GENERAL SERVICE INFORMATION
4-6
TNV IDI Service Manual
Function of Major Engine Components
FUNCTION OF MAJOR ENGINE COMPONENTS
Component
Function
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.
Dynamo
The dynamo is driven by a V-belt which is powered by the
crankshaft V-pulley. The dynamo 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 VDC. An electric fuel pump may
be installed as standard equipment 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.
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.
Fuel Filter
The fuel filter removes contaminants and sediments from the diesel
fuel. Periodic replacement of the fuel filter is necessary. See the
Periodic 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 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 fuel pump. Periodically drain the water from the fuel filter / water
separator using the drain cock at the bottom of the separator.
Fuel Priming Lever
If the unit has a mechanical fuel pump, a fuel priming lever on the
mechanical fuel pump primes the fuel system. The fuel system
needs to be primed before you start the engine for the first time, if
you run out of fuel, or if fuel system service is performed. To prime
the fuel system, operate the fuel priming lever until the cup in the
fuel filter is full of fuel.
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