PART 8: MAINTENANCE AND SERVICE
PB1319 (CAT. NO. 5296 ) —155— 22-01691 (R02/02)
2. Check the clutch operation by starting the engine when it is cold.
Then idle it at about 800 RPM. Listen for air leaks. Check that the
fan is not working while the engine is warming. When the clutch
engages, note the reading on the vehicle’s panel-mounted coolant
temperature gauge. If the fan clutch engages at low engine temper-
ature or cycles on and off more frequently than it should (receives
“false signals”), have the problem corrected at your dealership.
Air Intake System
Engine heat, vibration, and age combine to loosen air intake connec-
tions and cause cracks in the tubing and elbows. Leaks in the intake
system allow abrasive dust to enter the engine and quickly cause
expensive damage. During your daily walk-around inspection, care-
fully check all tubing, elbows, clamps, supports, and fasteners for
condition and tightness.
Under normal operating conditions, we recommend complete disassem-
bly and cleaning of the air intake system annually. Under severe operat-
ing conditions, such as heavy off-highway use, the disassembly and
cleaning should be more frequent. Replace any defective parts. With
the possible exception of mounting brackets, don’t repair defective parts.
Air Cleaners
This service information is basic to all air cleaner makes and models.
Service the air cleaner filter elements as specified in the Preventive
Maintenance Schedule. If your vehicle is equipped with an optional
air inlet restriction indicator, service the filter elements when the air
inlet restriction indicator locks in the extreme Up position. Paper ele-
ments require care and proper handling because they are critical to
engine service life.
Turbocharger
When servicing the air intake and exhaust systems on a turbocharged
engine, check the following. 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.
• Manifold. With the engine operating, check for leaking manifold or
flange gaskets.
WARNING! Do not operate engine with turbocharger intake
piping disconnected. Working around a turbocharger with
the intake piping removed can be dangerous. 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 cold be seriously injured. Always keep the intake
piping connected when you will be running the engine.
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