PRODUCT OVERVIEW
22 JH Series Operation Manual
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 76.
Fuel Feed Pump Pumps fuel from the tank to the fuel injection system.
Fuel Priming Pump (if
equipped)
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 the element should be replaced
periodically. See Changing the Engine Oil and Replacing the Engine Oil Filter Element on
page 82.
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 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 and intake air (depending on
model) through the cooler(s) in an open circuit.
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.
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 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.
Oil Cooler - Engine A heat exchanger that cools high temperature engine oil using coolant.
Oil Cooler - Marine Gear
(Optional)
This heat exchanger cools the marine gear (KMH4A) oil using seawater.
Turbocharger (if equipped) The turbocharger pressurizes the air coming into the engine. It is driven by a turbine that is
energized by exhaust gases.
Air cooler (if equipped) This heat exchanger cools the pressurized charging air from the turbocharger with seawater
to increase the charging air quantity.
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.
Starter Starter motor for the engine. Powered by the battery.
Alternator Driven by belt and generates electricity and charges the battery.
Engine Oil Dipstick Gauge stick for checking the engine oil level.
JH5_EN_OPM.book 22 ページ ２０１３年８月８日 木曜日 午前９時２３分
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