Operation and maintenance manual

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IntakeManifoldPressure‐Check
Install pressure gauge, Part No. ST-1273, to the fitting in
the turbocharger outlet.
Install another pressure gauge, Part No. ST-1273, in the
intake manifold.
Operate the engine at rated RPM and load. Record the
readings on the two gauges.
If the differential pressure is greater than 21 kPa [3 psi],
check the charge air cooler for plugging. Clean or
replace if necessary
Intake Manifold Temperature-Check
Install a temperature gauge in the intake manifold.
Lock the fan drive in the ON mode to prevent erratic test
results. This can be done by installing a jumper across
the temperature switch or supplying shop air to the fan .
Refer to the fan drive manufacturer for lock-up
procedure.
NOTE: Some trucks have a manual switch that
will lock on the fan.
Operate the engine at rated RPM and load.
Record the intake manifold temperature.
Measure the ambient temperature at least two
feet in front of the vehicle.
The maximum temperature differential must not
be greater than 25°C [45°F]
If the temperature differential is greater than
25°C [45°F] check the charge air cooler for dirt and
debris on the fins, and clean as necessary. If the
problem still exists, check the cooler for internal
contamination or plugging.
To check the charge air cooler or cracked tubes or
header, remove the inlet and outlet hoses from the
cooler.
Remove the charge air cooler.
Install a cap over the outlet side of the cooler.
Install a pressure gauge and a shop air supply line
to the inlet side of the cooler.