Auxiliary Engine Repair & Overhaul Services

Auxiliary engine services are essential for maintaining the reliability and efficiency of a vessel’s onboard power systems. Auxiliary engines support critical operations such as electricity generation, pumps, compressors, and other vital equipment required for safe vessel operation.

At Neptunus Power we provide comprehensive auxiliary engine repair and overhaul services designed to ensure optimal performance, reduced downtime, and extended engine life.

With over 30 years of marine engineering experience, our team of 27+ highly skilled engineers, including dedicated auxiliary engine specialists, delivers professional repair, troubleshooting, maintenance, and overhaul services for a wide range of marine auxiliary engines.

Our engineers have extensive expertise working with major marine engine manufacturers, including Niigata (OEM), EMD (OEM), Caterpillar, MAN, Wärtsilä and Yanmar. We have successfully completed numerous auxiliary engine repair projects for different vessel types across the marine industry, establishing a strong reputation for technical expertise and reliable service delivery.

Neptunus provides global auxiliary engine service support, assisting vessel operators across major maritime regions including South Asia, the Middle East, Europe, and Africa. Within India, our service teams regularly support vessels in key maritime hubs such as Mumbai, Cochin, Goa, Kolkata, Chennai, Visakhapatnam and Haldia.

Our riding squad of engineering teams can travel worldwide to provide onboard auxiliary engine inspection, troubleshooting, repair, and major overhaul services, helping ship operators minimise operational downtime and maintain efficient vessel performance.

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Why choose Neptunus?

3 Decades of
Service Excellence

Engine & Propulsion
End-to-End Solutions

2500+ Successful Projects Delivered Worldwide

Trusted by 100+
Satisfied Customers

Dedicated Experts to Address Emergencies

Track Record of Job Completion on or Before Planned Timeline

Detailed Post-Service Tests and Sea-Trails to Ensure Quality

Challenges in Auxiliary Engine Repair & Overhaul Services

Main engine repair and overhaul involves working with auxiliary engines that are interconnected with various ship systems. Repairing one component may affect others, requiring careful coordination to ensure all systems work together seamlessly after repairs.

Identifying the exact problem with an auxiliary engine can be challenging. Since these engines power various systems, a malfunction could stem from multiple sources. Thorough diagnostic procedures and testing, as part of Diesel Engine Repairs, are required to pinpoint the issue accurately.

When an auxiliary engine is down for repairs, it can mean a loss of productivity or even a safety hazard. This puts pressure on technicians to complete repairs quickly, which can lead to mistakes. Efficient repair service for auxillary engine, marine engine, Generator Repair processes help minimize downtime while ensuring quality.

Finding replacement parts for auxiliary engines, especially older models, can be difficult and time-consuming. There may not be a large stock of spare parts for auxiliary engines on hand, and ordering them can lead to delays.

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Process of Auxiliary Engine Overhauls

1. Preparation and Pre-Disassembly

We begin by thoroughly reviewing the job order, understanding the reported issues, and referencing the engine’s technical manual. This equips us with the necessary knowledge and procedures.

We conduct a safety briefing, ensuring everyone understands the hazards involved and dons the appropriate Personal Protective Equipment (PPE) like gloves, safety glasses, and steel-toed boots.

We isolate the engine from its fuel, electrical, and cooling systems. We then implement a Lockout/Tagout procedure to prevent accidental energization or startup.

We give the engine a thorough visual examination, documenting any external damages, leaks, or loose components. Photos are often taken for reference during reassembly.

2. Disassembly

We drain the engine oil, coolant, and fuel into designated containers for proper disposal. Oil samples might be taken for analysis to identify wear patterns.

We systematically remove all peripheral components like the radiator, air intake system, exhaust manifold, and alternator. These are tagged and stored securely.

We move on to the top-end by removing the valve cover, rocker arms, and pushrods. This exposes the cylinder head for further disassembly.

Following the manufacturer’s instructions, we carefully remove the cylinder head bolts and lift the head off the engine block. Gaskets and any sticking components are addressed meticulously.

3. Cleaning and Inspection

All disassembled components are thoroughly degreased and cleaned using appropriate solvents and parts washers. This allows for a clear inspection of their condition.

Each component undergoes a meticulous inspection. We check for wear on pistons, rings, bearings, and cylinder liners. Cracks or deformations are diligently looked for. The service manual’s specifications guide our assessment.

We use precision measuring tools and gauges to assess clearances, wear, and tolerances of critical components. This helps determine if parts need replacement or reconditioning.

4. Overhaul and Reassembly

Based on the inspection results, we replace worn-out components with new parts or recondition salvageable ones within manufacturer’s specifications.

If necessary, the cylinder liners might be honed to restore proper surface finish. Certain components, like crankshafts might require machining for rectification.

All old gaskets and seals are replaced with new ones to ensure proper sealing and prevent leaks upon reassembly.

Following the service manual in reverse order, we reassemble the engine. Torque specifications are strictly adhered to for proper fit and function.

5. Finalization and Testing

All previously removed peripheral components like the radiator, exhaust system, and alternator are reinstalled and secured.

Fresh engine oil, coolant, and fuel are added following the manufacturer’s recommended capacities. We perform initial checks for leaks and proper fluid circulation.

The engine’s electrical system is carefully reconnected, ensuring all connections are secure and free of damage.

We follow the manufacturer’s starting procedures and cautiously crank the engine. Once running, we meticulously monitor oil pressure, coolant temperature, and exhaust emissions to ensure proper operation.

Any minor adjustments are made for optimal performance. All replaced parts, measurements, and observations are documented for future reference.

The engine is handed back over to the client, with a detailed report outlining the work performed, replaced parts, and any recommendations for future maintenance.

AUXILIARY ENGINE
REPAIR & OVERHAUL
SERVICES

Introduction

Why choose Neptunus?

Challenges in Auxiliary Engine Repair & Overhaul Services

Process of Auxiliary Engine Overhauls

1. Preparation and Pre-Disassembly

2. Disassembly

3. Cleaning and Inspection

4. Overhaul and Reassembly

5. Finalization and Testing

Marine Engine Brands For Which We Provide Repair & Overhaul Service

AUXILIARY ENGINE REPAIR & OVERHAUL SERVICES

Introduction

Why choose Neptunus?

Challenges in Auxiliary Engine Repair & Overhaul Services

Process of Auxiliary Engine Overhauls

1. Preparation and Pre-Disassembly

2. Disassembly

3. Cleaning and Inspection

4. Overhaul and Reassembly

5. Finalization and Testing

Marine Engine Brands For Which We Provide Repair & Overhaul Service

AUXILIARY ENGINE
REPAIR & OVERHAUL
SERVICES