Section 9.11
Faulty Exhaust Brake Valve
To determine if a faulty exhaust brake valve is causing excessive black or gray smoke, check exhaust brake valve for freedom of movement.
- If movement is not free, replace exhaust brake valve; refer to MBE 900 Service Manual (6SE9007), exhaust system chapter. Verify replacement of the exhaust brake valve; refer to "9.11.1 Test Engine for Replaced Exhaust Brake Valve" .
- If movement is free, check the exhaust brake cylinder; refer to "9.12 Faulty Exhaust Brake Cylinder" .
Section 9.11.1
Test Engine for Replaced Exhaust Brake Valve
Perform the following steps to determine if the replaced exhaust brake valve resolved the excessive 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. |
- 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 70-95°C (158-203°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 cylinder; refer to "9.12 Faulty Exhaust Brake Cylinder" .
EPA07 MBE 900 DDEC VI Troubleshooting Guide - 6SE580 |
Generated on 10-13-2008 |