Measure the intake pressure drop across the charge air cooler.
This test can be done with a mercury manometer or two separate gauges, Part No. ST-1273. If two gauges are
being used, calibrate both gauges on a common pressure source at 206 kPa [30 PSI] to ensure consistency.
Install one pressure gauge, Part No. ST-1273, in the fitting in the turbocharger compressor outlet elbow. Install the other pressure gauge in the fitting in the intake manifold.
Observe the reading on the gauges. Pressure drop must not be greater than:
102 mm Hg [4.0 in. Hg]
14 kPa [2.0 psi]
NOTE: When measuring the pressure drop, operate a dynamometer at the rpm that delivers the maximum horse-
power of engine tested. Engine speed will be 1600-1700 rpm on most engines.
