The paper reviews very briefly the development of the Pescara free-piston engine and outlines the general constructional features of the GS 34 design of free-piston gas generator. The arrangements for the application of lubricants are described, illustrating the total loss and circulating oil systems. The requirements of lubricants are discussed together with some operating troubles associated with lubrication. The paper concludes with the contention that the individual efforts of the engine and petroleum industries will find their best return in co-operative action at all stages of further development.
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