PART 7: STARTING & OPERATING THE VEHICLE
PB1319 (CAT. NO. 5296 ) —65— 22-01691 (R02/02)
2. After a few minutes of idling at 600 RPM, increase your idle speed
to 900 or 1000 RPM. Continue your warmup. This procedure
allows oil to warm and flow freely while pistons, liners, shafts, and
bearings expand slowly and evenly. In extremely cold tempera-
tures, you may have to increase idle speed.
3. Continue the engine warmup until the coolant temperature
reaches at least 130° F (54° C). At this temperature, you can use
partial throttle. Wait until the coolant temperature is at least 160° F
(71° C) before operating at full throttle.
CAUTION: The use of a winterfront can result in excessive
engine coolant, oil, and charge air (intake) temperatures,
which can lead to overheating and possible engine dam-
age. If you must use a winterfront, refer to the “Engine
Operation and Maintenance Manual” for operating restric-
tions and recommendations.
NOTE: In colder climates where the temperature is often
below freezing, the warmup for turbocharged engines is
especially important. Chilled external oil lines leading to the
turbocharger will slow the oil flow until the oil warms, reduc-
ing oil available for the bearings. Watch the engine oil tem-
perature or pressure gauge for a warming trend before
increasing engine idle speed (RPM).
WARNING! Exhaust fumes from the engine contain carbon
monoxide, a colorless and odorless gas. Do not breathe the
engine exhaust gas. A poorly maintained, damaged or cor-
roded exhaust system can allow carbon monoxide to enter
the cab. Entry of carbon monoxide into the cab is also possi-
ble from other vehicles nearby. Failure to properly maintain
your vehicle could cause carbon monoxide to enter the cab/
sleeper and causes serious illness.
CAUTION: Never idle your vehicle for prolonged periods of
time if you sense that exhaust fumes are entering the cab .
Investigate the cause of the fumes and correct it as soon
as possible. If the vehicle must be driven under these con-
ditions, drive only with the windows slightly open. Failure
to repair the source of the exhaust fumes may lead to per-
sonal harm.
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