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Peterbilt 579 - Page 82

Peterbilt 579
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INSTRUMENT PANEL
3
governed speed. (See your Engine
Operation and Maintenance Manual
for RPM
recommendations.)
The tachometer
will illuminate a small
green light just below the numbers
of the gauge. This is to indicate the
engine speed for optimal fuel economy.
See Optimal
Engine Speed on page
4-55 for
more information on how
to use
this indicator during normal
operation.
3. Engine, Coolant
Temperature
The water temperature gauge shows
the temperature of the engine coolant.
Under normal operating conditions
the water temperature gauge should
register between 165° and 205°F (74°
and 90°C). Under certain conditions,
somewhat higher temperatures may
be acceptable. But the maximum
allowable temperature is 210°F (99°C),
except for certain special engines.
Check your engine manual to be sure.
Please refer
to Engine is Overheating
on page
2-5 for instructions on what to
do if
the engine is overheating.
4. Fuel Level,
Primary
The Primary
Fuel gauge indicates the
total (approximate) amount of fuel in
the fuel tank. In addition to indicating
empty and full, the gauge(s) also
indicate the fuel level in graduated
increments. When the fuel level for the
tank is below 1/4 full, a red warning
light in the gauge will come on.
Primary
Secondary
3-10 Y53-6047–2C (04/13)

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