Series 50 – Section 25.6 Faulty Exhaust System

Section 25.6
Faulty Exhaust System

To determine if a faulty exhaust system is causing lack of power, perform the following:‪

1. Test the exhaust system; refer to "21.4 Faulty Exhaust System" .
2. Run the engine speed to full load.
   1. If the exhaust back pressure at full load is less than 3.0 in. Hg (10.1 kPa), check for high inlet air temperature; refer to "25.7 High Inlet Air Temperature" .
   2. If the exhaust back pressure at full load is 3.0 in. Hg (10.1 kPa) or greater, refer to "25.6.1 Engine Exhaust System Resolution" .

Section 25.6.1
Engine Exhaust System Resolution

Perform the following steps to resolve the engine exhaust system:‪

1. Visually inspect the engine exhaust system; refer to OEM guidelines.
2. Repair or replace defective exhaust system components; refer to OEM guidelines.
3. Verify exhaust system resolution; refer to "25.6.1.1 Test the Engine with Replaced Exhaust System" .

Section 25.6.1.1
Test the Engine with Replaced Exhaust System

Perform the following steps to determine if replaced engine exhaust system components resolved lack of power condition:‪

1. Start and run the engine.
2. Test drive the vehicle to ensure lack of power has been resolved.
   1. If no lack of power occurred during the test drive, no further troubleshooting is required. Shut the engine down.
   2. If lack of power occurred during the test drive, shut the engine down. Check for high inlet air temperature; refer to "25.7 High Inlet Air Temperature" .