Operation & Maintenance Manual for WP7 Euro Ⅵ Vehicle Diesel Engine 3.11 Loud noise 17 Causes Troubleshooting 1. Poor fuel quality Replace the fuel 2. Cooling water has low temperature Check the thermostat or replace it if necessary 3. Wrong valve timing or injection timing Adjust 4. Injector nozzle has poor atomization Check and repair 5. Injection pump injects too much oil Check and adjust (by specialized operator) 6. Shock absorber is damaged Check if the absorber is damaged; check the connecting bolts and replace them if necessary 7. The valve has leakage or improperly adjusted Disassemble the valve and adjust 8.
Too large gap between gears or some tooth is broken Check and replace the damaged parts 9. Cylinder liner or piston is worn or scuffing Check, repair or replace 10. Push rod is bent or broken Replace 11. Piston ring is broken or worn Replace 12. Bearing is worn seriously Replace 13. Excessive crankshaft thrust bearing clearance Replace 14. Main bushing is not concentric Replace 15. The crankshaft is not coaxial with the main shaft of driven parts Check the bolts on the mounting bracket and repair 16. Parts are worn seriously, requiring an overhaul Overhaul 17. Turbocharger surges Remove dirt and blockage in the compressor flow passage and accumulated carbon in the exhaust path 18.
Sealing ring of the turbocharger is burnt Replace 19. Turbocharger bearing is damaged; moving part rubs against fixed part Replace 20. Foreign matters come into the turbine or the compressor impeller of turbocharger Replace