Faulty Exhaust Brake Cylinder
To determine if a faulty exhaust brake cylinder is causing excessive black or gray smoke, check exhaust brake cylinder for full movement of travel by applying regulated air to cylinder.
- If movement of travel is not full, replace the exhaust brake cylinder; refer to "9.12.1 Test Engine for Replaced Exhaust Brake Cylinder" . Verify replacement of exhaust brake cylinder corrected the excessive exhaust smoke concern; refer to "9.12.1 Test Engine for Replaced Exhaust Brake Cylinder" .
- If full movement of travel is obtained, refer to "9.13 Faulty Constant Throttle Valve Solenoid" .
Test Engine for Replaced Exhaust Brake Cylinder
Perform the following steps to determine if the replaced engine brake cylinder 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 constant throttle valve; refer to "9.13 Faulty Constant Throttle Valve Solenoid" .
|EPA07 MBE 900 DDEC VI Troubleshooting Guide - 6SE580|
|Generated on 10-13-2008|