Avance were a Swedish manufacturer of engines, tractors and other mechanical equipment. The range of engines was very wide, and rivalled anything offered in the world at that time. The company was among the very early pioneers of the diesel in hot bulb format, and offered four main types of engine:
Direct reversible by compressed air
Direct reversible by pre-ignition
Single direction with reversing gear
Single direction with controllable pitch propellor
All engines had water-cooled cylinder heads, hit and miss governors (unusual on a diesel) full lubrication by mechanical pump and individual injection pumps for each cylinder. Clutches were fitted to all reversible engines, to take the strain off the propellor and drive shaft while reversing of the engine took place.
Avance vanished from the industrial scene in the 1930's, presumably taken over by another Swedish company.
More information will be posted as soon as it is available