freightliner S2 Operator's Manual page 59

Voltage-Based Auto High Idle
1. Place the shift lever in Neutral (N) or Park (P)
and set the parking brake.
2. The idle rpm will automatically increase when the
voltage drops below 12.2 volts. The rpm will in-
crementally increase every five seconds until
13.4 volts is achieved and maintained.
3.
The Voltage-Based Auto High Idle system is dis-
engaged by depressing the service brake pedal.
IMPORTANT: The Voltage-Based Auto High Idle
system will not return to normal operation until
one of the following occurs: The parking brake
is depressed and released, the key switch is
turned to the OFF position, or the transmission
gears are changed.
Engine Shutdown
Shut down the engine immediately if:
•
the oil pressure gauge needle swings back and
forth or falls sharply;
•
engine power and rpm fall, even though the
accelerator pedal remains steady;
•
the exhaust pipe gives off heavy smoke;
•
the coolant and/or oil temperature climb abnor-
mally;
•
abnormal sounds suddenly occur in the engine
or turbocharger.
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 115°F
(46°C).
1. With the vehicle stopped, place the transmission
in Neutral (N), or if so equipped, the Park (P) or
Park Brake (PB) position.
2. Set the parking brake.
3. Idle the engine for three to five minutes before
shutting it down. This allows the lubricating oil
and the coolant to carry heat away from the
combustion chambers, bearings, shafts, etc. This
is especially important with turbocharged en-
gines. The extreme heat can cause bearings to
seize or oil seals to leak.
NOTE: Long periods of idling are not good for
an engine because the combustion chamber
temperatures drop so low that the fuel may not
burn completely. This will cause carbon to clog
the injector spray holes and piston rings, and
can result in stuck valves.
NOTICE
Do not rev the engine before shutting it down.
Revving the engine before shutdown will damage
the turbocharger.
4.
Shut down the engine by turning the ignition
switch to the OFF position.
Engines
8.4