JH Series Operation Manual 15PRODUCT OVERVIEWYANMAR JH SERIESFEATURES ANDAPPLICATIONSThe JH series are four-stroke directinjection diesel engines equipped withliquid coolant systems.The 3JH5E is 3-cylinder and naturallyaspirated.The 4JH5E is 4-cylinder and naturallyaspirated.The 4JH4–TE is 4-cylinder andturbocharged.The 4JH4–HTE1, 4JH4–HTE is 4-cylinderand turbocharged with an air cooler.The engines are equipped with a marinegear or sail drive unit.These engines are designed for pleasurecraft use.It is recommended that new vessels bepropped so the engines can operate at 100to 200 min -1 above the fuel stop powerengine speed to allow for some addedweight and hull resistance.Failure to do so can lead to reduced vesselperformance, lead to increased smokelevels and cause permanent damage toyour engine.The engine must be installed correctly withcoolant lines, exhaust gas lines andelectrical wiring. Any auxiliary equipmentattached to the engine should be easy touse and accessible for service. To handlethe drive equipment, propulsion systems(including the propeller) and other inboardequipment, always observe theinstructions and cautions given in theoperation manuals supplied by theshipyard and equipment manufacturers.The JH series engines are designed to beoperated at maximum throttle(3000 to 3200 min -1 ) for less than 5% oftotal engine time (30 minutes out of every10 hours) and cruising speed (2800 min -1or less).The laws of some countries may requirehull and engine inspections, depending onthe use, size and cruising area of the boat.The installation, fitting and surveying ofthis engine all require specializedknowledge and engineering skills. SeeYanmars local subsidiary in your region oryour authorized Yanmar Marine dealer ordistributor.
