PRODUCT OVERVIEW
22
TNV Operation Manual
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.
Fuel Tank The fuel tank is a reservoir that holds diesel fuel. When fuel leaves
the fuel tank it goes to the fuel filter / 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.
Mechanical Fuel Pump The mechanical fuel pump is a diaphragm type of pump and is
installed on the fuel injection pump body. The mechanical fuel
pump is driven by a cam on the camshaft of the fuel injection pump.
An electric fuel pump is available as an option. The mechanical fuel
pump is not installed on the fuel injection pump if the electric fuel
pump option is installed.
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.
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.
Turbocharger
(Only applies to 3TNV84T,
4TNV84T, 4TNV98T,
4TNV106T)
The turbocharger pressurizes the air coming into the engine. It is
driven by a turbine that is energized by exhaust gases.
Components Functions
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