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CATERPILLAR (CAT) ENGINE
REPAIR & OVERHAUL
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

Caterpillar engine repair services by Neptunus are backed by over three decades of industry expertise. Our team’s deep knowledge of CAT engines ensures reliable, top-tier solutions that maximize performance and operational efficiency. With a team of 27+ highly skilled engineers, including 6+ dedicated Caterpillar engine experts, Neptunus is equipped to handle even the most complex cat engine repair and overhaul jobs. Our engineers provide on-site support for overhauls, fault diagnosis, commissioning, and alignments, both offshore and onshore vessel, or perform engine repairs at our in-house workshop in Navi Mumbai. We can also join the riding squad on vessels to ensure seamless operations during transit.

An overhaul of a Caterpillar engine is a comprehensive process aimed at restoring the engine’s original performance and extending its operational life. This includes complete dismantling, thorough inspection, cleaning, and precise reassembly of components, with worn or damaged parts reconditioned or replaced as required. In addition, CAT engine emergency repair services on board vessels address unexpected engine failures by deploying skilled engineers for rapid diagnosis and on-site rectification, even under challenging operational conditions. All activities are followed by rigorous testing to ensure safe, reliable, and optimal engine performance, making these services a cost-effective alternative to engine replacement while minimizing vessel downtime.

Neptunus has successfully completed over 300 caterpillar repair projects establishing itself as a trusted partner for businesses across India, South Asia, the Middle East, Europe, and Africa. With a strategic presence in major Indian dry-docking hubs, Mumbai, Cochin, Goa, Kolkata, Chennai, Visakhapatnam, and Haldia, we ensure accessible, timely, and reliable support for all our clients. All completed repairs are backed by a six-month warranty, reflecting our commitment to quality and customer satisfaction.
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

Testimonials

Working with Neptunus has been an enriching experience. We had a major overhaul requirement on one of our vessels, to be done within a very short time as the charter was not ready to wait for a longer period. Neptunus readily responded to the situation and performed the major overhaul on two C18 engines. The job was completed to our satisfaction in five days, which saved us at least three days of loss of revenue amounting to nearly 8-10 lac rupees.
QUOTE-MARK
Head TechnicalOffshore Supply Vessel Owner in India
We would like to appreciate your team Neptunus for the excellent job i.e.; carried out MOH job on Caterpillar Main engine #4 on board. With procedures as per the Manufacturers std and completed in time , without any incidents , injuries and damages to property. Completed the job with safe work practices and safely. It is due to their persistent hard work, good attitude and behaviour , we are indebted to appreciate their good job.
QUOTE-MARK
Chief MechanicOne of the biggest drilling rig operator in India

Challenges in CAT Engine Repair & Overhaul Services

  • Lack of Skilled Manpower:
    Finding qualified technicians with in-depth knowledge of CAT engines can be a significant hurdle.
  • Availability of Manpower:
    Scheduling marine and Auxiliary Engine Repair services during crucial operational windows requires readily available specialists.
  • Technical Expertise for Scoping Work:
    Accurately assessing the repair scope for CAT engines is essential for efficient project execution and cost optimization.
  • Rapid Turnaround:
    Minimizing downtime is paramount to maintaining operational continuity in cat engines.
  • Cost-Effective Solutions for Repairs and Spare Parts:
    Balancing the need for high-quality Marine Engine Repair with budget constraints can be a delicate balance, requiring strategic cost optimization strategies.
  • Ensuring Optimal Performance and Reliability after Repairs:
    Comprehensive testing and quality assurance measures are necessary to guarantee that repaired engines perform optimally and maintain their reliability, adding to the complexity of the repair process.

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CAT Engine Repair Services by Neptunus

Neptunus offers comprehensive Caterpillar engine service designed to ensure reliability, performance, and long-term asset protection. With strong technical expertise and field-proven processes, these services support marine, oil & gas, and industrial operations worldwide.
  • CAT Engine Emergency Repair:
    Rapid-response emergency Caterpillar diesel engines repair services are provided to minimize downtime and restore engine operations at the earliest. Experienced engineers are deployed at short notice to diagnose failures and carry out critical repairs on-site or afloat. The focus remains on safe, reliable, and efficient engine recovery under time-sensitive conditions.
  • CAT Engine Overhaul (MoH & ToH):
    Major Overhaul (MoH) and Top Overhaul (ToH) , cat engine services are executed in line with Caterpillar OEM standards and best maintenance practices. Each overhaul includes detailed inspection, precise component replacement, and performance verification. This ensures extended engine life, improved efficiency, and reduced long-term operating costs.
  • CAT Engine Troubleshooting Services:
    Advanced troubleshooting services help identify the root cause of performance issues, alarms, and operational abnormalities. Proven diagnostic methods are applied across fuel, lubrication, cooling, combustion, and control systems. This systematic approach prevents recurring failures and unplanned shutdowns.
  • CAT Engine Inspection Services:
    Comprehensive inspection services deliver a clear evaluation of engine condition and operational readiness. Visual checks, dimensional measurements, and performance assessments support maintenance planning and regulatory compliance. Detailed reports provide practical recommendations to mitigate risk and avoid unexpected breakdowns.
  • CAT Engine Rebuild Services:
    Complete CAT engine rebuild services are carried out to restore CAT engines to optimal operating condition. Controlled processes, precise tolerances, and stringent quality checks are followed throughout the rebuild. The outcome is enhanced reliability, improved performance, and long-term operational confidence.

Expertise in Repair & Overhaul Services for CAT Engine Model

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

Projects We Have Done

Revenue Generation of ~$4 MN over three months Enabled Under Severe Time Constraints

Industry Segment:
Oil & Gas
Customer:
Rig Operator in Dubai
Equipment/Process:
CAT Engines
Arm Solution:
Major Overhaul Services
Read More

Remote Support During Lockdown
Saved ~$37,000 for a
Supply Vessel

Industry Segment:
Marine
Customer:
Offshore support vessel owner in India
Equipment/Process:
CAT Engines
Arm Solution:
Remote Maintenance Services
Read More
View More

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CAT Engine Repair Procedure Followed by Our Expert Engineers

A Caterpillar engine overhaul is more than just fixing an engine. It is a complete process designed to restore your Caterpillar engine’s performance and extend its operational life. Here’s what it involves.
  • Detailed Evaluation:
    Our team conducts a thorough assessment of your CAT engine to identify worn or damaged components and determine the precise scope of the CAT diesel repair.
  • Disassembly and Inspection:
    We carefully dismantle the CAT engine and inspect each part to ensure nothing is overlooked. This step is critical for any CAT diesel engine repair services.
  • Parts Reconditioning or Replacement:
    Worn components are either reconditioned or replaced with high-quality parts to restore optimal functionality and reliability.
  • Reassembly and Final Testing:
    After meticulous reassembly, the CAT engine undergoes rigorous performance testing to ensure it operates like new, giving you peace of mind that your service caterpillar engine work is effective

When Does Your CAT Engine Need an Overhaul?

Knowing when your CAT engine requires attention can save costs and prevent unexpected downtime. Here are the key signs that indicate it is time for a CAT diesel repair or Caterpillar diesel repair.
  • Reduced Performance:
    If your CAT engine is not delivering its usual power or efficiency, it may be time for a CAT engine overhaul.
  • Increased Fuel or Oil Consumption:
    Higher than usual consumption can indicate worn parts, and timely Caterpillar engine service can prevent further damage.
  • Unusual Noise or Vibration:
    Strange sounds or excessive vibrations are warning signs that your CAT diesel engine repair is needed.
  • High Operating Hours:
    CAT Engines that have been in operation for extended periods often require a scheduled Caterpillar diesel engine repair to maintain reliability.

Beyond Repair & Overhaul for Your CAT Engine

At Neptunus, we prioritize building long-term strategic partnerships with our clients rather than just completing short-term projects. Our Asset Reliability Solution involves providing tailored solutions by deeply understanding their needs and identifying our roles in achieving their larger operational efficiency goals. We address maintenance challenges using the latest and most advanced technology at our disposal, ensuring cost-effectiveness, reliability, and sustainability.

Today, through the use of our proprietary, dual-class (ABS and IRS) approved Engine Monitoring System and our comprehensive in-house Oil Quality Management Solution that includes Real-Time Oil Condition Monitoring Sensor and in-depth Kidney Loop Filtration System, we’ve delivered significant benefits to our clients:
  • To detect the defects early to prevent unexpected failures.
  • Helps to know the current condition of engine parts like vibration dampers, mounts, piston rings, fuel pumps, 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 through optimized resource usage and reduced waste.
If your company aims to achieve similar results and optimize your operations, schedule a “Discovery Call” with our experts to explore how we can assist you on your journey.
In addition to our Cat engine services, we specialize Niigata diesel engine repair, providing a complete suite of solutions for the marine industry. Our machine repair services encompass a wide range, including ship niigata engine repair propulsion systems, and genset repair. With our expert team, we ensure top-notch service and reliability for all your machinery needs, from engines to propulsion systems and more.

Related Engine Brands For Which We Provide Repair & Overhaul Service

Beyond its expertise in CAT engine repairs, Neptunus Power is renowned for its exceptional Repair & Overhaul Services for Niigata Engines, along with a wide range of other leading engine brands. Explore the full list of brands we service below:
EMD Engine
Repair & Overhaul
Services
Read More
Yanmar Engine
Repair & Overhaul
Services
Read More
Wartsila Engine
Repair & Overhaul
Services
Read More
MAN Engine
Repair & Overhaul
Services
Read More
MTU Engine
Repair & Overhaul
Services
Read More
Bergen Engine
Repair & Overhaul
Services
Read More
Daihatsu Engine
Repair & Overhaul
Services
Read More

FAQs

Yes, a CAT engine can be repaired. At Neptunus, we offer CAT engine repair services, backed by 28 years of industry expertise. Our skilled engineers are equipped to handle even the most complex repair scenarios, ensuring optimal performance and reliability.
CAT engine failure can be caused by various factors, including poor maintenance, inadequate lubrication, overheating, fuel contamination, or mechanical issues. Regular inspections and maintenance are essential to prevent these issues.
Signs of a bad CAT engine may include unusual noises, decreased performance, excessive smoke, oil leaks, or warning lights on the dashboard. If you notice any of these symptoms, it’s crucial to have your engine inspected by a professional.
To prevent CAT engine damage, ensure regular maintenance, use high-quality lubricants and fuels, follow manufacturer guidelines, and perform timely inspections. Addressing issues early can help avoid costly repairs and prolong engine life.
Turnaround time for CAT engine repairs varies depending on the complexity of the repair and the availability of parts. At Neptunus, we strive to minimize downtime and offer efficient services to get your engine back in operation as quickly as possible.
We service a wide range of CAT engine models, including:

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

We ensure the quality of CAT engine repairs by utilizing advanced technology, employing highly skilled engineers, and offering a 6-month warranty on completed repairs. Our rigorous testing and quality assurance measures guarantee that repaired engines perform optimally.
The CAT engine overhaul process includes disassembling the engine, inspecting and repairing or replacing damaged components, reassembling the engine, and conducting comprehensive testing to ensure proper functionality. Our experts manage this process with precision to restore engine performance.
The cost of a CAT engine overhaul depends on factors such as the engine model, the extent of repairs needed, and the availability of spare parts. We offer competitive pricing and optimize spare parts lists to balance cost and quality. Click Here to get the best quote for your CAT engine overhaul requirements.
Yes, our condition monitoring solution is compatible with engines of any brand or model, providing in-situ and remote monitoring with a single, non-invasive sensor.
Yes, our condition monitoring solution is compatible with engines of any brand or model, providing in-situ and remote monitoring with a single, non-invasive sensor.

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*The demo link will be shared only if a valid work or company email ID is provided.

Technical Seminar on

Transition from

Planned Maintenance (PMS) to
Condition-Based Maintenance (CBM)

#PMS_to_CBM_forTheChange

  • Date: 13th February 2026
  • Time: Lunch - 13:00 hrs | Seminar - 14:00 hrs onwards
  • Venue: IRS Auditorium, Powai, Mumbai - 400072
Technical Seminar on Transition from PMS to CBM

Organised by

In association with

Leaders run on CBM. Followers wait.
Where do you stand?

Register Now
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*The demo link will be shared only if a valid work or company email ID is provided.