a first housing (24) with sealed joints at all connections, the turbo charger (22) being immersed in liquid coolant which flows through the first housing;
• the first housing is secured to a liquid cooled exhaust manifold so as to receive liquid coolant therefrom;
• and
• the internal combustion engine is further provided with an exhaust treatment device in communication with an exhaust outlet of the turbo charger so as to receive gas therefrom, the exhaust treatment device being disposed within a second housing (32), the second housing having a double skin and receiving a layer of liquid coolant from the first housing, the layer of liquid coolant flowing between an inner layer and an outer layer of the double skin;
• so that, in operation, the surface temperature of the power pack remains below 150 degrees Celsius.