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As the name of this film imples, it provides the basic introduction to the two-stroke marine diesel engines. It was prepared in co-operation of Viggo A. Kjaer, professor at The Royal Technical University of Denmark. Today, the diesel engine propells half the tonnage of all the world shipping. Given good care, the diesel engine provides a maximum of effect on a minimum of oil consumption. The engineer is here for that, at the moment he is checking the temperatures of exhaust and cooling water. His routine inspection takes him further down to the second platform with the intercoolers for charging air. Now, he reaches the bottom where his flashlight reveals the return piston cooling oil behind the sightglasses...