Every 250 Hours Of Operation - Yanmar 6LY3-STC Operation Manual

Every 250 Hours of Operation

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 Zinc 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.
6LY3 LDC Operation Manual
Drain the Fuel Tank
Position an approved container under the
fuel tank drain. Open the drain cock and let
the water, dirt, etc. drain from the tank's
bottom into the container. Drain until fuel
with no water and dirt flows out. Close the
drain cock. See Filling the Fuel Tank on
page 26.
Replace the Fuel Filter Element
See Replace the Fuel Filter Element on
page 51.
Replace the Engine Oil (Crankcase)
See Replace Engine Oil and Engine Oil
Filter on page 52.
Replace the Engine Oil Filter
Element
See Replace Engine Oil and Engine Oil
Filter on page 52.
Check the Seawater Pump Impeller
Depending on use, the inside parts of the
seawater pump deteriorate and discharge
performance drops.
At the specified interval or when the volume
of seawater discharged is reduced, inspect
the seawater pump in accordance with the
following procedures:
1. Loosen the side cover bolts and remove
the side cover.
2. Illuminate the inside of the seawater
pump with a flashlight and inspect.
3. If any of the following problems are
found, disassembly and maintenance
are necessary:
• Impeller blades are cracked or nicked.
• Edges or surfaces of the blades are
• Wear plate is damaged.
4. If no damage is found when inspecting
the inside of the pump, reassemble the
side cover.
Note: Fit the O-ring to the groove on the joint
face before replacing the side cover.
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PERIODIC MAINTENANCE
marred or scratched.
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