Trouble Shooting and Treatment of Common Failures of Cummins Diesel Engine

Cummins Diesel Engine-Causes of a lot of smoke when accelerating

1. The air intake is not smooth. Treatment: Check the filter, pipe and turbocharger. The turbocharger should be clean and free of dirt. Be sure to make the turbocharger impeller rotate flexibly.

2. Exhaust back pressure is too high. Treatment: Under load, check and correct the exhaust back pressure.

3. In areas with hot climates or high altitudes, the air is thin. Treatment: Weather conditions have an impact on diesel engines. Thin air should reduce the load.

4. Air leakage between the air filter and the diesel engine. Treatment: Check all pipe clamps, joints and gaskets. Re-tighten.

5. The turbocharger compressor is dirty. Treatment: clean or replace the turbocharger, check whether there is dirt in the turbocharger.

6. The fuel drain valve is blocked. Treatment: Check whether the pipeline is blocked and unblock the pipeline.

7. The fuel drain pipe is blocked. Treatment: Check whether the pipe is blocked and unblock the pipe.

8. The air-fuel ratio controller (AFC) bellows barometer is faulty. Check whether the barometer is damaged, whether the deaeration rail pressure is adjusted too high, whether the plunger is stuck, whether the return valve is faulty, whether the fuel enters the intake pipe, etc., and EMAC negotiates repair or replacement.

9. Air intake pipe or exhaust pipe gasket leaks Treatment: check or replace the inlet/exhaust pipe gasket.

10. The fuel injection hole of the fuel injector is blocked. Treatment: Clean the fuel injector and fuel injection chamber, negotiate with EMAC to replace and re-adjust.

11. The size of the fuel injection chamber of the fuel injector is wrong. Treatment: negotiate with EMAC to replace and re-adjust the fuel injector.

12. The fuel injection chamber of the fuel injector is broken. Treatment: Remove the fuel injector and fuel injection chamber. Negotiate with EMAC to replace the broken fuel injection chamber and adjust the fuel injector.

13. The oil pump is not calibrated correctly. Treatment: re-calibrate.

14. The air-fuel ratio controller (AFC) is not calibrated correctly. Treatment: re-adjust accurately.

15. The flow rate of the injector is incorrect. Treatment: Check the O-ring of the injector, the fuel injection chamber, the plunger filter and the flow rate of the injector, negotiate with EMAC to replace the damaged parts, and re-adjust.

16. Sealing gasket leaks. Treatment: Perform a pressure check to find out the leaking cylinder. Consult with EMAC for replacement and repair.

17. The valve is leaking or adjusted incorrectly. Treatment: Check for leaks and readjust the valve.

18. Camshaft lobe is worn or damaged. Treatment: check the wear and tear, negotiate with EMAC to replace the camshaft.

19. Incorrect valve and fuel injection timing. Treatment: Re-adjust the valve timing and fuel injection timing.

20. Cylinder liner or piston is worn or scratched. Treatment: check and measure or negotiate with EMAC for replacement and repair.

21. The injector needs to be adjusted. Treatment: Clean and adjust as needed. Check the injector chamber for wear and cracks. Whether the plunger tip is faulty. Replace or repair, readjust.

22. The push rod or cam follower cover is broken or bent. Treatment: If it is damaged, consult with EMAC to replace the push rod and cam follower cover.

23. The rail pressure switch (MVT) is disconnected. Treatment: The diesel engine deflagration pressure is low. The solenoid is out of order, repair it or negotiate with EMAC for replacement.

24. MVT electromagnet is out of order. Treatment: Check the injection hole, gasket, O-ring and filter, etc. Replace or repair.

25. MVT piston and frame seals are damaged. Treatment: Check air pressure, pistons and seals, and recalibrate.

26. Pneumatic solenoid valve screw (MVT) is not tightened. Treatment: Check whether the air pressure is correct and whether there is any disconnection. Repair and tighten the screws.

27. The plunger of the pneumatic solenoid valve stays in the hysteresis position (MVT). Treatment: improper air pressure, disconnection or damage to the electromagnet. repair.

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