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Cummins ISX11.9 CM2250 – Service Manual 018-023   Engine Testing

Table of Contents


Intake Restriction (maximum at advertised horsepower)

Exhaust Back Pressure (maximum)

Oil Pressure

Coolant Pressure

Coolant Temperature

Fuel Temperature

Fuel Restriction



Maintain the following limits during the engine test and run-in procedures:

Due to variations in ratings of different engine models, use the specific Engine Rating Data Sheet for the particular engine model being tested.

Charge-Air Cooler Restriction (maximum)

Mercury (mm and in) 76.2 mm Hg [3.0 in Hg]
Pressure (kilopascal and psi) 10.3 kPa [1.5 psi]
Clean Air Filter 254.0 mm H2O [10.0 in H2O]
Dirty Air Filter 635.0 mm H2O [25.0 in H2O]
310-330 Horsepower Ratings 158 mm Hg [6.3 in Hg]
350-370 Horsepower Ratings 173 mm Hg [6.8 in Hg]
370-400 Horsepower Ratings 188 mm Hg [7.3 in Hg]
400-425 Horsepower Ratings 195 mm Hg [7.8 in Hg]
430-450 Horsepower Ratings 210 mm Hg [8.4 in Hg]
Low Idle (minimum) 89.6 kPa [13.0 psi]
Oil Pressure Range 207 to 345 kPa [30 to 50 psi]
Cylinder Block Coolant Pressure (closed thermostat, maximum) 510 kPa [74 psi]
Operating Temperature (maximum) 107°C [225°F]
Fuel Inlet Temperature (maximum) 71°C [160°F]
Fuel Inlet Maximum Restriction 101 mm Hg [4 in Hg]
Pressure Side Fuel Filter Restriction (maximum) 69.0 kPa [10.0 psi]
Fuel Drain Line Restriction (maximum) 203.0 mm Hg [8.0 in Hg]

Blowby (maximum at advertised or torque peak rpm) with 9-mm [0.354-in] orifice

Last Modified:  20-May-2010