Symptom Tree t116-011
Cause | Correction |
---|
Air intake system restriction |
Check the air intake system for restriction. Refer to Procedure 010-031. |
![]() |
Exhaust system restriction |
Check the exhaust system for any restrictions. Refer to Procedure 011-009. |
![]() |
Air intake or exhaust leaks |
Inspect the air intake and exhaust systems for air leaks. Refer to Procedure 010-024. |
![]() |
Fuel drain line restriction |
Check the fuel drain lines for restriction. Clear or replace the fuel lines, check valves, or tank vents as necessary. Refer to Procedure 006-012. |
![]() |
Intake manifold pressure (boost) is below specification |
Refer to the Intake Manifold Pressure (Boost) is Below Normal symptom tree. |
![]() |
Fuel grade is not correct for the application or the fuel quality is poor |
Operate the engine from a tank of high-quality fuel. Refer to Fuel for Cummins Engines, Bulletin 3379001. |
![]() |
PT fuel pump rated or no-air fuel pressure is above specification |
Remove the fuel pump and check the calibration. Refer to Procedure 005-016 and the PT Fuel Pump Rebuild and Calibration Manual, Bulletin 3379084. |
![]() |
Fuel rate and fuel pressure are high and intake manifold pressure is okay |
Remove the fuel pump and check the calibration. Refer to Procedure 005-016 and the PT Fuel Pump Rebuild and Calibration Manual, Bulletin 3379084. |
![]() |
Fuel rate is high, fuel pressure is okay or low, and intake manifold pressure is okay |
Remove the injectors and check the calibration. Refer to Procedure 006-026. |
![]() |
Turbocharger oil seal is leaking |
Check the turbocharger compressor and turbine seals. Refer to Procedures 010-040 and 010-049. |
![]() |
Turbocharger wheel clearance is out of specification |
Check the radial bearing clearance and axial clearance. Inspect the turbocharger. Repair or replace the turbocharger if necessary. Refer to Procedures 010-038 and 010-047. |
![]() |
Overhead adjustments are not correct |
Measure and adjust the overhead settings. Refer to Procedure 003-004. |
![]() |
Injector cup is damaged or is not correct |
Check the injector cups for damage and for correct part numbers. Refer to Procedure 006-026. |
![]() |
Fuel rate is low, fuel pressure is okay, intake manifold pressure is high, and ambient air temperature is below 0°C [32° F] |
No corrections are required. This is normal performance at temperatures below 0°C [32° F]. |