Peterbilt Medium Duty Trucks Operator's Manual after 1-07

Operating Instructions
After the engine starts and until operating conditions reach a
certain point, the system will continue to operate to eliminate
white-smoke exhaust.
Engine Warm–Up and Idling
The purpose of engine warm-up is to allow an oil film to be
established between pistons, shafts, and bearings while your
engine gradually reaches operating temperature.
Warm–Up Procedure
1. After you have started the engine, idle the engine at
approximately 600 rpm while you check vital engine systems:
– oil pressure
– air pressure
– alternator output (with the optional voltmeter)
2. Before placing engine under a load, continue warm-up
with the engine at 900 to 1000 rpm for 3 to 5 minutes.
• When a cold engine is started, increase the engine
speed (rpm) slowly to be sure adequate lubrication
is available to the bearings and to allow the oil pressure
to stabilize. In extremely cold temperatures,
you may have to increase idle speed.
Operating the Engine
NOTE: In colder climates where the temperatures
are often below freezing, sufficient warmup
for turbocharged engines is especially important.
Chilled external oil lines leading to the turbocharger
will slow the oil flow until the oil
warms, reducing oil available for the bearings.
Watch the engine oil pressure gauge for a
warming trend before increasing engine idle
speed (rpm).
3. Continue the engine warm-up 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. See “Operating Manual Transmissions” on page
67.
WARNING! Exhaust fumes from the engine contain
carbon monoxide, a colorless and odorless
gas. A poorly maintained, damaged, or corroded
exhaust system can allow carbon monoxide to
enter the cab or sleeper. Failure to properly
maintain your vehicle could cause carbon monoxide
to enter the cab and cause serious illnesses.
Medium Duty (R10/06) Y53-6008 – 63 –