NOTE: Refer to Chassis Dynamometer Operation, Procedure 14-04, for general operating procedures and safety
precautions.
NOTE: Operate the vehicle in a gear that produces a road speed of 90 to 100 km/h [55 to 60 mph] at maximum horsepower RPM.
Monitor and record the following measurements during run-in:
• Compulink (install on CELECTTM engines)
• Lubricating oil pressure
• Coolant temperature
• Fuel pressure
• Torque
• Blowby
• Engine speed (RPM)
• Fuel flow (use service tool, Part No. 3376375)
Refer to the Chassis Dynamometer worksheet on the last page of this procedure.
To correctly evaluate the engine performance, this additional measurement, intake manifold pressure (Turbo-
charger boost), must be observed during engine run-in phases.
Refer to the Engine Dynamometer worksheet on the last page of this procedure.
NOTE: It is recommended to monitor block coolant pressure during run-in to aid in early indication of a cooling system problem.
If a sudden increase in blowby occurs, or if blowby exceeds the maximum allowable limit during any run-in,
return to the previous step and continue the run-in. If blowby does not reach an acceptable level during the
next step, discontinue the run-in and determine the cause.
Do not proceed to the next step until a steady, acceptable blowby reading is obtained.
NOTE: Blowby must be measured by using Service Tool, Part No. 3375150 or 3822566 with manometer, Part No.
ST-1111-3, or equivalent. Service Tool, Part No. 3375150, as shown, utilizes a chamfered 7.67 mm [0.302 in] orifice.
Move the throttle to obtain 1200 RPM engine speed, and apply a test load sufficient to develop 25 percent rated
fuel pressure or 25 percent fuel rate on CELECTTM engines.
Operate the engine at this speed and load level until the coolant temperature reaches 71°C [160°F].
Operate the engine at maximum horsepower RPM and 75 percent of rated fuel pressure or 75 percent fuel rate on
CELECTTM engines for 3 minutes. Check the gauges, and record the readings.
NOTE: Do not proceed to the next step until a steady, acceptable blowby reading is obtained.
Operate the engine at maximum horsepower RPM and Advertised Horsepower with a wide open throttle, for 5 minutes. Check the gauges, and record the readings.
Operate the engine at nominal torque peak RPM, full load, wide open throttle, for 5 minutes. Check the gauges,
and record the readings.
NOTE: Refer to the engine ‘‘Data Sheet’’ for the torque peak RPM of the engine model being tested.
Operate the engine at maximum horsepower RPM and Advertised Horsepower with a wide open throttle for 5
minutes. Check the gauges, and record the readings.
Compare the readings to those published on the appropriate engine ‘‘Data Sheet’’.
Caution: Do not shut off the engine immediately after the run-in is completed. Allow the engine to cool by
operating it at 700 to 900 RPM for a minimum of 3 to 5 minutes to avoid internal component damages. This allows the turbocharger and other components to cool.
Shut off the engine.
Make sure all instrumentation is removed before removing the vehicle from the chassis dynamometer.
