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Project

Breakdown Maintenance & Troubleshooting of EMD 710G Engine

Table of Contents

Background

Industry
Marine
Solution
EMD Emergency
breakdown Repair
Services
Make & Model
EMD
L20-710G7B
Asset
Multi Purpose
Offshore Vessel

Summary About The Project

The project involved detailed inspection and troubleshooting of the Port Main Engine, focusing on identifying the root cause of oil leakage in the scavenging area.

Neptunus engineers executed camshaft gear train breakdown maintenance, inspected all critical engine systems, and replaced defective components where required.

Following completion, the engine underwent a 7-hour load trial, during which all operational parameters remained within OEM limits. No turbocharger oil leakage was observed, and the scavenging area was confirmed clean restoring engine reliability and performance.

Planning

  • Team Composition: Team of Experienced Neptunus Service Engineers
  • Work Scope:
    - Root-cause troubleshooting approach
    - Targeted breakdown maintenance based on engine condition
    - Verification through load trials and performance monitoring

Procedure Carried Out

1. Camshaft Gear Train
  • Breakdown maintenance carried out at 75,088 running hours
  • Inspected for wear, alignment, and lubrication condition
2. Pistons & Rings
  • All piston crowns and rings inspected
  • Found in satisfactory condition with no abnormal wear
3. Crankcase & Liners
  • All crankcase doors opened
  • Liners inspected and confirmed to be in good operational condition
4. Scavenging System
  • Scavenging areas on both Left Bank and Right Bank inspected
  • No abnormal oil accumulation found post-maintenance
5. Turbocharger & Air System
  • Compressor impeller and air flange opened and inspected
  • Oil traces noted near aftercooler inlet and scavenge manifold
  • Root cause traced to turbocharger soot/felt filter choking, restricting airflow
6. Exhaust System
  • Exhaust manifold and screen adapter checked
  • Found in satisfactory condition
7. Air Coolers
  • Right Bank and Left Bank air coolers inspected
  • No fouling or oil carryover detected
8. Valve Gear
  • STBD main engine exhaust valve bridge assemblies replaced
9. Operational Testing
  • Cylinder pressure test could not be conducted due to tool unavailability
  • Engine operated on 7-hour load trial
  • All parameters including lube oil pressure, fuel oil pressure, exhaust temperatures, and RPM remained within normal limits

Recommendations

The investigation confirmed that oil leakage likely originated from the turbocharger, occurring intermittently when the soot/felt filter became choked and restricted airflow. After filter replacement, no further leakage was observed.
  • Frequent cleaning or timely replacement of turbocharger soot/felt filters
  • If oil leakage reoccurs, replacement of the turbocharger cartridge is advised

Conclusion

Neptunus successfully completed condition-based troubleshooting on the EMD L20-710G7B Port Main Engine, accurately identifying the source of oil leakage and restoring normal engine operation. A 7-hour load trial confirmed stable parameters and reliable performance, reinforcing Neptunus’ expertise in delivering dependable Marine Engine Repair Service for offshore vessels.

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