MAN Engine Rebuild and Repowering Services

OEM-Trained Engineers

30% Faster
Turnaround Time
vs. OEM
Benchmark

30% Cost Reduction
with technology,
maintaining
reliability until the
next overhaul

Timely
Deployment
(Access to
Multiple
PRs & CDC)

Comprehensive
Support On-site,
Off-site, Remote,
including
Riding Squad

12-Month
Workmanship
Warranty

Access to Specialized
Tools such as Chris
Marine Cylinder Liner
Honing, Valve Seat
Machining Tool

Adherance to
OEM Standards

Detailed
Work Completion
Report

Home » ARM » Repair Overhaul » MAN Engine Rebuild and Repowering Services

Neptunus Power Plant Services is an independent service provider and supports ship owners and operators of MAN engines and propulsion system by providing compatible spare parts and maintenance solutions. Neptunus is not affiliated with Everllence (formerly MAN Energy Solutions).

MAN engine rebuild ensures reliability, performance, and long-term value for operators who need to restore their engines to optimal working condition. With almost three decades of service experience and a team of more than 27 highly skilled engineers, we have honed our expertise in overhaul and repair operations across a wide range of marine vessel projects. A rebuild offers a cost-effective path forward, as replacing the engine is significantly more expensive and not recommended when a professional rebuild can deliver full performance restoration.

The overall MAN engine rebuild cost varies based on component condition, hours of operation, and the scope required, but customers consistently benefit from predictable savings and extended engine life. Neptunus provides complete MAN engine repowering and rebuilding solutions designed to enhance performance while minimizing operational downtime. Our services support industries such as marine, oil & gas, power generation, defence, and industrial sectors, ensuring every rebuilt MAN engine meets stringent performance and durability standards.

Disclaimer: Neptunus is an independent spare parts and service provider. MAN is a trademarks of MAN Energy Solutions.

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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

MAN Engine Rebuild Services by Neptunus

1. Component-Level Rebuilds:
Precision repair of MAN engine and its individual components such as cylinder heads, turbochargers, fuel pumps, connecting rods, pistons, liners, lube oil pumps, and cooling water pumps. All components are inspected, machined, calibrated, and bench tested before installation.
2. Sub-Assembly Rebuilds:
Rebuilding core modules such as power packs, cylinder units, camshaft systems, turbocharging units, and fuel injection systems. This ensures quicker turnaround and optimized reliability while minimizing downtime.
3. Complete Engine Rebuilds:
A full overhaul and restoration of the MAN engine to OEM performance specifications. This includes disassembly, crack detection, machining, reconditioning, dynamic balancing, testing, and recommissioning performed by expert engineers.

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Our Portfolio Spans These MAN Engine Models

MAN L+V48/60CR	MAN L21/31	MAN L+V32/44CR	MAN 12V28/33D
MAN PA6 B OG	MAN 16 V28/33D	MAN V28/33D STC	MAN 20 V28/33D
MAN L27/38	MAN 12 PA6 BOG	MAN 16 PA6 BOG	MAN 18 PA6 BOG

Beyond your MAN Engine Rebuilt Services

At Neptunus, we are dedicated to forming enduring partnerships with our clients by offering asset reliability solutions that go beyond simple MAN engine rebuilds. Our focus is on long-term strategies tailored to your specific needs, rather than short-term fixes. We carefully analyze your genuine requirements and provide customized spare parts.

By leveraging advanced technology, we deliver cost-effective and sustainable solutions designed to maximize the longevity and performance of your Caterpillar engine. Our proprietary engine condition monitoring system, approved by both ABS and IRS, along with our comprehensive in-house oil quality management systems, includes real-time oil condition monitoring system and a continuous kidney loop filtration system.

These innovations have significantly benefited our clients. Here’s how we assist our customers:

To detect the defects early to prevent unexpected failures
Helps to know current condition of engine parts like vibration damper, mount , piston rings, fuel pump, injectors, valves, and cylinders
Prolong spare part life by extending lube oil life
Reduced manual inspections with continuous real-time monitoring
Lower maintenance costs through timely interventions
Environmental compliance is achieved through optimized resource usage and reduced waste

If you want to reach similar goals for your organization, schedule a “Discovery Call” with our specialists to see how we can assist you.