Faulty Exhaust Brake Gate
To determine if a faulty exhaust brake gate is causing excessive black or gray smoke, check exhaust brake valve for freedom of movement.
- If movement is not free, replace exhaust brake gate; refer to MBE 4000 Service Manual) (6SE420, Chapter 7, “Exhaust System – Brake Gate”. Verify replacement of the exhaust brake gate; refer to "9.11.1 Test Engine for Replaced Exhaust Brake Gate" .
- If movement is free, check the exhaust brake cylinder; refer to "9.12 Faulty Exhaust Brake Gate Actuator" .
Test Engine for Replaced Exhaust Brake Gate
Perform the following steps to determine if the replaced exhaust brake gate resolved the excessive exhaust smoke condition:
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.
- Start and run the engine.
- Run the engine at idle under no-load conditions for approximately five minutes, allowing the engine coolant to reach normal operating range, approximately 88-96°C (190-205°F).
- Visually inspect exhaust for excessive smoke.
- If the engine smoke emission appears normal, no further troubleshooting is required. Shut down the engine.
- If the engine exhaust smoke is excessively black or gray, shut down the engine. Check the exhaust brake gate actuator; refer to "9.12 Faulty Exhaust Brake Gate Actuator" .
|EPA07 MBE 4000 DDEC VI Troubleshooting Guide - 6SE568|
|Generated on 10-13-2008|