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

Shut–Down
3. Drain water from the air reservoirs.
• While the engine and air supply system are still
warm, drain moisture from the air reservoirs. Open
the reservoir drains just enough to drain the moisture.
Do not deplete the entire air supply. Be sure to
close the drains before leaving the vehicle.
4. Secure the vehicle, close all the windows, and lock all
doors.
Before Stopping the Engine
Do not shut off the engine immediately. A hot engine stores a
great amount of heat and it does not cool down immediately
after you shut if off. Always cool the engine down before shutting
it off. You will greatly increase its service life.
Idle the engine at 1000 rpm for five minutes. Then low idle for
thirty seconds before shutdown. This will allow circulating
coolant and lubricating oil to carry away heat from the cylinder
head, valves, pistons, cylinder liners, turbocharger, and
bearings. This way you can prevent engine damage that may
result from uneven cooling.
Turbocharger
Operating Instructions
This cooling-down practice is especially important for a turbocharged
engine. The turbocharger on your vehicle contains
bearings and seals that are subjected to hot exhaust gases.
While the engine is operating, heat is carried away by circulating
oil. If you stop the engine suddenly after a hard run, the
temperature of the turbocharger could rise to as much as
100°F (55°C) above the temperature reached during operation.
A sudden rise in temperature like this could cause the
bearings to seize or the oil seals to loosen.
Refueling
Air inside the fuel tanks allows water to condense in the tank.
To prevent this condensation while the vehicle is parked for
extended periods of time, fill the tanks to 95 percent of
capacity. Never fill to more than 95 percent capacity as this
provides room for expansion resulting from temperature
extremes. When refueling, add approximately the same
amount to each fuel tank on vehicles with more than one
tank.
– 114 – Y53-6008 Medium Duty (R10/06)