MBE 4000 DDEC VI Troubleshooting – Section 9.6 Faulty Fuel Nozzle

Section 9.6
Faulty Fuel Nozzle

To troubleshoot the fuel nozzle, on Fuel Injection Troubleshooting. After completing fuel injection troubleshooting, verify that repairs made corrected the excessive exhaust smoke. Refer to "9.6.1 Test the Engine with Replaced Fuel Nozzle" .‪

Section 9.6.1
Test the Engine with Replaced Fuel Nozzle

Perform the following steps to determine if replaced fuel nozzle has resolved the excessive black or gray exhaust smoke condition:‪

PERSONAL INJURY ‪
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.‪

1. Start and run the engine.
2. Run the engine at idle with a no-load condition for approximately five minutes, allowing the engine coolant to reach normal operating range, approximately 88-96°C (190-205°F).
3. Visually inspect exhaust for excessive smoke.
   1. If the engine exhaust emission appears normal, no further troubleshooting is required. Shut down the engine.
   2. If the engine exhaust emission is excessively black or gray, shut down the engine. Check the turbocharger; refer to "9.7 Defective Turbocharger" .