PRODUCT OVERVIEW YANMAR YM SERIES FEATURES AND APPLICATIONS Failure to do so can lead to reduced vessel performance, lead to increased smoke levels and cause permanent damage to your engine. The YM series are four-stroke swirl pre-combustion chamber diesel engines equipped with liquid coolant systems. The engine must be installed correctly with coolant lines, exhaust gas lines and electrical wiring. Any auxiliary equipment attached to the engine should be easy to use and accessible for service.
To handle the drive equipment, propulsion systems (including the propeller) and other inboard equipment, always observe the instructions and cautions given in the operation manuals supplied by the shipyard and equipment manufacturers. The 2YM15 is a 2-cylinder engine and is naturally aspirated. The 3YM20 is a 3-cylinder engine and is naturally aspirated. The 3YM30E, 3YM30 is a 3-cylinder engine and is naturally aspirated. The engines are equipped with a marine gear or sail drive unit. The YM series engines are designed to be operated at maximum throttle (3600 min -1 ) for less than 5% of total engine time (30 minutes out of every 10 hours) and cruising speed (3400 min -1 or less).
These engines are designed for pleasure craft use and complied with EPA regulation Tier3 marine from 2009 year. It is recommended that new vessels be propped so the engines can operate at 100 to 200 min -1 above the Maximum Rated output power engine speed (3700 to 3800) to allow for some added weight and hull resistance. The laws of some countries may require hull and engine inspections, depending on the use, size and cruising area of the boat. The installation, fitting and surveying of this engine all require specialized knowledge and engineering skills. See Yanmars local subsidiary in your region or your authorized Yanmar Marine dealer or distributor.
The engine must be able to reach the Maximum Rated Power engine speed (3600) under full load at all times. YM Series Operation Manual 11