CHASSIS INFORMATION — 10
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20 08 CONTESSA
The diesel engine in the motorhome controls
engine speed by varying 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 amount of
intake manifold pressure measured in lbs./in².
Therefore, no intake manifold vacuum exists.
Diesel engine RPM (revolutions per minute) is
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 different. 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 minimize risk of an
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 manufacturers
owners manual or authorized repair
location for more information.
STARTING PROCEDURE
Normal Starting
When starting the engine, always use the
following procedure:
1. Turn off the headlights and any other
auxiliary equipment prior to starting to
ensure that all available battery power
is available for the starter motor.
2. Ensure that the park brake is applied.
3. Turn the ignition switch to the ON
position. Ensure the transmission is in
neutral.
4. Allow the “Wait to Start” light to cycle
off.
5. Look at the dash warning lights; the
CHECK TRANS light as well as
the PARK BRAKE light should
illuminate. The CHECK ENGINE
light should illuminate and then
cycle off. If any of the warning lights
fail to come on, investigate and
correct the cause of the problem. If
the CHECK ENGINE light remains
on, or re-illuminates after starting,
the engine ECM may have detected
an engine systems fault. Refer to the
diagnostics section of the Caterpillar
Operation & Maintenance Manual
for corrective action.
6. If CHECK TRANS fails to illuminate,
or remains on after starting, refer to the
Transmission Operators Manual for
corrective action.
7. Pressing the throttle or holding the
throttle down is not needed. Turn
the ignition switch to the START
position and crank the engine. The
electronic controls on the engine
will automatically deliver the correct
amount of fuel for the engine to start.
8. Release the ignition switch to the ON
position immediately after the engine
starts.
9. Allow the engine to idle with no load
for three to ve minutes. Observe
all gauges and warning lights during
warm-up.
NOTE:
To avoid starter motor damage, do
not crank the engine for more than
15 seconds at one time. If the engine
fails to start, wait two minutes before
attempting to start the engine again.
NOTE:
Oil pressure should indicate within 15
seconds after the engine has started.
DO NOT increase engine speed until
the oil pressure gauge indicates normal.
If no oil pressure is indicated within
15 seconds, stop the engine. DO NOT
attempt to operate. The engine will need
inspected and repaired prior to re-start.
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