Undersized Bearings & Crankpin Bearings for Marine and Diesel Engines

When it comes to marine and diesel engines, we at R A Power Solutions know that accuracy and dependability are not optional; they are required. That’s why we’re happy to have a large inventory of undersized bearings and crankpin bearings in stock, available to ship right away. We make and store parts that fulfill the highest engineering standards for ships, power plants, and industrial generators.

Undersized Bearings in Stock – Ready for Dispatch

We currently stock high-quality undersized bearings for the following diesel and gas engine models:

YANMAR Diesel Engine Bearings

6N18AL-DN / DV — Diameter: 145 mm
YANMAR S185L — Diameter: 140 mm

MAN Diesel Engine Bearings

CME 5L 16/24 — Standard Diameter: 130 mm
MAN 9ASL 25/30 — Standard Diameter: 195 mm
MAN 6L 23/30 H — Standard Diameter: 185 mm

Daihatsu Diesel Engine Bearings

5DK20 — Standard Diameter: 170 mm
5DC-17 — Standard Diameter: 145 mm
6DL-16 — Standard Diameter: 120 mm
8DKM28 — Standard Diameter: 235 mm

Allen Engine Bearings

PVBCS 12 F — Standard Diameter: 190.45 mm to 190.47 mm

Gas Engine Bearings

DEUTZ MWMTBG32V16 — Diameter: 204.50 mm

MAK Diesel Engine Bearings

8M20 — Standard Diameter: 152 mm

Crankpin Bearings for Different Engine Models—Engineered by R A Power Solutions

Crankpin bearings play a crucial role in ensuring that large diesel engines operate smoothly. These bearings hold up the crankshaft journal so that it can turn under large loads and high temperatures. This is especially important in marine engines, power plants, and heavy-duty industrial generators.

High-Precision Manufacturing by R A Power Solutions

We design and supply custom crankpin bearings compatible with a wide variety of engine models and applications. With over 45 years of engineering excellence, we’ve become a globally trusted name in the reconditioning and supply of engine components. Our crankpin bearings are known for:

OEM-standard manufacturing
Precise fitting and clearances
Long service life, even in extreme conditions

crankpin bearings for different type of engines

Commitment to Quality Service

At R A Power Solutions, quality is more than just a policy—it’s our promise. Our services are designed to provide not only parts but end-to-end support:

Rigorous Quality Control
Every bearing is tested for tolerances, metallurgy, and durability before dispatch.
Technical Engineering Support
Our experienced technicians offer fitting assistance, on-site installation, and application analysis.
Global Reach & Fast Dispatch
With inventory in stock and a network of logistics partners, we deliver promptly worldwide.
Reliable Customer Support
Our team is available around the clock to assist with orders, queries, or technical guidance.

Get in Touch Today

Whether you need undersized bearings, crankpin bearings, or expert guidance on engine part replacements, R A Power Solutions is here to help.

FAQs

1. What are undersized bearings and when should they be used in marine engines?

Customers often want to understand the specific conditions under which undersized bearings are recommended over standard ones.

2. How can I determine the correct undersize for crankpin bearings after regrinding the crankshaft?

This is a practical concern for engineers and ship owners who need precise bearing dimensions after crankshaft repair.

3. Are undersized bearings as reliable and durable as standard bearings in diesel engines?

Reliability is a key concern, especially in heavy-duty marine applications where failure can be costly.

4. Can I reuse crankpin bearings after a crankshaft has been ground undersize?

Some customers look for cost-saving options and need clarity on whether reused or new undersized bearings are necessary.

5. Do you supply custom undersized crankpin bearings for specific engine models like MAK, MAN, or Wartsila?

Many users have brand-specific engines and want assurance of compatibility and availability.

When it comes to marine and diesel engines, we at R A Power Solutions know that accuracy and dependability are not optional; they are required. That’s why we’re happy to have a large inventory of undersized bearings and crankpin bearings in stock, available to ship right away. We make and store parts that fulfill the … Continue reading “Undersized Bearings & Crankpin Bearings for Marine and Diesel Engines”

Onsite Crankshaft Repair And In Situ Crankshaft Grinding Services – Comprehensive Guide

In the world of marine, industrial, and power generation engines, crankshaft damage can bring operations to a standstill. Fortunately, onsite crankshaft repair and in situ crankshaft grinding services have revolutionized the way industries handle such emergencies, eliminating the need for disassembly or transportation.

What Is Onsite Crankshaft Repair?

Onsite crankshaft repair (also known as crankshaft repair onsite or on site crankshaft repair) refers to the process of repairing crankshaft damage directly at the site of operation. Whether on a vessel, power plant, or offshore platform, this service ensures minimal downtime and cost-effective solutions. The combination of onsite crankshaft grinding and repairing results in extended crankshaft life and improved engine performance.

In Situ Crankshaft Grinding: The Modern Solution

In situ crankshaft grinding, also known as insitu crankshaft grinding, is a specialized process where the crankshaft is ground in its original position using a customized onsite crankshaft grinding machine. This technique ensures perfect alignment and eliminates the need for dismantling. Our team provides advanced onsite crankshaft grinding services, ensuring the crankpins and main journals are restored to the original manufacturer’s specifications.

Why Choose In Situ Crankshaft Repair Services?

Fast turnaround
Eliminates transportation costs
Precision results with portable machines
Minimal downtime and disruption
Environmentally friendly approach

Complete Onsite Crankshaft Grinding and Polishing

After grinding, the next critical step is crankshaft polishing. Our crankshaft polishing services use high-grade abrasives to enhance surface finish and increase longevity. The combination of onsite crankshaft grinding and polishing results in extended crankshaft life and improved engine performance.

Crankpin Repair and Insitu Machining Expertise

We specialize in onsite crankpin repair, which involves insitu machining of the crankpin to restore it to its standard size and finish. Our technicians use precision-engineered tools for insitu grinding of crankpins, ensuring accurate geometry and surface integrity.

With years of experience in insitu crankshaft machining, we have developed efficient solutions for all types of crankshaft issues, including scoring, taper wear, and journal ovality.

High-Precision In Situ Crankshaft Machining Services

In situ crankshaft machining or on site crankshaft machining is the ideal solution when engine components are too large or critical to be moved. We deploy skilled engineers with portable tools to provide in situ crankshaft machining with micron-level accuracy.

Our in situ crankshaft repair services are trusted worldwide for large engine applications including marine engines, diesel generators, and industrial compressors.

Why Our Services Stand Out

We utilize a state-of-the-art in situ crankshaft grinding machine that can handle crankshafts up to 700mm in diameter. Our mobile teams are available globally to deliver emergency onsite crankshaft grinding repair and insitu crankshaft grinding repair anytime, anywhere.

With our holistic approach, we cover every aspect:

Onsite crankshaft grinding and repair
Insitu crankshaft machining
Insitu machining & polishing of crankshaft
In situ machining and repair of crankshaft

When engine downtime is not an option, trust our expert in situ crankshaft repair services. With advanced tools, skilled technicians, and decades of experience, we offer the most reliable onsite crankshaft grinding, crankshaft repair on site, and crankpin repair solutions globally. For efficient, cost-effective, and precision onsite crankshaft grinding services, contact our team today and keep your engines running smoothly.

FAQ

1. What is the difference between onsite crankshaft repair and in situ crankshaft grinding?

Onsite crankshaft repair is a broader term that includes all types of crankshaft repair work done at the client’s location. In situ crankshaft grinding is a specific process within that service, involving precision grinding of the crankshaft journals or crankpins in their original position using portable machines.

2. Can crankshaft repair be done without removing the crankshaft from the engine?

Yes, our in situ crankshaft grinding and repair services allow us to perform repairs without dismantling the crankshaft from the engine, saving time and reducing costs.

3. How long does onsite crankshaft grinding usually take?

The duration depends on the extent of damage and the number of crankpins or journals to be repaired. Typically, a single crankpin can be ground within 24–30 hours, including inspection, setup, and final polishing.

4. What types of engines can you repair onsite (marine, power plant, etc.)?

We service marine engines, diesel power plant generators, offshore equipment, and large industrial compressors. Our technicians are experienced in handling all major engine makes and models.

5. What is the maximum diameter crankshaft you can grind onsite?

Our portable in situ crankshaft grinding machine can handle crankshafts up to 700 mm in diameter.

In the world of marine, industrial, and power generation engines, crankshaft damage can bring operations to a standstill. Fortunately, onsite crankshaft repair and in situ crankshaft grinding services have revolutionized the way industries handle such emergencies, eliminating the need for disassembly or transportation. What Is Onsite Crankshaft Repair? Onsite crankshaft repair (also known as crankshaft … Continue reading “Onsite Crankshaft Repair And In Situ Crankshaft Grinding Services – Comprehensive Guide”

In Situ Crankshaft Machining | Insitu Crankpin Grinding | Onsite Machining of Crankshaft

It is generally observed that whenever there is a failure of bearing, it causes serious damage to the crankshaft. The crankpin and main journal develop excessive ovality, deep bearing line marks are observed and in some cases, the impact of failure is so high that it leads to depression/cuts on the crankpin. In this situation, crankshaft needs grinding and polishing.

In Situ Crankpin Machining | Onsite Crankshaft Grinding & Polishing Offered by RA Power Solutions:

In case of failure of the crankshaft, RA Power Solutions undertakes in situ crankshaft grinding and polishing. We have a team of experienced technicians and our response time to an emergency breakdown situation is minimum. All our technicians hold valid Indian CDC and can fly to any destination worldwide in the minimum possible time. Technicians can also sail on the vessel and can undertake the repairs.

The crankshaft is repaired with minimum downtime, as there is no requirement of removal of crankshaft from the engine block. We have in situ crankshaft grinding machine available in the range of 35 mm to 700 mm to cater to the emergency breakdown.

**Inspection of Crankpin on Board a Vessel**

**Onsite Inspection of Crankpin Before Polishing & Grinding**

In Situ Crankshaft Grinding & Polishing | Four-Decade of Experience

It is important that after damage and failure of crankshaft, it is thoroughly inspected by an experienced technician, and all the major parameters are recorded. The planning for the repair is done, and the crankshaft is repaired successfully. We possess the latest and calibrated instrumentation to conduct the pre and final inspection of the crankshaft. The crankshaft grinding equipment used for in situ grinding and polishing is of the latest design with minimum vibration. This facilitates us to maintain generally the tolerance after grinding within 10 to 20 microns and a surface finish of less than 0.2 micrometers in terms of RA value. These tolerances are far better than the tolerances specified by the manufacturer.

**In Situ Crankshaft Grinding & Polishing by Crankshaft Grinding Machine**

In Situ Repair of Crankshaft | Reduce Maintenance Cost

The industries and the shipping companies are well aware of exorbitant rates charged by the few selected companies based in Europe for in situ repair of crankshaft. RA Power Solutions have changed this trend worldwide. Our charges are the most reasonable and lowest in the world with international standards. Our in situ crankshaft repair is cost-effective with minimum downtime and avoids costly replacement.

**Crankshaft Grinding by Experienced Technician**

**Crankshaft Grinding Service on Moving Vessel**

Benefits of In Situ Crankshaft Repair by RA Power Solutions

We have in house team of trained and experienced technicians who can be deputed at your site with in situ crankshaft grinding and polishing machine in minimum time.
We extend 24*7 services worldwide with a guarantee.
More than forty years of experience in crankshaft repair has proven us to be leaders in this field.
Excellent analytical ability because of experience and the use of modern instruments can save your crankshaft from rejection.

We recommend inspection by our technician prior to planning any repair procedure. Most reliable company working for leading industries and shipping companies. References can be provided on request.

For any information on onsite machining, insitu crankpin grinding, on site machining services and onsite machining of crankshaft please email us at rajshahani@rapowersolutions.com or info@rapowersolutions.com, or call us at +91 9582647131 or +91 9810012383.

**Portable Insitu Crankshaft Grinding Machine**

**Crankpin After Grinding by RA Power Solutions**

It is generally observed that whenever there is a failure of bearing, it causes serious damage to the crankshaft. The crankpin and main journal develop excessive ovality, deep bearing line marks are observed and in some cases, the impact of failure is so high that it leads to depression/cuts on the crankpin. In this situation, … Continue reading “In Situ Crankshaft Machining | Insitu Crankpin Grinding | Onsite Machining of Crankshaft”

In Situ Crankshaft Grinding Machine | Onsite Crankshaft Grinding & Polishing Machine | Crankshaft Grinder – RA Power Solutions

The in situ crankshaft grinding and crankshaft repair machine is a unique invention and is of great assistance to the shipping companies as they can not remove the crankshaft from the vessel and send it to the workshop for repair. Again, the crankshaft grinding machines installed in the workshop are not an ideal solution due to its high cost and lack of know-how to operate. RA Power Solutions manufactures and exports onsite crankshaft grinding and repair machines having a range of 35 mm to 700 mm in terms of the diameter of crankpin and main journal of the crankshaft.

Crankshaft Grinding Machine of Bigger Diameter

Crankshaft Grinding Machine has the following features:

Onsite crankshaft grinding and polishing machine is compact, lightweight, and can be inserted from the inspection window of the engine block.
It is simple in design, easy to operate, and maintain
Crankshaft grinding and polishing machine body is manufactured out of titanium steel having the property of absorbing the vibrations. With the vibration or almost zero vibration machine can also be used for crankshaft grinding and crankshaft repair while sailing of the vessel.
- All parameters and tolerances as recommended by the engine manufacturer can be strictly maintained.
With the use of onsite crankshaft grinding and polishing machine, repair can be done in one setting. Thus saving the time.
This crankshaft grinding and polishing machine is manufactured with a pneumatic or electrical drive depending on the client’s requirement.
On Job training for the operation and maintenance of the crankshaft grinding machine is extended through our experienced technicians.
Crankshaft repair machine is supplied in a toolbox and can be transported all over the world.

**Onsite Crankshaft Grinding & Repair Machine**

We have sold more than 70 crankshaft grinding machines all over the world that includes shipping companies, leading repair workshops and power plants, etc.

The author of the blog is Mr. Raj Shahani, Managing Director of the company. He is having 40 years of experience in solving the major issues related to repair and overhauling of engines, grinding and repair of the crankshaft, and many more related to the high capacity engine.

For more information regarding onsite machining of crankshaft, in situ crankshaft grinding repair, crankshaft grinding machines, onsite crankshaft grinding, and crankshaft polishing equipment, please email us at rajshahani@rapowersolutions.com or info@rapowersolutions.com, or call us at +91 9582647131 or +91 9810012383.

**Repair of Crankpin by Crankshaft Grinding Machine**

**Onsite Grinding Machine for Small Diameter**

RA Power Solutions manufactures in situ crankshaft grinding and polishing machine. It is a revolutionary, lightweight, easy-to-operate, and compact crankshaft grinding and crankshaft polishing machine which can undertake the repair of crankpins up to the diameter of 700 mm without removing the crankshaft from the engine block. The in situ crankshaft grinding and crankshaft repair … Continue reading “In Situ Crankshaft Grinding Machine | Onsite Crankshaft Grinding & Polishing Machine | Crankshaft Grinder – RA Power Solutions”