To monitor engine performance correctly, record the following parameters. To limit dynamometer operating
time, instrument the engine or use INSITE electronic service tool to make as many checks as possible.
Record the following common monitor parameters during the test.
Record any additional parameters if troubleshooting a specific problem.
Service Tip : For the INSITE electronic service tool monitored parameter, utilize the INSITE’M electronic service tool “Data-Logging” feature for recording the values during the test.
Tasks IN SITE electronic service tool can monitor (but not limited to):
• Engine speed (RPM)
• Vehicle speed
• Intake manifold air temperature
• Intake manifold air pressure
• Engine coolant temperature
• Fuel rail pressure (commanded and actual).
If equipped:
• Ambient air temperature
• Ambient (barometric) pressure
• Crankcase pressure
• Exhaust gas temperature sensor(s)
• Aftertreatment diesel particulate filter differential pressure sensor.
Tasks requiring separate tools and/or gauges.
• Engine fuel temperature (if needed to correct fuel rate) .
• Fuel inlet restriction. Refer to Procedure 006-020 in Section 6.
• Fuel drain line restriction. Refer to Procedure 006-012 in Section 6.
• Fuel rate. Refer to the manufacturer’s instructions.
• Intake air restriction. Refer to Procedure 010-031 in Section 10.
• Exhaust restriction . Refer to Procedure 011-009 in Section 11 .
• Engine oil pressure. Refer to Procedure 007-037 in Section 7.
• Coolant pressure. Refer to Procedure 008-020 in Section 8.
If the vehicle is equipped with a clutched fan , make sure the fan is locked in the ON position when operating an
engine on a chassis dynamometer for the best results.
If the engine’s ECM controls the ON/OFF function of the fan, use INSITE’M electronic service tool to lock the fan ON
if the unit does not have a manual fan switch.
If the engine’s ECM does not control the ON/OFF function of the fan , refer to the manufacturers instructions.
If performing an engine run-in , avoid long idle periods.
Operate the engine at low idle only long enough (3 to 5 minutes) to check for correct lubricating oil pressure and
any fuel, lubricating oil, water, or air leaks.
If a sudden increase in blow by occurs or if blow by exceeds the maximum allowable limit during any run-in step, return to the previous step and continue the run-in. If blow by does not reach an acceptable level, discontinue the run- in and determine the cause.
