GENERAL SERVICE INFORMATION
3TNV88F Service Manual
4-7
Function of Major Engine Components
FUNCTION OF MAJOR ENGINE COMPONENTS
Components
Functions
Air cleaner
The air cleaner prevents airborne contaminants from entering the engine.
Since the air cleaner is application specific, it must be carefully selected by
an application engineer. It is not part of the basic engine package as shipped
from the YANMAR factory. Periodic replacement of the air cleaner filter
element is necessary. See the
Periodic Maintenance Schedule on page 5-5
for the replacement frequency.
Alternator
The alternator is driven by a V-belt which is powered by the crankshaft V-
pulley. The alternator supplies electricity to the engine systems and charges
the battery while the engine is running.
Dipstick (engine oil)
The engine oil dipstick is used to determine the amount of engine oil in the
crankcase.
Electric fuel pump
The electric fuel pump makes sure there is a constant supply of diesel fuel
to the fuel injection pump. The electric fuel pump is electro-magnetic and
runs on 12 V DC. It must be installed on every application. This is standard
equipment with every engine.
Engine oil filter
The engine oil filter removes contaminants and sediments from the engine
oil. Periodic replacement of the engine oil filter is necessary. See the
Periodic Maintenance Schedule on page 5-5
for the replacement frequency.
Engine oil cooler
(if equipped)
The engine oil cooler helps to keep the engine oil cool. Engine coolant from
the cooling system is circulated through an adapter at the base of the engine
oil filter assembly and then returned to the coolant pump inlet.
Fuel filter
The fuel filter removes contaminants and sediments from the diesel fuel.
Periodic replacement of the fuel filter is necessary. See the
Maintenance Schedule on page 5-5
for the replacement frequency.
Please note that the word “diesel” is implied throughout this manual
when the word “fuel” is used.
Fuel filter/water separator
The fuel filter/water separator removes contaminants, sediments and water
from the diesel fuel going to the fuel filter. This is a required component of
the fuel system. This is standard equipment with every engine. The
separator is installed between the fuel tank and the electric fuel pump.
Periodically drain the water from the fuel filter/water separator.
Fuel tank
The fuel tank is a reservoir that holds diesel fuel. When the fuel leaves the
fuel tank it goes to the fuel filter/water separator. Next the fuel is pumped to
the fuel filter by the electric fuel pump. Then the fuel goes to the fuel injection
pump. Since the fuel is used to keep the fuel injection pump cool and
lubricated, more fuel than necessary enters the injection pump. When the
injection pump pressure reaches a preset value, a relief valve allows the
excess fuel to be returned back to the fuel tank. The fuel tank is a required
engine component.
Side and top filler port (engine oil)
You can fill the crankcase with engine oil from either the side or the top filler
port depending upon which one is most convenient.
Starter motor
The starter motor is powered by the battery. When you turn the key switch
in the operator’s console to the START position, the starter motor engages
with the ring gear installed on the flywheel and starts the flywheel in motion.
3TNV88F_SVM_A4.book 7 ページ ２０１２年７月２６日 木曜日 午後６時４分
