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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The details are as follows:

Crankshaft Repair:

The damaged crankshaft of the DAIHATSU 5DC-17 engine was subject to the following inspection procedure:

• Dimensional inspection for taper and ovality.
• All five crankpins, each with a standard diameter of 145 mm, showed ovality and taper ranging from 0.62 mm to 0.76 mm. Technicians consider this range to be on the higher side.
• Technicians checked the crankpin hardness using a portable calibrated hardness tester. They observed that it remained within the specified limits
• Since an accident damaged the crankshaft, technicians performed crack detection on all crankpins using MPI. They did not find any cracks or abnormalities in the five crankpins.
• On visual inspection, radius radius-filled profile found damaged.
• Technicians checked the crankshaft deflection and observed that it remained within the specified limits.

Crankshaft Grinding:

Based on the initial inspection, our technicians undertook the onsite grinding of all the crankpins.

The crankpin size was reduced from the standard 145 mm to the following:

1. Minimum size after grinding is maintained as 142.98
2. Maximum size maintained after grinding is 143.00

All the parameters were checked during the final inspection, and the crankshaft was found acceptable.

The grinding of DAIHATSU 5DC-17 engine crankpin having a standard diameter of 145 mm and bearing with of only 64 mm was a challenge mainly because in this particular model of DAIHATSU 5DC-17 engine, the bearing width is too less and it’s difficult to accommodate the grinding tool on the crankpin. The old and leading grinding companies based in Europe and the UK do not have the facility and equipment to grind the crankpin with having width as small as 64 mm.

As a standard protocol, RA Power Solutions technicians prepare pre-inspection reports for all technical parameters they check before repairing the crankshaft. After completing the crankshaft repair of the DAIHATSU 5DC-17 engine, they prepare final reports using RA Power Solutions’ inspection formats. We keep these reports on record and share them upon request.

RA Power Solutions is proud to execute successfully the onsite grinding of the crankpin, having such a small bearing width. Technicians repaired the damaged engine block using metal stitching and the metal locking process. This process saved the block from rejection. The engine, after repair, is performing satisfactorily.

RA Power Solutions is the only company in the asian continent providing onsite crankshaft repair for the smaller crankpin width of even 40 mm. For further details, you may contact us at rajshahani@rapowersolutions.com or info@rapowersolutions.com, or call us at +91 9582647131 or  +91 9810012383.

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