3116 and 3126 Truck Engines Problem Exhaust Temperature Too High

Probable Cause(s):

* Air Inlet System Has A Leak
* Exhaust System Has A Leak
* Air Inlet Or Exhaust System Has A Restriction
* Engine Operated In A Lug Condition
* Operating Above Altitude Limits
* Defective Turbocharger

1. Air inlet system has a peak:

Check pressure in the air inlet manifold, or read boost pressure (Boost Pr) on Display Status Screen of electronic service tool. If boost pressure is below normal for a given operating condition, look for loose tubing or piping in the air inlet system or a leak in the ATAAC core. Correct any leaks.
2. Exhaust system has a leak:

Find cause of exhaust leak. Make repairs as necessary.
3. Air inlet or exhaust system has a restriction:

Check air cleaner and inlet piping for restrictions. Remove restriction.
4. Engine operated under heavy load below peak torque rpm:

The engine should be operated between rated and peak torque rpms. If operated for an extended period under heavy load below peak torque rpm, the low coolant rate of flow and low air flow through the radiator may cause overheating. Train drivers in correct engine operation.
5. Operating above altitude limits:

Consult with Fuel Setting And Related Information Fiche specifications for proper operating altitude for engine certifications.
7. Defective Turbocharger:

If turbocharger is equipped with a wastegate, and the wastegate is not operating as it should, excessive boost pressure may be generated resulting in high internal cylinder pressures and high exhaust temperatures. Verify correct wastegate operation, preferably on a dynamometer. If incorrect, replace turbine housing, tubing or turbocharger as needed. There is no field adjustment on wastegate settings.

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