freightliner CENTURY CLASS S Driver Manual page 110

Engines and Clutches
6. If equipped with an idle shutdown timer, it can be
set to shut the engine down after a preset
amount of time. Ninety seconds before the pre-
set shutdown time, the CHECK ENGINE light will
begin to flash at a rapid rate. If the clutch pedal
or service brake indicate a position change dur-
ing this final ninety seconds, diagnostic lamp
flashing, the idle shutdown timer will be disabled
until reset.
7. If freezing temperatures are expected, allow the
engine jacket water expansion tank to cool, then
check the coolant for proper antifreeze protec-
tion. The cooling system must be protected
against freezing to the lowest expected outside
temperature. Add permanent-type antifreeze, if
required.
8. Repair any leaks, perform minor adjustments,
tighten loose bolts, etc. Observe the vehicle mile-
age or the service meter reading, if so equipped.
Perform periodic maintenance as instructed in
the Maintenance Interval Schedule in the Cater-
pillar Operation and Maintenance Manual .
Cummins
CAUTION
When safe to do, shut down the engine at the
first sign of malfunction. Almost all malfunctions
give some warning to the operator before signifi-
cant damage occurs. Many engines are saved
because alert operators heed warning signs (sud-
den drop in oil pressure, unusual noises, etc.)
and immediately shut down the engine. Failure to
do so could damage the engine.
1. With the vehicle stopped, apply the parking
brakes, and place the transmission in neutral.
IMPORTANT: Bearings and seals in the turbo-
charger are subjected to the high heat of com-
bustion exhaust gases. While the engine is run-
ning, this heat is carried away by oil circulation,
but if the engine is stopped suddenly, the turbo-
charger temperature may rise as much as
100°F (56°C). The extreme heat may cause
bearings to seize or oil seals to leak.
2.
Idle the engine three to five minutes before shut-
ting it down. This allows the lubricating oil and
the water to carry heat away from the combus-
7.19
tion chamber, bearings, shafts, etc. This is espe-
cially important with turbocharged engines.
NOTE: Do not idle the engine for excessively
long periods. Long periods of idling are not
good for an engine because the combustion
chamber temperatures drop so low the fuel may
not burn completely. This will cause carbon to
clog the injector spray holes and piston rings,
and may result in stuck valves.
3.
If the engine coolant temperature becomes too
low, raw fuel will wash the lubricating oil off the
cylinder walls and dilute the crankcase oil; there-
fore, all moving parts of the engine will suffer
from poor lubrication.
4. Turn off the ignition switch and shut down the
engine.
DDE S60
1. With the vehicle stopped, apply the parking
brakes, and place the transmission in neutral.
2. Allow the engine to run at idle for four to five
minutes. This allows the engine to cool and the
turbocharger to slow down.
CAUTION
After high-speed operation, shutting down the
engine without idling may cause damage to the
turbocharger, as it will continue to turn without
an oil supply to the bearings.
3. Turn off the ignition switch and shut down the
engine.
Mercedes-Benz
If any of the following occur, shut down the engine
immediately.
•
The oil pressure swings back and forth or falls
sharply.
•
Engine power and rpm fall even though the
throttle pedal remains steady.
•
The exhaust pipe gives off heavy smoke.
•
The coolant and/or oil temperature climb ab-
normally.