KENR6933 61
Troubleshooting Section
•
Damaged cylinder head
3. Perform all necessary repairs.
4. Ensure that the
repairs have eliminated the faults.
5. If the repair does not eliminate the fault refer to
“Individual M
alfunctioning Cylinder”.
Individual Malfunctioning Cylinder
1. With the engine speed at a fast idle, use the
electronic service tool to isolate one cylinder at
atime.Noteif
there is any reduction in engine
speed. If a reduction in engine speed is not noted,
the isolated cylinder is not operating under normal
conditions.
If the isolation of a particular cylinder
results in a reduction of engine speed that is less
than normal, this may indicate that the cylinder is
operating be
low normal performance. Investigate
the cause of the fault on any cylinder that is
not operating. Investigate the cause of the fault
on any cylin
der that is operating below normal
performance.
2. Rectify any
faults.
i02414540
Intake Air Temperature Is Too
High
Probable Causes
•
High ambient air temperature
•
Intake air restriction and/or high altitude
•
Intake air from a heated area
•
Intake manifold air temperature sensor and/or
circuit
•
Insufficient ambient air flow over the engine
•
Reduced ambient air flow through the air charge
cooler
•
Reduced flow of intake air through the air charge
cooler
Recommended Actions
High Ambient Air Temperature
1. Determine if the ambient air temperature is within
the design specifications for the cooling system
and the air charge cooler.
2. When the ambient temperature exceeds the
capability of t
he cooling system or the air charge
cooler, operate the engine at a reduced load or
operate the engine at a reduced speed.
3. When possible, modify the cooling system and
the air charge cooler in order to make the system
suitable for
local conditions.
Intake Air Res tric tion and/or High Altitude
Low air pressure at the air intake for the turbocharger
can be caused by a restriction in the air intake or a
high altitud
e. When the pressure of the intake air
is low, the turbocharger (if equipped) works harder
in order to achieve the desired intake manifold
pressure. Th
is increases intake air temperature.
Measure the intake manifold pressure while the
engine is op
erating under load. For specificdata,
refer to the Perkins Technical Marketing Information
for the engine.
Intake Air Restriction
1. Check for bl
ocked air filters. Check for obstructions
in the air intake.
2. Replace the
air filters or remove the obstruction
from the air intake.
High Altit
ude
Make sure that the settings for the engine are correct
for the alt
itude.
Intake Air from a Heated Area
1. Ensure that the air inlet system is not receiving
air from a heated area.
2. If necessary, relocate the air supply to the intake
manifold to the outside of the engine enclosure.
3. Check for air leaks in the pipe between the air inlet
and the inlet to the turbocharger compressor.
Intake Manifold Air Temperature Sensor
and/or the Circuit
1. Allow the intake manifold air temperature sensor
to cool and remove the sensor. Check the reading
for the in
take air temperature. If the sensor is
operating correctly, the reading and the ambient
temperature are approximately equal.
2. If the readings are approximately equal, reinstall
the sensor.
3. If the reading is not correct, replace the sensor
with a sensor that is known to be good. Verify that
the faul
tisrectified.
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