Intake Manifold Pressure
Measure the intake manifold pressure (turbocharger
boost). Install pressure gauge, Part No. ST-1273, in the
intake manifold as shown.
Observe the reading on the pressure gauge.
NOTE: Intake manifold pressure (turbocharger boost) must
be corrected for variances due to intake air temperature.
Use the ‘Boost Pressure Correction Factor’s explained in
Procedure 8-03.
Intake Air Temperature Control - Chassis
Dynamometer Test
When operating an engine on a chassis dynamometer,
follow these steps for best results and safe operation.
CELECT™ Engines:
Lock the cooling fan in the ‘‘ON’’ mode. This can be done
by installing a jumper across the temperature switch, or
by supplying shop air to the control valve. Refer to the fan
drive manufacturer for the recommended procedure.
Monitor the intake manifold air temperature using
Compulink™ in the monitor mode, or install Fluke digital
thermometer, Part No. 3822666, and thermocouple wire
kit, Part No. 3822988, into the intake manifold.
The intake manifold air temperature must not exceed
77°C [170°F]. The engine protection system will disrupt
performance if the temperatures exceed this level.
Maintain intake manifold air temperature to 66°C [150°F]
or below during chassis dynamometer operation.
If the intake manifold temperature exceeds 77°C [170°F],
shut off the engine. Allow the engine to cool.
Inspect the CAC fins for obstructions to the air flow.
Check the fan drive. Make sure the fan is locked in the
‘‘ON’’ mode.
Remove any obstructions such as a winterfront or debris.
Manually lock the shutters in the ‘‘OPEN’’ position if
equipped.
Inspect the dynamometer room for adequate supply of
suitably cool or outside air. Make sure that dynamometer
room recirculation is not an issue.
Resume the test.
Engine Testing General Test Procedure - Chassis Dynamometer (8-06)
N14 Page 8-45
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