Function Of Major Components - Yanmar 3JH4E Operation Manual

PRODUCT OVERVIEW

FUNCTION OF MAJOR COMPONENTS

Name of Component
Fuel Filter
Fuel Feed Pump
Fuel Priming Pump (if
equipped)
Engine Oil Filler Port
Engine Oil Filter
Marine Gear Filler Port
Cooling System
Closed Cooling
Circulation Pump
Seawater Pump
Coolant Filler Cap
Coolant Recovery Tank
Oil Cooler - Engine
Oil Cooler - Marine Gear
(Optional)
Turbocharger (if
equipped)
Intercooler (if equipped)
Intake Silencer (Air
Cleaner)
Nameplates
Starter
Alternator
Engine Oil Dipstick
20
Function
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.
Pumps fuel from the tank to the fuel injection system.
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.
Filler port for engine oil.
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 69.
Filler port for marine gear lube oil. Located on top of the marine gear case.
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 and intake air (depending on model) through the cooler(s)
in an open circuit.
The centrifugal water pump circulates coolant inside the engine. The circulating
pump is driven by a V-belt.
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.
When the coolant temperature rises, the pressure inside the fresh water tank
increases and opens the pressure valve in the filler cap. When the pressure valve
in the filler cap is opened, hot water and steam pass through a rubber hose to the
coolant recovery tank. When the engine cools and the pressure inside the coolant
recovery tank drops, the vacuum valve in the filler cap opens and the coolant in
the coolant recovery tank returns to the water tank through the pipe and filler cap.
This minimizes coolant consumption.
The pressure valve in the filler cap 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 filler cap vacuum valve then opens to send water
back from the coolant recovery tank. This minimizes coolant consumptions. The
closed cooling system coolant level can easily be checked and refilled in this tank.
A heat exchanger that cools high temperature engine oil using coolant.
This heat exchanger that cools the marine gear (KMH4A) oil using seawater.
The turbocharger pressurizes the air coming into the engine. It is driven by a turbine
that is energized by exhaust gases.
This heat exchanger cools the pressurized charging air from the turbocharger with
seawater to increase the charging air quantity.
The intake silencer guards against dirt in the air and reduces the noise of air intake.
Nameplates are provided on the engine and the marine gear and have the model,
serial number and other data.
Starter motor for the engine. Powered by the battery.
Driven by belt and generates electricity and charges the battery.
Gauge stick for checking the engine oil level.
JH4 Series Operation Manual