FUNCTION OF MAJOR COMPONENTS
Name of Component Function
Fuel Filter Removes dirt and water from the fuel. The filter is a cartridge type, and the
inner element should be replaced before clogging occurs. A water separator
is on the bottom of the filter and should be drained periodically.
Fuel Feed Pump A mechanical pump that pumps fuel from the tank to the fuel injection pump.
It is built in to the fuel injection pump.
Fuel Bleed Pump This is a manual fuel pump. Pushing the knob on the top of the fuel filter
feeds the fuel. The pump is also used to bleed air from the fuel system.
Engine Oil Filler Port Filler port for engine oil.
Engine Oil Filter Filters fine metal fragments and carbon from the engine oil. Filtered engine
oil is distributed to the engine’s moving parts. The filter is a cartridge type
and should be replaced periodically.
Engine Oil Dipstick Gauge stick for checking the engine oil level.
Marine Gear Oil Filler Port (If
Equipped)
Filler port for marine gear lube oil. Located on top of the marine gear case.
Cooling System There are two cooling systems: fresh water and seawater.
• Fresh Water (Coolant)
Tank
• Fresh Water Cooler
• Cooling Water Pump
The tank stores the fresh cooling water and is connected to the fresh water
cooler. Cooling seawater passes through the fresh water cooler to cool the
fresh water by heat exchange. After cooling, the cooled fresh water is fed
by the cooling water pump to the inside of the engine, around the combustion
chamber, turbocharger and then returned to the tank.
Filler Cap Located on the top of the fresh water recovery tank. It has two pressure
regulating valves (release and retraction valves). When the cooling water
tempereature rises, the pressure inside the fresh water tank increases
causing the release valve in the filler cap to open.
Coolant Recovery Tank Hot water and steam pass through a rubber hose to the subtank for cooling.
(The filler port and the subtank are connected by a rubber hose.) When the
load is reduced and the cooling water temperature falls, the pressure in the
fresh water tank is lowered, activating the retraction valve in the filler cap.
This causes the cool water in the subtank to return to the fresh water recovery
tank. This process reduces the consumption of cooling water.
Turbocharger A pressurized intake air feeding device. The exhaust gas turbine is rotated
by the exhaust gas and the power is used to rotate the blower. This
pressurizes the intake air for sending to the cylinder.
Intercooler This heat exchanger cools the pressurized charging air from the
turbocharger with water.
Zinc Anode The metal area of the seawater cooling system is prone to galvanic
corrosion. The zinc anode is installed in the various coolers to prevent this.
When the zinc anode becomes worn, components in the fresh water cooler,
oil cooler, etc. will corrode. Periodic replacement of the zinc anode is
necessary.
Nameplates Nameplates are provided on the engine and have the model, serial number
and other data.
Starter A DC motor for starting the engine. Electric current causes the pinion gear
to engage with the ring gear on the flywheel to start the engine.
Alternator This generator rotates by a V-belt drive to charge the battery during
operation.
PRODUCT OVERVIEW
14 6LPA Series Operation Manual
© 2007 Yanmar Marine International
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