Yanmar 4BY2 Operation Manuals

Also see for 4BY2: Service manual

Contents

8. Install a new filter element. Ensure thefilter fits snugly in the filter cap.9. Install the cap and filter assembly.Tighten cap by hand until the sealtouches the housing.10. Tighten to 25 N·m (225 in.-lb).11. Fill with new engine oil. See AddingEngine Oil on page 29.NOTICE: NEVER mix different types ofengine oil. This may adversely affect thelubricating properties of the engine oil.NEVER overfill. Overfilling may result inwhite exhaust smoke, engineoverspeed or internal damage.12. Perform a trial run and check for oilleaks.13. Approximately 10 minutes afterstopping the engine, remove the oildipstick and check the oil level. Add oilif the level is too low.Checking Shift Cable AdjustmentSee your authorized Yanmar dealer ordistributor.Adjusting Propeller Shaft Alignment(If Equipped with Marine Gear)The flexible engine mounts are slightlycompressed during initial engine operationand may cause misalignment between theengine and the propeller shaft.This adjustment requires specializedknowledge and techniques. See yourauthorized Yanmar dealer or distributor.Every 50 Hours of OperationAfter you complete the initial 50 hourmaintenance procedures, perform thefollowing procedures every 50 hours ormonthly, whichever comes first.• Checking Seawater Filter (If Equipped)and Inlet• Checking the Air Intake System• Checking Battery Electrolyte Level(Serviceable Batteries Only)Checking the Seawater Filter (IfEquipped) and InletRefer to boat builder’s literature forinformation on the seawater filter.Checking the Air Intake SystemCheck the air intake system for damage orwear. If necessary, consult your authorizedYanmar dealer or distributor for repair.Checking the Battery ElectrolyteLevel (Serviceable Batteries Only)WARNING! Batteries contain sulfuricacid. NEVER allow battery fluid to comein contact with clothing, skin or eyes.Severe burns could result. ALWAYSwear safety goggles and protectiveclothing when servicing the battery. Ifbattery fluid contacts the eyes and / orskin, immediately flush the affected areawith a large amount of clean water andobtain prompt medical treatment.NOTICE: NEVER turn off the battery switch(if equipped) or short the battery cablesduring operation. Damage to the electricsystem will result.1. Turn the battery master switch OFF (ifequipped) or disconnect the negative (-)battery cable.2. Do not operate with insufficient batteryelectrolyte as the battery will bedestroyed.PERIODIC MAINTENANCEBY Series Operation Manual 49© 2008 Yanmar Marine International