The engine run-in period allows the tester to detect assembly errors and to make final adjustments needed for
performance that meets specifications.
NOTE: The amount of time specified for the following engine run-in phases are minimums. Additional time can
be used, if desired, at each phase except engine idle periods.
Measurements from these indicators and gauges must be observed closely during all phases of the engine run-in
period. Refer to Procedure 014-005 in Section 14.
To evaluate the engine’s performance correctly, this additional measurement must be observed during engine
run-in phases.
It is good practice to observe these measurements even if engine performance meets specifications. If engine
performance does not meet specifications, these measurements can indicate possible reason s for under
performance.
Crank the engine and observe the lubricating oil pressure when the engine starts. If the engine fails to start within 30
seconds, allow the starter motor to cool for 2 minutes before cranking the engine again.
Engine lubricating oil pressure must be at least 69 kPa [10 psi] at 700 rpm.
Correct the problem if the lubricating oil pressure is not within specifications.
Operate the engine at approximately 800 rpm for 3 to 5 minutes.
NOTE: Repair all leaks or component problems before continuing the engine run-in.
Listen for unusual noises.
Watch for coolant, fuel, and lubricating oil leaks.
Check for correct engine operation in general.
Move the throttle to obtain 1200 rpm engine speed, and set the test load to 25 percent of the rated load.
Operate the engine at this speed and load level until the coolant temperature is 70ยฐC [158ยฐF].
Check all gauges, and record the data.
NOTE: Do not proceed to the next step until a steady blow by reading is obtained.
Adjust the throttle to obtain peak torque rpm, and adjust the dynamometer load to 50 percent of torque peak load.
Operate the engine at this speed and load level for 2 minutes.
Check all gauges, and record the data.
NOTE: Do not proceed to the next step until blow by is stable within specifications.
With the engine speed remaining at torque peak rpm, increase the dynamometer load to 75 percent of torque
peak load. Operate the engine at this speed and load level for 2 minutes.
Check all gauges, and record the data.
NOTE: Do not proceed to the next step until blow by is stable within specifications.
Move the throttle lever to its fully opened position, and increase the dynamometer load until the engine speed is
at torque peak rpm. Operate the engine at this speed and load level for 10 minutes or until the blow by becomes
stable within specifications.
Check all gauges, and record the data.
Reduce the dynamometer load until the engine speed increases to the engine’s rated rpm.
Operate the engine at rated rpm for 5 minutes.
Check all gauges, and record the data.
Remove the dynamometer load completely, and operate the engine at 800 rpm for 3 to 5 minutes. This period will
allow the turbocharger and other components to cool.
Shut off the engine.
Engine Dynamometer Test- Performance Check
Make sure the air compressor will be unloaded during the performance check.
Apply regulated air pressure of 655 kPa (95 psi] to the air compressor unloader (1 ).
Crank the engine and observe the oil pressure when the engine starts. If the engine fails to start within 30 seconds,
allow the starter motor to cool for 2 minutes before cranking the engine again.
Engine lubricating oil pressure must be at least 69 kPa (10 psi) at approximately 700 rpm.
Make sure the engine is at operating temperature (71.1 ยฐ C (160ยฐF] minimum coolant temperature).
Move the throttle pedal to 1DO-percent throttle. Adjust the dynamometer load until the engine maintains the rated
rpm.
Allow the readings to stabilize. Read the horsepower.
NOTE: The horsepower reading will not be accurate if the lubricating oil temperature and fuel temperature are not
within specifications.
Check all gauges, and record the data.
Move the throttle lever to its fully opened position, and increase the dynamometer load until the engine speed is
at torque peak rpm. Allow the readings to stabilize. Read the torque. Check all of the gauges and record the readings.
Remove the dynamometer load completely.
Operate the engine at idle speed for 3 to 5 minutes. This will allow the turbocharger and other components to cool.
NOTE: Idle periods longer than 5 minutes are to be avoided.
Shut off the engine after the cool down period.
Remove all test instrumentation.
Remove the engine from the dynamometer.
NOTE: If the engine is to be stored temporarily and does not have permanent-type antifreeze, it is necessary to
drain all coolant.
