Faulty Exhaust System
To determine if a faulty exhaust system is causing lack of power, perform the following steps:
- Drill an 11/32 in. hole in the exhaust pipe, 127 - 305 mm (5 - 12 in.) from the turbocharger exhaust outlet.
Note: The tapped hole must be in a comparatively straight area of the turbocharger exhaust outlet.
- Tap the hole to accommodate a 1/8 in. pipe plug. Connect a manometer to the tapped hole.
To avoid injury before starting and running the engine, ensure the vehicle is parked on a level surface, parking brake is set, and the wheels are blocked.
To avoid injury from inhaling engine exhaust, always operate the engine in a well-ventilated area. Engine exhaust is toxic.
- Start and run the engine at idle with a no-load for approximately 5 minutes, allowing the engine coolant to reach normal operating range.
- Install the vehicle on a chassis dynamometer and run the engine speed to full load.
- If the exhaust back pressure at full load is less than 10 kPa (4.0 in. H2 O), check for high inlet air temperature; refer to "17.7 High Inlet Air Temperature" .
- If the exhaust back pressure at full load is 10 kPa (4.0 in. H2 O) or greater, refer to "17.6.1 Engine Exhaust System Resolution" .
Engine Exhaust System Resolution
Perform the following steps to resolve the engine exhaust system:
- Visually inspect the engine exhaust system; refer to OEM guidelines.
- Repair or replace defective exhaust system components; refer to OEM guidelines.
- Verify exhaust system resolution; refer to "188.8.131.52 Test the Engine with Replaced Exhaust System" .
Test the Engine with Replaced Exhaust System
Perform the following steps to determine if replaced engine exhaust system components resolved lack of power condition:
- Start and run the engine.
- Test drive the vehicle to ensure lack of power has been resolved.
- If no lack of power occurred during the test drive, no further troubleshooting is required. Shut down the engine.
- If lack of power occurred during the test drive, shut down the engine. Check for high inlet air temperature; refer to "17.7 High Inlet Air Temperature" .
|MBE 4000 Service Manual - 6SE412|
|Generated on 10-13-2008|