PRODUCT OVERVIEW
18
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 Isuzu factory. Periodic replacement of the air cleaner filter element
is necessary. See the Periodic Maintenance Schedule on page 64 for the
replacement frequency.
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.
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.
Side and top filler port (engine oil)
You can fill the crankcase with engine oil from either the side or top filler
port depending upon which one is most convenient.
Engine oil filter
The engine oil filter removes contaminants and sediment from the engine
oil. Periodic replacement of the engine oil filter is necessary. See the
Periodic Maintenance Schedule on page 64 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 by the coolant pump through an adapter at
the base of the engine to the oil cooler and then to the cylinder block and
back to the coolant pump.
Fuel tank
The fuel tank is a reservoir that holds diesel fuel. When fuel leaves the fuel
tank it goes to the water separator. Next, fuel is pumped to the fuel filter by
the electric or mechanical fuel pump. Next the fuel goes to the fuel injection
pump. Since 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 excess fuel to
be returned back to the fuel tank. The fuel tank is a required engine
component.
Water separator
The water separator removes contaminants, sediment and water from
diesel fuel going to the fuel filter. This is a required component of the fuel
system and is standard equipment with every engine. The separator is
installed between the fuel tank and the fuel pump. Periodically drain the
water from the water separator using the drain valve at the bottom of the
separator.
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. An electric fuel pump may be installed as an option or as
standard equipment. Standard equipment may vary based on engine model
and specification. If an electric fuel pump is installed, turn the key switch to
the ON position for 10 to 15 seconds to prime the fuel system.
TNV_OperationManual_T4(under 19kW).book Page 18 Wednesday, June 17, 2015 11:23 AM
