Neptunus Power Plant Services Pvt. Ltd.
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CAT Engine
Rebuild Services

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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 ET Tool
Access to Specialized
Tools such as Chris
Marine Cylinder Liner
Honing, Valve Seat
Machining Tool
Adherence to
OEM Standards
Detailed
Work Completion
Report
View Reports

CAT engine rebuilders play a critical role in restoring marine propulsion engines and generator sets to their original performance and reliability standards. At Neptunus, we specialize in CAT engine rebuild services designed to improve operational efficiency, reduce downtime, and extend engine lifespan. Our rebuilding solutions cover complete overhauls, precision inspection, component restoration, and performance optimisation, ensuring your Caterpillar (CAT) engine delivers dependable operation. Rebuilding your CAT engine is also a cost-effective and sustainable alternative to engine replacement, helping maximise the value of your existing equipment.

We have over three decades of experience in the industry, and we understand the intricate needs of our customers across India, South Asia, the Middle East, Europe, Africa, and beyond. Our team of 27+ highly skilled engineers is dedicated to providing comprehensive Caterpillar engine rebuild services, offering solutions ranging from component-level rebuilds to complete engine overhauls, ensuring reliable and efficient performance for all types of industrial and marine applications.

With strategic presences in key Indian dry-docking zones, including Mumbai, Cochin, Goa, Kolkata, Chennai, Visakhapatnam, and Haldia, we are well-equipped to cater to the diverse requirements of our customers. As an independent Caterpillar engine rebuilder, we take pride in our ability to provide tailored solutions that meet the unique demands of each project.
Disclaimer : Neptunus is an independent spare parts and service provider. CAT and Caterpillar are trademarks of Caterpillar Inc.

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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

Process of CAT Engine Rebuild

  • 1. Inspection/Evaluation:
    The initial step is crucial, involving a meticulous process where we develop a tailored rebuild plan and cost estimate for your engine. This comprehensive evaluation determines the specific needs of your engine.
  • 2. Disassembly:
    Once the rebuild plan is set, your engine will be fully disassembled. Each part will be inspected and measured against our stringent reusability guidelines. Parts that do not meet our high standards will be replaced with new Caterpillar engine spare parts.
  • 3. Reconditioning:
    During the reconditioning phase, critical engine components are repaired, machined, cleaned, or refurbished to restore them to OEM performance standards. This process may include crankshaft polishing, cylinder head refurbishment, liner replacement, turbocharger servicing, and other precision restoration activities beyond a standard CAT engine overhaul.
  • 4. Reassembly:
    Our experienced technicians carefully reassemble the engine using calibrated tools, approved procedures, and genuine spare parts. Every component is installed with precise tolerances and alignment to ensure reliable engine performance and long-term durability.
  • 5. Testing and Validation:
    After reassembly, the engine undergoes comprehensive testing and validation to verify operational performance, safety, and reliability. Parameters such as pressure, temperature, vibration, load response, and overall engine efficiency are checked against manufacturer standards.
  • 6. Handover to Customer:
    Once testing and commissioning are successfully completed, the rebuilt engine is prepared for handover with complete service documentation and inspection reports. We ensure the engine is delivered in optimal operating condition, ready for reliable service onboard or at the facility.

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Caterpillar Engine Rebuild Services by Neptunus

  • 1. Component-Level Rebuilds:
    Rebuild and recondition individual engine components for optimal performance.
  • 2. Sub-Assembly Rebuilds:
    Rebuild and overhaul sub-assemblies, restoring them to like-new condition.
  • 3. Complete Engine Rebuilds:
    Comprehensive rebuild and overhaul of entire Caterpillar engines, ensuring peak performance.

Our portfolio includes CAT engine rebuilds
across a wide range of engine models.

CAT D399 CAT 3406 CAT C15 CAT 3500 A
CAT D379 CAT 3408 CAT C18 CAT 3500 B&C
CAT 3304 CAT 3412 CAT C32 CAT 3606
CAT 3306 CAT C7.1 CAT C27 CAT 3608

Beyond your CAT Engine Rebuilt services

At Neptunus, we are dedicated to forming enduring partnerships with our clients by offering asset reliability solutions that go beyond simple CAT 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.

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FAQs

A CAT certified rebuild involves restoring a Caterpillar engine to its original performance using genuine parts and OEM approved processes, ensuring reliable operation and an extended lifespan.
Caterpillar’s rebuild strategy focuses on comprehensive overhauls that restore engines to like-new condition, including component-level and complete rebuilds, to enhance performance and durability.
The duration varies based on engine complexity, but typically, a CAT engine rebuild can take from a few weeks to months.
Yes, rebuilt CAT engines can last as long as new engines when rebuilt using high-quality parts and processes, and they are thoroughly tested for performance.

Rebuilding a CAT engine requires expertise and precision, making it a complex process that is best handled by experienced professionals like Neptunus.

So, Click Here for your CAT engine rebuild.
The cost of a CAT engine rebuild depends on factors such as engine size, condition, and the extent of the rebuild; a detailed estimate is provided after an initial inspection.
A CAT engine rebuild by Neptunus typically includes inspection, disassembly, reconditioning, reassembly, and testing of all major engine components.
Yes, our rebuilt CAT engines come with a valid 6 months workmanship warranty, ensuring peace of mind and support for any issues that may arise.
This page has been technically reviewed by the engineering leadership team at Neptunus Power Plant Services Pvt. Ltd.
Last Updated: May 2026

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