Engine; General Information - Monaco Cayman 2005 Owner's Manual

The diesel engine operates differently from the conventional gasoline engine. Gasoline engines con-
trol engine speed using a butterfly throttle plate controlling air/fuel mixture inlet flow. As the throttle plate
opens, vacuum created by the piston velocity draws the metered fuel/air charge into the combustion chamber,
then ignites from a controlled electric ignition source. Closing the throttle plate limits the fuel/air supply,
slowing engine speed, increasing intake manifold vacuum.
Diesel engine speed is controlled by varying the fuel supply only. No throttle plates are used. An exhaust
driven turbine system (turbocharger) compresses the fresh air supply into the engine. The fuel is injected
under pressure into the combustion chamber. Ignition of fuel/air charge occurs from heat generated by rapid
high compression. The turbo boost gauge registers the amount of intake manifold pressure measured in
lbs./in². Therefore, no intake manifold vacuum exists.
Diesel engine RPM (revolutions per minute) operating speeds are generally much lower than that of
the gasoline engine. Peak torque and horsepower output values occur at much lower engine speeds. Idle
speeds between the two engine types are similar, however maximum engine speeds are quite differ-
ent. The gasoline engine generally is not regulated to a maximum engine speed. The maximum engine
speed on a diesel engine is controlled by an engine speed governor set by the engine manufacturer.
WARNING:
Do not operate a diesel engine where there are or can be combustible vapors.
Vapors can be drawn through the air intake system and cause engine acceleration
and over-speeding, resulting in fire, explosion and extensive property damage.
Numerous safety devices are available, such as air intake shutoff devices, to mini-
mize risk of engine over-speeding where an engine (due to its application) might
operate in a combustible environment, such as fuel spills or gas leaks.
INFORMATION:
The equipment owner and operator is responsible for safe operation of engine.
Consult your engine authorized repair location for future information.
The Cummins diesel engine is a 6-cylinder in-line engine, utilizing an electronic fuel control system to
supply fuel to the cylinders for precise fuel delivery, as well as built-in diagnostics to monitor engine
operation.
Engine electronics also enable the use of programmable monitoring features that may cause limited
engine power/vehicle speed when certain conditions arise. These features limit the operation of the
engine when conditions that may damage the engine are encountered. These conditions may include such
events as low oil pressure and high coolant temperature. When the engine electronics encounter such a
condition, it limits the amount of power produced by the engine to help prevent or limit damage. It is
possible however, for the engine to be damaged if corrective action is not taken immediately if such a
condition exists.
Cayman 2005

General Information

Chassis Information --- Section 10

ENGINE

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