User Manual

around inspection, carefully check all
tubing, elbows, clamps, supports, and
fasteners for condition and tightness.
Check the charge-air-cooler for air leaks
annually
. The air leaks can be caused by
cracked tubes or header. For service see
your authorized dealer.
CAUTION
DO NOT use air intake pipes and con-
nections
as a step or to pull yourself
up. This could loosen the connections
and open the system to unfiltered air
which could damage the engine.
Turbocharger
WARNING
DO NOT operate engine with turbo-
charger
intake piping disconnected. A
suction is created when the engine is
running. This suction could draw your
hand or anything else near it into the
impeller fan. You could be injured. Al-
ways keep the intake piping connected
when you will be running the engine.
When servicing the air intake and exhaust
systems on a turbocharged engine, check
the items listed below:
Lubricating System
Check the oil lines, housing, and
connections. Look for leaks, damage, or
deterioration. Leaks could mean you have
damaged oil lines or oil seals.
Manifold
With the engine operating, check for
leaking manifold or flange gaskets.
High Frequency V
ibration
Vibration may indicate turbo rotor
imbalance. Have your dealer investigate
this immediately. If you detect any
deficiencies, take the vehicle to an
authorized dealer for servicing. Delay could
lead to severe and expensive damage to
your vehicle.
Engine Air Filters
The following service information is basic
to all air cleaner makes and models.
Service the filter elements when the
(option) locks in the extreme High position.
Have the element serviced at an
authorized Kenworth Dealer. Paper
elements require care and proper handling,
because they are critical to engine service
life.
Service the air cleaner periodically. If the
vehicle operates in areas with heavy dust,
maintenance should be more frequent.
Replace Engine Air Filter
If the vehicle is equipped with Cab
mounted air cleaner and under hood air
intake option, remove the air solenoid first..
1. Park the vehicle. Set the parking
brake and turn the ignition OFF.
2. If the air cleaner is under the hood,
open the hood to access the air
filter housing.
3. Loosen the hardware that holds the
housing cap to the main filter
enclosure.
4. Pull the air filter housing cap away
from the main enclosure to access
the filter.
5. Visually inspect the filter housing,
enclosure, and hardware for
damage.
MAINTENANCE - Engine Maintenance
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