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This Operation Manual was officially released by YANMAR Marine for 2YM15, 3YM20 and 3YM30) EPA certified marine diesel engines. Introduction; For Your Safety; Product Explanation; Operation; Maintenance and Inspection; Trouble and Troubleshooting; Piping Diagrams; Wiring Diagrams. The document shall be read very carefully prior to operating subject engine to make sure you are using it in a correct way and keep in best condition. The paper shall be readily acceptable to all personnel involved in operation/maintenance of this equipment since it provides all required safety information and technical data.