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PRODUCT OVERVIEW
22
6SY Operation Manual
FUNCTION OF MAJOR COMPONENTS
Name of part
Function
Fuel Filter
Removes dirt and water from the fuel. Drain the filter periodically. The filter
element should be replaced periodically.
See Drain or Replace the Fuel Filter
Element and Fuel Filter / Water Separator on page 89.
Fuel Feed Pump
Pumps fuel from the tank to the fuel injection system.
Engine Oil Fill Port
Fill 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.
Coolant System
There are two coolant systems: closed cooling with coolant and seawater. The
engine's combustion heat is cooled by the closed cooling circuit. The closed circuit
is cooled by seawater using a heat exchanger. The seawater also cools the
engine / marine gear oil.
Heat Exchanger
The heat exchanger cools the closed cooling circuit with seawater.
Closed Cooling Circulation
Pump
The centrifugal water pump circulates coolant inside the engine. The circulating
pump is driven by a belt.
Seawater Pump
The rubber impeller-type pump pumps seawater for cooling. Never operate it
without seawater, as this will damage the impeller.
Coolant Fill Cap
The fill cap on the coolant tank has a pressure regulating valve. When the coolant
temperature rises, the pressure rises inside the fresh water system.
Coolant Recovery Tank
The pressure regulating valve releases vapor and hot water overflow to the
coolant recovery tank. When the engine stops and the coolant cools, the pressure
in the coolant tank drops. The fill cap valve then opens to send water back from
the coolant recovery tank. This minimizes coolant consumption. The closed
cooling system coolant level can easily be checked and refilled in this tank.
Oil Cooler
A heat exchanger that cools high temperature engine oil using seawater.
Turbocharger
The turbocharger pressurizes the air coming into the engine. It is driven by a
turbine that is energized by exhaust gases.
Anode
The metal area of the seawater coolant system is prone to electrical corrosion. The
anodes are installed to prevent this corrosion. The anodes are reduced over time
by electrical corrosion and must be replaced before it is completely consumed in
order to ensure that the metal area of the seawater coolant system remains fully
protected.
Nameplates
Nameplates are provided on the engine and the marine gear and have the model,
serial number and other data.
Starter
Starter motor for the engine. Powered by the battery.
Alternator
Driven by belt and generates electricity and charges the battery.
Summary of Contents for 6SY Series
Page 1: ...6SY series OPERATION MANUAL 6SY Operation Manual P N 0A6301 G0000 MARINE ENGINES ...
Page 34: ...PRODUCT OVERVIEW 26 6SY Operation Manual This Page Intentionally Left Blank ...
Page 54: ...BEFORE YOU OPERATE 46 6SY Operation Manual This Page Intentionally Left Blank ...
Page 120: ...LONG TERM STORAGE 114 6SY Operation Manual This Page Intentionally Left Blank ...
Page 126: ...President Yanmar Marine Int l ...
Page 127: ...President Yanmar Marine Int l ...
Page 128: ...EPA WARRANTY USA ONLY 120 6SY Operation Manual This Page Intentionally Left Blank ...