MODEL 330 OPERATOR'S MANUAL - Peterbilt Motors Company

Operating the Engine
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 1,000 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.
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).
Operating Instructions
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 64.
Idling the Engine
Under most circumstances, continuous idling of your engine
merely wastes fuel. In severe Arctic weather conditions, however,
you may need longer idling to be sure all parts of your
engine are fully lubricated.
CAUTION: Do not allow your engine to idle, at
low rpm (400–600 rpm), longer than five minutes.
Long periods of idling after the engine has
reached operating temperatures can decrease
engine temperature and cause gummed piston
rings, clogged injectors, and possible engine
damage from lack of lubrication. The normal torsional
vibrations generated can also cause
transmission wear.
– 60 – PB1318 3/01 Model 330