PRECAUTIONSThe Importance of PeriodicMaintenanceEngine deterioration and wear occur inproportion to the length of time the enginehas been in service and the conditions theengine is subjected to during operation.Periodic maintenance prevents unexpecteddowntime, reduces the number of accidentsdue to poor engine performance and helpsextend the life of the engine.Performing PeriodicMaintenanceWARNING! NEVER block windows,vents, or other means of ventilation ifthe engine is operating in an enclosedarea. All internal combustion enginescreate carbon monoxide gas duringoperation. Accumulation of this gaswithin an enclosure could cause illnessor even death. Make sure that allconnections are tightened tospecifications after repair is made to theexhaust system. Failure to comply couldresult in death or serious injury.The Importance of Daily ChecksThe Periodic Maintenance Scheduleassumes that the daily checks areperformed on a regular basis. Make a habitof performing daily checks before the startof each operating day. See Daily Checks onpage 33.Keep a Log of Engine Hours andDaily ChecksKeep a log of the number of hours the engineis operated each day and a log of the dailychecks performed. Also note the date, typeof repair (e.g., replaced alternator), andparts used for any service needed betweenthe periodic maintenance intervals. Periodicmaintenance intervals are every 50, 100,150, 250 and 1000 engine hours. NOTICE:Failure to perform periodic maintenancewill shorten the life of the engine andmay void the warranty.Yanmar Replacement PartsYanmar recommends that using genuineYanmar parts when replacement parts areneeded. Genuine replacement parts helpensure long engine life.Tools RequiredBefore starting any periodic maintenanceprocedure, make sure you have the toolsneeded to perform all of the required tasks.Ask Your Authorized YanmarMarine Dealer or Distributor ForHelpOur professional service technicians havethe expertise and skills to help with anymaintenance or service related procedures.PERIODIC MAINTENANCEYM Series Operation Manual 45© 2007 Yanmar Marine International