PRODUCT OVERVIEW
YM Series Operation Manual 17
12/05
FUNCTION OF MAJOR COMPONENTS
Name of Component Function
Fuel Filter Removes dirt and water from the fuel. Drain the filter periodically. The filter element should be
replaced periodically. The water separator (if equipped) should be drained periodically. See
Draining Fuel Filter / Water Separator on page 65.
Fuel Feed Pump Pumps fuel from the tank to the fuel injection system. Pushing the manual lever on the side of
the feed pump supplies fuel to the engine when fuel priming is needed.
Fuel Feed Lever Moving the fuel feed lever up and down feeds the fuel. The lever is used to bleed air from the
fuel system after running out of fuel.
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 the element should be replaced
periodically. See Changing the Engine Oil on page 61.
Marine Gear Filler Port Filler port for marine gear lube oil. Located on top of the marine gear case.
Cooling System There are two cooling systems: closed cooling with coolant (fresh water) and seawater. The
engine 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.
Closed Cooling Circulation
Pump
The centrifugal water pump circulates coolant inside the engine. The circulating pump is
driven by a V-ribbed belt.
Seawater Pump Pumps seawater from outside vessel to the engine. The seawater pump is gear-driven and
has a replaceable rubber impeller. Do not operate it without seawater, as this will damage the
impeller.
Coolant Filler Cap The filler cap on the heat exchanger / coolant tank covers the water supply port. The cap has
a pressure regulating valve. When the cooling water temperature rises, the pressure rises
inside the coolant system.
Reservoir The pressure valve in the filler cap releases vapor and hot water overflow to the reservoir.
When the engine stops and the coolant cools, the pressure in the coolant tank drops. The filler
cap vacuum valve then opens to send water back from the reservoir. This minimizes coolant
consumption. The closed cooling system coolant level can easily be checked and refilled in
this tank.
Engine Oil Cooler A heat exchanger that cools high temperature engine oil using coolant.
Intake Silencer (Air Cleaner) The intake silencer guards against dirt in the air and reduces the noise of air intake.
Nameplates Nameplates are provided on the engine and the marine gear and have the model, serial
number and other data. See Nameplates on page 16
Starter Starter motor for the engine; powered by the battery.
Alternator Driven by a belt and generates electricity and charges the battery.
Engine Oil Dipstick Gauge stick for checking the engine oil level.
YM OPM_EN.book 17 ページ ２０１３年６月７日 金曜日 午前１１時１１分
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