MBE 4000 DDEC VI Troubleshooting – Section 9.10 Incorrectly Adjusted Exhaust Brake Valve

Section 9.10
Incorrectly Adjusted Exhaust Brake Valve

To determine if a misadjusted exhaust brake valve is causing excessive black or gray smoke, perform the following:‪

1. Readjust the exhaust brake gate; refer to MBE 4000 Service Manual) (6SE420, Chapter 7, “Exhaust System – Brake Gate”.
2. Verify the adjustment on the exhaust brake gate; refer to "9.10.1 Test Engine After Adjusting the Exhaust Brake Gate" .

Section 9.10.1
Test Engine After Adjusting the Exhaust Brake Gate

Perform the following steps to determine if the exhaust brake adjustment 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.‪

1. Start and run the engine.
2. 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).
3. Visually inspect exhaust for excessive smoke.
   1. If the engine smoke emission appears normal, no further troubleshooting is required. Shut down the engine.
   2. If the engine exhaust smoke is excessively black or gray, shut down the engine. Check the exhaust brake gate; refer to "9.11 Faulty Exhaust Brake Gate" .