PERIODIC MAINTENANCE
104 6LY3 Operation Manual
Perform the following maintenance every
250 hours or one year of operation,
whichever comes first.
• Check Fuel Injector Spray Pattern
• Adjust Intake / Exhaust Valve
Clearance (1st Time)
• Drain the Fuel Tank
• Replace the Fuel Filter Element
• Replace the Engine Oil (Crankcase)
• Replace the Engine Oil Filter Element
• Check the Seawater Pump Impeller
• Replace the Anode
• Clean the Air Intake Silencer
• Clean the Exhaust / Water Mixing
Elbow
• Clean the Turbocharger Blower
• Flush the Aftercooler
• Check the Wiring Connectors
• Tighten All Major Nuts and Bolts
• Check or Replace the Flexible Engine
Mounts
• Replace Engine Coolant
Check the Fuel Injector Spray
Pattern
Inspection and adjustment are necessary
to obtain optimal fuel injection to ensure
the best possible engine performance.
This inspection requires specialized
knowledge and techniques. See your
authorized Yanmar marine dealer or
distributor to check the injection spray
condition.
Adjust Intake / Exhaust Valve
Clearance (1st Time)
Inspection and adjustment must be made
to correct opening / closing timing lags of
the intake / exhaust valves which might
arise due to initial parts wear. This
inspection requires specialized knowledge
and techniques. See your authorized
Yanmar marine dealer or distributor to
adjust the intake / exhaust valve clearance.
Every 250 Hours of Operation
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