Pierce Enforcer, Operator'S Manual

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Operating the Engine / 5-39
OPERATION
6. Connect one end of the second jumper cable to the negative (–) terminal on the booster battery, and the other
end to the frame of the disabled vehicle at least 18 inches (450 mm) away from the battery. Do not attach the
other end directly to the battery negative (–) terminal because a spark could occur and cause explosion of gases
normally present around the battery.
7. With the jumper cables properly attached, start the engine of the vehicle with the good (charged) battery. Run
the engine at moderate speed.
8. Start the engine in the vehicle with the discharged battery.
Remove the battery cables by reversing the above sequence exactly.
5-21. Operation of Engine in Fuel Rich Atmosphere
5-22. Air Restriction Indicator
A diesel truck engine may consume over 12,500 gallons of air for every gallon of fuel that it burns. The air cleaner
element filters this air to ensure that dirt and dust are not allowed to contaminate the engine. A dirty air cleaner
element is a common cause of air restriction. The result is too little air to burn all the fuel. Some of the excess fuel
will cause a smoky exhaust and lost horsepower. In addition, the excess fuel washes lubricating oil off cylinder walls
resulting in seized pistons and bearing failures. Regular inspection and maintenance of the air intake tubing and
connections is important to prevent any unfiltered air from entering the engine.
A pressure sensor located in the engine air intake tube triggers the air intake restriction indicator light located on the
dash panel.
On multiplexed vehicles, air restriction is monitored by the Command Zone™ system. During a restricted air intake
condition, a text message, caution light, and chime are activated on the Command Zone™ Information Center
(CZIC).
If the light or CZIC remains activated, any of the following conditions may be present:
•
The air cleaner filter element is dirty and requires replacement.
• The air cleaner filter element has become saturated with water over most or all of the element surface.
• The ductwork or screen in front of the air cleaner has become plugged or otherwise restricted.
The actual level of restriction at which the light comes on varies between chassis models and engine options.
Diesel engines do not require a spark for ignition and will continue to run as long as there is fuel
available. Varying the amount of fuel introduced into the chambers controls the speed of a diesel
engine. If the engine is operated in an atmosphere that is laden with fuel vapors such as is found at a
fuel spill, the engine may increase speed uncontrollably. Turning the ignition switch or battery switch
off in this situation will not affect the speed of the engine. Before operating a diesel engine in this type
of environment, ensure that the vehicle is equipped with a means of shutting off the air intake supply
to the engine and that the driver is present to operate the shutdown whenever the engine is running.