Peterbilt Medium Duty Trucks Operator's Manual after 1-07
Peterbilt Medium Duty Trucks Operator's Manual after 1-07
Peterbilt Medium Duty Trucks Operator's Manual after 1-07
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Operating the Engine<br />
WARNING! Never idle your vehicle for prolonged<br />
periods of time if you sense that exhaust fumes<br />
are entering the cab. Investigate the cause of the<br />
fumes and correct it as soon as possible. If the<br />
vehicle must be driven under these conditions,<br />
drive only with the windows slightly open. Failure<br />
to repair the source of the exhaust fumes<br />
may lead to personal harm.<br />
Operating Instructions<br />
damage from lack of lubrication. The normal torsional<br />
vibrations generated can also cause transmission wear.<br />
• During the time it takes you to drink a cup of coffee, your<br />
engine can cool as much as 60° F (33° C) below normal<br />
operating temperature. To keep the engine warm during<br />
a short break, turn it off. Do not allow your engine to idle<br />
longer than five minutes.<br />
Idling the Engine<br />
Under most circumstances, continuous idling of your engine<br />
merely wastes fuel. In severe Arctic weather conditions, however,<br />
you may need longer idling to be sure all parts of your<br />
engine are fully lubricated.<br />
CAUTION: Do not allow your engine to idle, at<br />
low rpm (400–600 rpm), longer than five minutes.<br />
Long periods of idling <strong>after</strong> the engine has<br />
reached operating temperatures can decrease<br />
engine temperature and cause gummed piston<br />
rings, clogged injectors, and possible engine<br />
Engine Fan Switch (Option)<br />
Your <strong>Medium</strong> <strong>Duty</strong> may have an engine fan switch installed<br />
as an option. The switch, which is mounted on the accessory<br />
switch panel, allows you to control the engine fan manually or<br />
automatically.<br />
• With the ignition key switch ON and the fan switch in the<br />
ON position, the engine fan will be on regardless of<br />
engine temperature.<br />
• With the engine fan switch in the AUTOMATIC position,<br />
the engine fan will automatically turn on when the engine<br />
coolant reaches a temperature of about 200°F (93°C)<br />
– 64 – Y53-6008 <strong>Medium</strong> <strong>Duty</strong> (R10/06)