• Crankshafts are critical components in engines used across industries

• Wear and damage affect engine efficiency and reliability

• Precision machines are required to restore crankshaft geometry

• Modern industries demand portable, high-accuracy grinding solutions

What is a Crankshaft Grinding Machine?

• A specialized machine used to grind and restore crankshaft journals and crankpins

• Ensures dimensional accuracy and surface finish

• Additionally, designed for both workshop and onsite (in-situ) applications

• Essential for engine rebuilding and maintenance

Role of Crankshaft Grinding Machine Manufacturers

• Design and develop precision-engineered machines

• Ensure durability and performance under industrial conditions

• Provide machines capable of handling various crankshaft sizes

• Focus on innovation for portability and ease of use

Key Features of Modern Crankshaft Grinding Machines

• Portable Design—Easy to transport and install onsite

• High Precision—Maintains OEM tolerances

• Versatility—Suitable for marine, power, and industrial engines

• Compact Structure—Works in confined engine spaces

• User-Friendly Operation—Quick setup and minimal downtime

Onsite Capability – A Major Advancement

• Machines designed for in situ crankshaft grinding without removing the crankshaft

• Reduces dependency on workshop-based repairs

• Ideal for remote, offshore, and heavy industrial environments

• Enables faster repair cycles and operational continuity

Advantages of Using Advanced Grinding Machines

• Improves crankshaft life and performance

• Ensures precise alignment and finish

• Reduces repair time significantly

• Minimizes operational costs for businesses

• Supports preventive and corrective maintenance

R A Power Solutions – Leading Manufacturer

• Trusted manufacturer of crankshaft grinding machines

• Over four decades of engineering expertise

• Machines designed for onsite and heavy-duty applications

• Proven performance across global industries, including South Africa

• Continuous innovation to meet modern industrial requirements

Applications Across Industries in South Africa

• Marine engines and the shipping industry

• Mining and heavy equipment

• Power generation plants

• Oil & gas sector

• Industrial manufacturing units

Why Businesses Choose the Right Manufacturer

• Reliability and machine performance

• Precision and consistent output

• Long-term durability

• Technical support and expertise

• Ability to handle complex grinding requirements

For more information regarding crankshaft grinding machine manufacturers and onsite crankshaft grinding solutions:

Email us at rajshahani@rapowersolutions.com, info@rapowersolutions.com, or call us at +91 9582647131 or +91 9810012383.

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Key Features of the Crankshaft Grinding Machine

1. Portable & Modular Engineering

The machine’s lightweight and modular construction enables quick transportation, assembly, and operation directly at site locations—including confined engine rooms, vessels, offshore platforms, and remote industrial facilities.

2. Wide Grinding Range

With the capability to machine crankshafts from 35 mm to 700+ mm, it supports a broad spectrum of engines used in marine propulsion, diesel power plants, industrial equipment, and heavy machinery.

3. Advanced Vibration-Control Technology

Manufactured using specially developed vibration-dampening alloys, the machine ensures exceptional stability during operation. This directly contributes to a superior surface finish and precision, even in the most demanding environments.

4. Micron-Level Accuracy

The machine restores crankpins and main journals to original OEM tolerances. Ovality, taper, and size corrections are executed with high precision, ensuring long-term reliability and smooth engine functioning.

5. Combined Grinding & Polishing System

Grinding and polishing are performed in the same setup without disturbing the alignment. This integrated design saves significant time while delivering consistent journal geometry.

6. Rapid Setup & Alignment

Special fixtures and alignment tools allow the machine to be mounted quickly with perfect axial positioning. This is particularly critical in constrained spaces, as it reduces the overall repair duration.

7. Exceptional Surface Finish

The machine delivers a mirror-like surface suitable for high-speed and high-load-bearing applications, improving lubrication and extending crankshaft life.

How the Machine Operates

(i) Mounting & Fixture Alignment

Custom brackets are used for precise mounting on the crankshaft.

(ii) Measurement & Diagnosis

Dial gauges and micrometers record journal wear, taper, and ovality.

(iii) High-Precision Grinding

Controlled grinding restores the exact journal size and geometry.

(iv) Polishing

The same machine produces a smooth, bearing-ready finish.

(v) Final Inspection

Journal dimensions are rechecked to confirm OEM tolerance compliance.

Operational Advantages

Minimal Downtime

Repairs are completed onsite, significantly reducing engine outage time.

Major Cost Savings

Eliminates logistics, crane usage, transportation, and external workshop costs.

Extends Engine Life

Accurate restoration ensures long-term durability and prevents premature engine failure.

Ideal for Any Environment

Marine vessels, offshore rigs, industrial plants, and remote installations benefit from its portability and precision.

RA Power Solutions: Global Leader in Crankshaft Grinding Technology

RA Power Solutions Pvt. Ltd. is the designer, manufacturer, and worldwide supplier of the advanced Onsite Crankshaft Grinding Machine. With over four decades of experience in engine repair and rotating machinery services, the company has become a trusted name across the marine, industrial, and power sectors.

Why RA Power Solutions Stands Out

1. In-House Design & Manufacturing

The Crankshaft Grinding Machine is designed and built entirely by RA Power Solutions, ensuring:

• superior metallurgy

• vibration-free performance

• long operational life

• precise grinding accuracy

2. Global Onsite Service Expertise

Their team has performed 10,000+ onsite crankshaft grinding and repair jobs across more than 90 countries, giving them unparalleled field experience.

3. Continuous Innovation

The machines are regularly upgraded based on real-world feedback from:

• marine engineers

• power plant operators

• industrial maintenance teams

Each new generation offers improved efficiency, portability, and accuracy.

4. End-to-End Support

RA Power Solutions provides:

• machine supply

• operator training

• spare parts

• onsite grinding services

• technical consultancy

5. Proven Track Record

Widely used in:

• marine main engines (MAK, MAN, Wärtsilä, Yanmar, etc.)

• diesel generator sets

• cement and steel plants

• petrochemical facilities

• offshore platforms

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RA Power Solutions manufactures crankshaft grinding machines ranging from 60 mm to 700 mm in diameter. We designed the crankshaft grinding machine in technical collaboration with a leading Italian company. The Crankshaft Grinding machine is portable, lightweight, and easy to operate. The technicians can transport the machine as luggage to any part of the world.

Conventional Bench-Type Crankshaft Grinding Machines Are Outdated For the Repair of Crankshafts

In olden times, in case of any breakdown in the crankshaft, the only option was to remove it from the ancient block and send it to the designated workshop, duly packed for repair. The whole process was not only time-consuming, but also very expensive for the complete engine to be disassembled. Additionally, the crankshaft could potentially sustain damage during transportation.

Primary Features of the Innovative Onsite Crankshaft Grinding and Polishing Machine

(i) The State-of-art onsite grinding machine replaced the obsolete heavy-duty bench-type crankshaft grinding machine.

(ii) The onsite crankshaft honing and polishing machine is portable, enabling operators to conveniently transport it aboard a vessel, to a power plant, or to any installation globally.

(iii) Simple to operate and straightforward to maintain.

(iv) We developed the onsite crankshaft grinding and polishing machine to ensure precise control of tolerances in taper, ovality, surface finish, runout, and other parameters. All adhere to the manufacturer’s specifications.

(v) Our workshop offers complimentary onsite training.

Assessment of Quality and Reliability in Insitu Crankshaft Grinding Equipment

RA Power Solutions is an ISO-certified organisation, dedicated to maintaining rigorous quality control standards throughout the manufacturing process.

The primary structural component of our insitu crankshaft grinding machine is manufactured from high-grade titanium steel, a material selected for its inherent vibration-dampening properties. This guarantees the seamless and accurate honing and polishing of crankshafts, even during vessel operation. We rigorously inspect each component and continuously refine its metallurgical characteristics using field-testing and performance data from operational environments.
Our in situ crankshaft grinding devices are available at competitive prices, rendering them accessible to shipping companies, power generation facilities, and engine repair establishments. Typically, it takes two to three assignments to recover the initial investment. Eliminate dependence on expensive European services; instead, procure your own equipment and assume complete responsibility for crankshaft maintenance, thereby realizing savings in both time and financial resources.

Introduction of the Crankshaft Grinding Machine by R A Power Solutions:

RA Power Solutions has revolutionised crankshaft repair with its onsite grinding machine. It can grind crankshafts without removing them from the block. Technicians travel worldwide with this portable machine and perform repairs directly onsite.

R A Power Solutions manufactures crankshaft grinding machines up to a diameter of 700 mm and has exported more than 88 machines all over the world.  We offer free onsite training for operating and maintaining the grinding machine. You may participate in the training at our training facility near New Delhi or arrange for our team to conduct the session at your location.

Engine repair companies, shipping companies, and high-capacity power plants widely use our crankshaft grinding machines for efficient and precise engine maintenance. We sold more than a thousand onsite crankpin and main journal grinding machines worldwide. All the machines are performing satisfactorily. References can be provided upon request.

We are executing crankshaft grinding repair services in Bahrain, Kuwait, Oman, Qatar, Saudi Arabia, United Arab Emirates, Vietnam, UK, USA and other countries.

For more information on portable crankshaft grinding machines, crankshaft polishing crankpin machines, onsite grinding of crankshafts, and main journal grinding equipment, please email us at rajshahani@rapowersolutions.com, or info@rapowersolutions.com, or call us at +91 9582647131 or +91 9810012383.

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Certainly, you have read that correctly. No disassembly. There is no shipping available. There is no need to wait for weeks.

What distinguishes RA Power Solutions?

They possess a fleet of in situ crankshaft grinding machines that are portable, compact, and designed to perform precise repairs at your location. This service is available whether you are on a marine vessel in the middle of the ocean or at a power plant that cannot shut down.
These devices accommodate crankshaft diameters ranging from 35 mm to 700 mm. That essentially encompasses the majority of auxiliary and main engines utilized in heavy industry, mining, power plants, and shipping.

Why In Situ Crankshaft Grinding Is a Smart Choice

• No disassembly is required.

• Beware of the antiquated approach that necessitates the complete removal of the crankshaft and its transportation to a workshop.
• The portable machine penetrates the engine block through the inspection window and completes the task immediately.

• Significant time saving

• Repairs that have historically required weeks?
• The team can resolve specific crankshaft issues in as little as 24 hours with RA Power Solutions—prompt turnaround results in minimal downtime.

• Extremely cost-effective

• There are no logistics expenses.
• There is no charge for reinstallation.
• No production revenue was lost while the crankshaft was awaiting its return from the workshop.
• A rapid resolution results in a reduction in expenditures.

• Precision equivalent to that of the original equipment

1. The crankpin is precisely restored to the OEM tolerance through the crankshaft grinding and polishing procedure.
2. The surface quality has been enhanced to 0.2 micron Ra, which translates to smooth AF.
3. It is also possible to polish and refine.
4. Polishing/honing can be performed without the need for full grinding if the crankpin has minor damage or if a surface finish enhancement is required.

Real Results. Real Experience.

This is not a novel concept for RA Power Solutions. For more than 45 years, they have been servicing engines on a global scale, including those in factories, power plants, and ships.
They did not merely perfect the process; they also constructed their own onsite crankshaft milling machine and have already sold over 70 units worldwide.
The most intriguing aspect is that they provide complementary training to the client’s technicians during the project, ensuring that your team is fully informed about the situation.

Why the industry relies on RA Power Solutions

Over 45 years of experience in crankshaft repair
• Portable crankshaft grinding machines for 35 mm to 700 mm shafts
• Precision repair without engine disassembly
• Fast turnaround and global reach
• Technicians trained onsite

Are you prepared to restore your crankshaft without interrupting your operations?

Call/WhatsApp: +91 9582647131, +91 9810012383.

Email: rajshahani@rapowersolutions.com and info@rapowersolutions.com

Refrain from squandering time on obsolete crankshaft repairs. Ensure that your plant remains operational. Continue earning.
Our organization, RA Power Solutions, is committed to your support.

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Features of the Crankshaft Grinding Machine

1. Portable Design:

• Crankshaft grinding machine specifically developed for onsite crank pin grinding and polishing in confined spaces.
• Eliminates the need to remove the crankshaft from the entablature, minimizing downtime.
• Lightweight and Ergonomic:
• We continuously optimize component weight to ensure easy handling and global transportation.
• Designed for operator comfort and convenience during repair operations.

2. High-Quality Construction:

• We build the main body with high-grade titanium alloy for unmatched strength and vibration control.

3. Precision and Performance:

• Capable of maintaining close tolerances of 0.02 mm.
• The crankshaft grinding machine is used even while the vessel is sailing, ensuring uninterrupted operations.

4. Single-Setting Operation:

• Both crankpin and main journal grinding and polishing can be performed in one setup.
• Eliminates the need for multiple adjustments during operation.

5. Versatile Functionality:

• Suitable for honing and polishing when damage is minor, without reducing the crankshaft diameter.
• Effectively removes surface line marks, pitting, and rust to improve surface finish.

6. Complete Supply Package:

• Delivered with all necessary consumables, sufficient to grind or polish one complete crankshaft.

7. Training and Support:

• A senior technician is deputed to the client’s site for comprehensive training.
• Training covers equipment operation, handling, and maintenance.

The Crankshaft Grinding Machine isn’t just portable—it’s precise.

We’re talking accuracy within 10 microns (that’s micrometer-level precision), with surface finishing that complies with international quality standards. It’s lightweight, simple to carry, and super user-friendly.

Technicians don’t need to be hardcore specialists. With a quick 1-week training (yes, literally just a week), they’re able to grind and polish crankshafts like pros.

In Situ Crankshaft Grinding Machine | R A Power Solutions

RA Power Solutions has already delivered 1500+ crankshaft grinding and polishing machines worldwide, powering industries like:

• Marine & shipping fleets
• Repair & maintenance workshops
• Heavy engineering plants

These machines aren’t just tools—they’re profit boosters.
Less downtime means more productivity, which saves more money.

For any information, please email us at rajshahani@rapowersolutions.com, info@rapowersolutions.com, or call us at +91 9582647131 or +91 9810012383.

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Power plant officials were advised to open all the connecting rods and visually inspect the crankpins of the Wartsila 9L20. Damage to crankpin number #09 was reported. On going through the photographs of the damaged crankpin, the radius fillet on both sides of crankpin number #09 was observed to be damaged.

RA Power Solutions‘ two (2) technicians, along with an onsite crankshaft grinding machine, were deputed from our plant in New Delhi. The details of the engine and crankshaft are as follows:

Action Taken by RA Power Solutions to Repair the Crankshaft of Wartsila 9L20 in Madagascar, East Africa

i) RA Power technicians followed a standard inspection protocol, during which the damaged crankpin number 9 was subjected to a dimensional check, crack detection by MPI, hardness check, etc. A pre-inspection report was prepared.

ii) On inspection of crankpin #09, excessive ovality of 0.41 mm was observed against the specified limit of 0.03 mm. The dimensional report is pasted below. Technicians also observed bearing line marks on the crankpin.

iii) RA Power Solutions carried out the repair by undersizing crankpin #09 of the Wartsila 9L20 by 1.00 mm, as the power plant had a 1.00 mm undersized bearing available. The engine was successfully commissioned in the presence of our technicians.

iv) The onsite crankshaft grinding machine, developed and manufactured by RA Power Solutions, is of the latest design and maintains a tolerance within 0.02 mm (20 microns) after grinding. The surface finish achieved is of a very high standard—15 RA value or less—which is highly recommended for ensuring the long life of bearings and crankshafts.

RA Power Solutions offers onsite crankshaft grinding and repair services under a wide range of conditions, whether on a ship at sea or at a power plant/cement plant in a remote location. All crankshaft grinding services provided by RA Power are guaranteed to ensure the satisfactory performance of the crankshaft and diesel engine after repairs.

RA Power Solutions is a well-known company that provides crankshaft repair, machining, and engine overhaul services on site to the marine, industrial, and power-generating sectors all over the world. The company has been in business for more than 45 years and has completed projects in Asia, Africa, Europe, the Middle East, and South America, bringing precision-engineered solutions right to clients’ premises. RA Power Solutions has powerful portable machining machines and a team of highly qualified experts. This means they can respond quickly, make repairs that are cost-effective, and do work that is as accurate as the original equipment manufacturer (OEM) anywhere in the world.

For more information on onsite crankshaft repair, grinding of crankshaft, and crankshaft polishing, please email us at rajshahani@rapowersolutions.com, or info@rapowersolutions.com, or call us at +91 9582647131 or +91 9810012383.

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Quality Standards : RA Power Solutions

The onsite crankshaft grinding executed successfully, meeting all technical and quality standards. As part of our quality assurance process, inspection reports are obtained and duly signed by the vessel’s Chief Engineers. These reports are available upon request and can be shared along with photographs and videos.

Our team is available 24/7 and can mobilize at short notice to any location worldwide. We are committed to minimizing downtime and ensuring smooth and reliable operation of your engines.

Assembly of Crankshaft Grinding Machine on Damaged Crankpin	Onsite Crankshaft Grinding Under Process

RA Power Solutions offers specialized onsite services:

RA Power Solutions has been a world leader in onsite crankshaft grinding and polishing for more than 45 years, serving power plants, shipyards, marine vessels, and engineering sectors globally. We can do insitu crankshaft grinding for diameters up to 700 mm with unparalleled accuracy and efficiency because we have experience with engines of all makes and models.

Serving engines such as MAN B&W 7L23/30H, Daihatsu 6DK20, Hyundai Himsen 9H25/33P, and Bergen Rolls-Royce, among others, our recent projects span important international ports and clients from Sharjah, Dubai, Vietnam, and beyond.

For more details of the onsite crankshaft repair, Crankshaft Grinding Services, In Situ Crankshaft Grinding Machine, or email us at info@rapowersolutions.com or call us at +91-9582647131,+91 9810012383.

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The onsite crankshaft grinding machines are portable, light in weight, and have the following main features:

 The features of the portable onsite crankshaft grinding machine are given as follows:

1. RA Power Solutions Pvt. Ltd. designed, manufactured, and exported the machine worldwide.. We are proud to be the only manufacturer in the world producing centerless, portable, onsite crankshaft grinding machines. Please be aware of counterfeit machines and unauthorized imitations of our products.
2. We have already delivered more than 80 units across the globe. Engine repair workshops, shipping repair companies, diesel-based power plants, and leading onsite crankshaft grinding companies use them.
3. The current machine range of onsite crankshaft grinding machines is from 60–700 mm in terms of the diameter of crankshaft.
4. With our experience of over 45 years in this field, we have been improving the design and metallurgical composition of the parts to make the onsite crankshaft grinding machine light in weight, more efficient, and to improve the overall quality of grinding and polishing of crankshafts.
5. The machine is compact and lightweight. You can carry it as checked-in baggage during travel. This eliminates the need to book the equipment separately in a cargo flight.
6. The machine is operated by a heavy-duty pneumatic turbine motor. Hence, there is no hassle related to voltage variations, frequency fluctuations, or compatibility issues.
7. The machine is supplied as a complete unit, including all accessories. It is ready to operate immediately upon arrival.
8. We offer free training by our senior service engineer at the customer site or at our dedicated training school based near New Delhi.
9. The cost of the machine is affordable and makes it a financially viable option even for crankshaft and engine repair companies.

About RA Power Solutions:

We are a global leader in onsite crankshaft grinding and repair services for crankpins and main journals up to 700 mm. With over four decades of hands-on experience, we are Asia’s most established and trusted company in this field.

We are the original developers and manufacturers of portable onsite crankshaft grinding machines. Our machine design originates from a reputed Italian engineering firm. To date, we have supplied over 80 onsite crankshaft grinding machines across the globe.

In addition to repair services, we also supply the complete range of tools and measuring instruments necessary for crankshaft repairs.

We offer hands-on training programs for client technicians at our in-house training center near New Delhi, India, conducted by our expert engineers. We successfully delivered training sessions to clients from Colombia, Panama, Ecuador, Dubai, Singapore, Bangladesh, Tanzania, and many other countries.

For more details on the onsite crankshaft repair, Crankshaft Grinding Services, or In Situ Crankshaft Grinding, email us at info@rapowersolutions.com, Call at +91-9582647131,+91 9810012383.

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Key Observations by RA Power Solutions Technicians

Intermediate Shaft

1. On removal of the Intermediate Shaft bearing, the excessive damage to the bearing seating area was observed.
2. The Intermediate Shaft bearing, babbitt white metal, was badly stuck on the bearing journal diameter.
3. We removed the white metal from the Intermediate Shaft bearing seating area. We observed an ovality of 0.38 MM. The standard diameter of the Intermediate Shaft Journal is 505.00 MM.
4. Hardness and MPI Tests undertaken and observed within limits.
5. We observed localized damage, bearing line marks, and a rough surface on the Intermediate Shaft Journal diameter.
6. We repaired the Intermediate Shaft Journal diameter using an in situ grinding and polishing machine, maintaining the diameter at 504.00 MM. We reduced the intermediate shaft bearing seating diameter by 1.0 MM.

Repair of Intermediate Shaft Bearing

1. We removed the damaged babbitt white metal Intermediate Shaft bearing from the vessel. We transported it by air over a distance of more than 2,600 KM from Kochi Port, India, to our facility in IMT Manesar near New Delhi.
2. We inspected the damaged bearing. Then we rebabbitted the bearing and machined it to maintain an inner diameter of 504.50 MM. The oil gap was kept as specified in the manual.
3. Our representative hand-carried the bearing back to Kochi Port, India. This step saved time.

Damaged Intermediate Shaft Bearing	Intermediate Shaft Babbitt Bearing Under Machining

Intermediate Shaft Bearing Details

Assembly of Intermediate Bearing and Shaft

1. The bearing assembled by RA Power Solutions Technicians.
2. We checked all the parameters. We carried out the oil-gap measurement and blue matching of the bearing with the Intermediate Shaft.

Intermediate Shaft Bearing Casing	Intermediate Shaft Bearing Under Packing

After Grinding and Polishing of the Intermediate Shaft

We conducted assembly trials and found the performance of the Intermediate Shaft bearing satisfactory. The team completed the job in just eight (8) days.

For more information of  Repair of the Intermediate Shaft and Damaged Intermediate Bearing, intermediate Shaft bearing services, please contact us at rajshahani@rapowersolutions.com or info@rapowersolutions.com or call us at +91 9582647131 or +91 9810012383.

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RA Power Solutions technicians were deployed from New Delhi and boarded the vessel at the Suez Canal. Following are main details of Daihatsu 6DK-20 Crankshaft Repair and engine.

Details of the Inspection of the Crankshaft of Daihatsu 6DK-20 undertaken by Technicians

• During the visual inspection, we found crankpin #6 of the crankshaft damaged. The remaining crankpins were in good condition.
• The hardness of the crankpin was checked and observed on the higher side in some spots.
• After removing the bearing material from the crankpin, we carried out a crack detection test. We observed multiple hairline cracks.
• The crankpin number #6 was subject to dimensional inspection. Against the standard diameter of 170.00 MM. The Minimum diameter observed was 169.26 MM, thus the ovality of 0.74 MM.

The report is pasted below:

SIZE OF CR JOURNAL

Action Taken By RA Power Solutions for the Repair of the Damaged Crankpin

• We initially ground crankpin #6 to a size of 169.00 mm, which is 1.00 mm undersize from the standard diameter.
• Since the crankpin still had ovality and damage line marks, we jointly decided with the Chief Engineer to undersize the crankpin by 2.00 mm. We maintained the final size of the crankpin at 168.00 mm.

Hardness Test of Crankpin	Grinding of Daihatsu DK-20 Crankpin

Supply of Crankpin Undersize Bearing by RA Power Solutions Pvt Ltd

RA Power Solutions technicians carried with them undersized bearings of 1.5 MM/2.0 MM/2.5 MM. The 2.00 MM bearing was retained by the ship staff and the engine was commissioned. The Auxiliary engine as on date is performing satisfactory.

In this case, time was short. RA Power technicians hand-carried a 2.00 mm undersize bearing, which greatly helped the client. The team commissioned the engine within four hours of grinding the crankpin.

Daihatsu 6 DK-20 Crankpin After Grinding to 2.0 mm Undersize	Daihatsu Crankpin After Polishing

RA Power Solutions maintains a stock of 6DK-20 engines, up to 4.00 MM undersize bearings, and have saved number of crankshafts from rejection.

For more information regarding crankshaft grinding services, Daihatsu 6DK-20 Crankshaft Repair please contact us at rajshahani@rapowersolutions.com or info@rapowersolutions.com or call us at +91 9582647131 or +91 9810012383.

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