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This Operation Manual is intended to describe the various diesel engine parts and to prescribe simple checks for day-to-day engine maintenance. The publication covers 1GM, 2GM, 3GMD and 3HM marine diesel engines. We strongly recommend readers to get familiarized with this manual prior to the first start of your engine to insure proper use and handling. The present manual is concerned with the two-cylinder model. Though the 1GM, 3GMD and 3HM look differently, their handling is completely same, that is the main reason why the content of the present manual will be equally valuable to the personnel operating each of these engines.