The Auxiliary Engine is a vital system onboard marine vessels, supplying electrical power for navigation equipment, cargo systems, lighting, and safety devices. On M.H. THAMRIN, continuous operation under demanding marine conditions can lead to component wear and reduced performance. To ensure safe and efficient vessel operations, a scheduled Auxiliary Engine Overhaul is essential.
This article explains the overhaul of the auxiliary engine on M.H. THAMRIN, covering the scope of work, technical procedures, and operational benefits.
Auxiliary Engine Overhaul is a comprehensive maintenance process that includes dismantling, inspection, repair, and replacement of worn engine components. The objective is to restore the engine’s performance, reliability, and efficiency in accordance with manufacturer recommendations and marine safety standards.
For M.H. THAMRIN, this overhaul ensures continuous and reliable power generation for all onboard systems.
Reasons for Overhaul of Auxiliary Engine
The auxiliary engine on M.H. THAMRIN requires overhaul due to:
- High engine running hours
- Decreased power output
- Increased fuel and lubricating oil consumption
- Abnormal vibration and noise
- Unstable lubricating oil pressure
- Elevated exhaust gas temperature
- Planned Maintenance System (PMS) requirements
Timely overhaul helps prevent unexpected engine failure and operational downtime.
Scope of Work: Auxiliary Engine Overhaul on M.H. THAMRIN
1. Preparation and Safety
- Coordination with ship officers and technical management
- Lock-Out Tag-Out (LOTO) implementation
- Preparation of tools, measuring instruments, and spare parts
- Recording initial engine condition and performance data
2. Engine Dismantling
- Removal of cylinder head assemblies
- Dismantling of fuel injectors and fuel pumps
- Removal of valve mechanisms and rocker arms
- Extraction of pistons and connecting rods
- Inspection of cylinder liners and crankshaft bearings
3. Inspection and Measurement
All components are inspected according to manufacturer tolerances.
Cylinder Head
- Valve and valve seat inspection
- Cleaning of carbon deposits
- Leak testing
Piston and Piston Rings
- Measurement of ring end gap and clearance
- Inspection of piston crown and skirt
Cylinder Liner
- Wear measurement and surface inspection
- Ovality and taper checks
Bearings and Crankshaft
- Bearing clearance measurement
- Journal condition inspection
4. Replacement and Reconditioning
Components found beyond allowable limits are replaced or reconditioned, including:
- Piston ring sets
- Main and connecting rod bearings
- Gaskets and O-rings
- Fuel injector overhaul and calibration
- Valve and valve seat reconditioning
5. Reassembly and Adjustment
- Reassembly of engine components following standard procedures
- Bolt tightening using calibrated torque tools
- Valve clearance adjustment
- Fuel injection timing setting
6. Testing and Commissioning
- Turning gear test and free rotation check
- Engine start-up and no-load operation
- Monitoring oil pressure, cooling temperature, and vibration
- Load testing and performance verification
- Final inspection and documentation
Conclusion
The auxiliary engine overhaul on M.H. THAMRIN is a critical maintenance activity to ensure reliable onboard power and safe marine operations. Through structured dismantling, inspection, component replacement, and thorough testing, the auxiliary engine is restored to optimal operating condition.
Proper overhaul execution supports long-term operational efficiency, safety, and cost-effective vessel management.
