Vehicles using OM606.694 engine list:

Engine OM606.694

Symptoms:
- Rough idling and loss of power
- Excessive smoke from the exhaust (black or white)
- Hard starting or failure to start
- Engine knocking or unusual noises
- Oil leaks around the valve cover or injector seals

Diagnosis:
- Check for clogged fuel injectors or faulty injector seals causing leaks
- Inspect the turbocharger for wear or damage affecting boost pressure
- Perform a compression test to assess cylinder health and head gasket integrity
- Examine the timing chain and tensioner for wear or slack causing timing issues
- Look for oil leaks around the valve cover gasket and injector seals
- Scan for any fault codes related to fuel delivery or engine management

Fixes:
- Clean or replace fuel injectors to restore proper fuel atomization
- Replace worn or damaged injector seals to stop oil leaks
- Repair or replace the turbocharger if boost pressure is insufficient or if there is excessive shaft play
- Replace the timing chain and tensioner if timing is off or chain is noisy
- Replace valve cover gasket to stop oil leaks
- Service the fuel filter and fuel pump to ensure proper fuel pressure and flow
- Adjust or replace glow plugs if starting issues persist in cold conditions

Prevention:
- Regularly change engine oil and use the recommended grade to ensure proper lubrication
- Replace fuel filters at recommended intervals to prevent injector clogging
- Use high-quality diesel fuel to reduce injector and combustion chamber deposits
- Periodically inspect and maintain the turbocharger and timing components
- Address oil leaks promptly to avoid engine damage and contamination
- Follow the manufacturer’s maintenance schedule strictly to prolong engine life and reliability