Vehicles using OM647.961 engine list:

Engine OM647.961

Symptoms:
- Rough idling and loss of power
- Excessive smoke from the exhaust, especially black or blue smoke
- Engine warning light illumination
- Difficulty starting or misfires
- Increased oil consumption or oil leaks

Diagnosis:
- Check for clogged EGR (Exhaust Gas Recirculation) valve causing rough running and smoke
- Inspect turbocharger for wear or failure, as it can cause power loss and smoke
- Examine glow plugs and wiring for proper operation to resolve starting issues
- Perform compression test to detect cylinder wear or head gasket problems
- Look for oil leaks around valve cover gasket and oil cooler seals

Fixes:
- Clean or replace the EGR valve to restore proper exhaust gas recirculation
- Repair or replace the turbocharger if worn or damaged
- Replace faulty glow plugs and repair wiring harness as needed
- Address any gasket failures or worn components found during compression testing
- Replace valve cover gasket and oil cooler seals to stop oil leaks
- Regular oil and filter changes using manufacturer-recommended specifications to maintain engine health

Prevention:
- Use high-quality diesel fuel and change fuel filters regularly to prevent injector and EGR clogging
- Follow scheduled maintenance intervals for oil changes and inspections
- Avoid prolonged idling to reduce soot buildup in the EGR system
- Monitor engine performance and address warning lights promptly
- Ensure cooling system is functioning properly to prevent overheating and gasket damage

By adhering to these diagnostic steps, fixes, and preventive measures, owners of Mercedes Benz E 270 CDI models with the OM647.961 engine can maintain reliable performance and minimize common issues associated with this engine.