PIN 3767520 - Caterpillar

Probable Causes
Diagnostic codes
Air inlet and exhaust system
Fuel injectors
Aftercooler (if applicable)Recommended Actions
Diagnostic Codes
Connect Caterpillar Electronic Technician (ET) and check for active and/or logged diagnostic codes. Troubleshoot any active diagnostic codes before continuing with this procedure.Air Inlet and Exhaust System
Check for air inlet restrictions and/or leaks. A one degree increase in the inlet manifold temperature will increase the exhaust temperature by approximately three degrees. Check for leaks between the exhaust manifold and the turbocharger. Check for exhaust restrictions.Fuel Injectors
Faulty injectors that deliver too much fuel will increase exhaust temperatures. Connect Cat ET in order to determine if any diagnostic codes for the injector solenoids are present. Perform the "Injector Solenoid Test". Observe that the injector solenoids are being energized on Cat ET. Perform the "Cylinder Cutout Test". Locate the misfiring cylinder. Refer to Troubleshooting, "Injector Solenoid - Test".Aftercooler (if applicable)
Normal intake manifold pressure with high exhaust temperature can be caused by blockage of the fins of the aftercooler core.If the application has an aftercooler, check the aftercooler for correct operation. Check for blockage in the cores of the aftercooler.