Why Crankpin Bearings Are Important for Marine Diesel Engines?

When it comes to marine diesel engines, every component is critical to ensure smooth operation—including crankpin bearings. These frequently overlooked components are required for connecting rods to revolve smoothly around the crankpin, carry huge loads, and withstand intense combustion forces.

Tri Metal Bearing for Crank Pin and Main Journal

What Are Crankpin Bearings?

A crankpin bearing, which is also referred to as a rod bearing journal, is a precision component that is located between the crankshaft and connecting rod. Its purpose is to facilitate seamless rotation, minimize friction, and reduce wear. Plain or tri-metal varieties are frequently employed in marine applications due to their high-load capacity and durability.

Why Undersized Crankpin Bearings Matter on Ship Engines?

During engine overhauls or crankshaft grinding, standard-size bearings often no longer fit correctly. This raises a serious issue. Suppliers rarely keep undersized bearings in stock, especially for older engine models that manufacturers have discontinued.

Crankpin Bearings of Yanmar Diesel Engine

RA Power Solutions: Reliable, Precision Solutions

With over 45 years of global service, RA Power Solutions specializes in:

Sourcing tri-metal bearings from reputable manufacturers in the UK, Germany, and Japan
Providing custom undersized crankpin and main journal bearings—even for long-discontinued engine models
Onsite crankshaft repair services anywhere in the world.

Crankpin Bearings for Different Marine Engines

At RA Power Solutions, we stock and supply standard and undersized crankpin bearings for a wide range of popular marine engines. We design our solutions to fit after crankshaft grinding. They ensure minimal downtime and reliable performance

Engine Make	Engine Model	Bearing Type	Undersize Availability	Applications
Yanmar	S185L	Tri-Metal / Plain	0.80 to 2.00 mm	Marine propulsion & power plants
Daihatsu	5DC-17	Tri-Metal	0.50 to 4.00 mm	Auxiliary engines on ships
MAN	L28/32	Tri-Metal	0.50 to 2.00 mm	Marine main engines
MAK	M32C	Tri-Metal	0.50 to 2.50 mm	Heavy-duty marine & industrial

The Role of Crankpin Bearings in Engine Longevity

Friction Reduction / Hydrodynamic Function: These bearings utilize an oil film to separate metal surfaces, significantly lowering wear and safeguarding the crankshaft.
Load & Shock Absorption: Especially critical in high-load marine engines, these bearings help dampen combustion forces while maintaining alignment.
Cost-Effective Maintenance: Designed to be replaceable, they protect expensive components like the crankshaft itself from damage. The alternative—machining new bearing surfaces—would make engine rebuilds far more costly.

crankpin bearing for daihatsu engine — Crankpin Bearing for Daihatsu Engine

For more details of the Crankpin Bearings for Marine Diesel Engines, undersized crankpin bearings, Tri-Metal Bearings, please email us at rajshahani@rapowersolutions.com, or info@rapowersolutions.com, or call us at +91 9582647131 or +91 9810012383.

FAQs:

1. What are crankpin bearings in marine diesel engines?

Crankpin bearings support the connecting rod on the crankshaft, reducing friction and wear.

2. Why are undersized crankpin bearings needed?

You need undersized crankpin bearings after crankshaft grinding. Standard bearings no longer fit.

3. Which marine engines use crankpin bearings?

MAK, MAN, Yanmar, and Daihatsu diesel engines commonly use them.

4. How do crankpin bearings extend engine life?

They minimize friction, absorb loads, and protect the crankshaft from damage.

5. Where can I buy crankpin bearings for marine diesel engines?

RA Power Solutions supplies standard, undersized, and custom crankpin bearings worldwide.

Tri Metal Bearing | Engine Bearing Manufacturer | Engine Tri Metal Bearing

We are the manufacturer and trader of Tri-metal bearings and Bi-metal Bearings used in Diesel engines, compressors & all types of rotating equipment.

As a marine engine and mechanical equipment repair company serving industries & shipping companies all over the world for the last 45 years, we understand the importance of the availability of not only high-quality Tri-metal and Bi-metal Bearings but also the importance of delivering bearings on time. During our experience of the last four decades, we have observed that although the crankshaft of the marine engine, compressor, or any rotating equipment is repaired due to the non-availability of the crankpin & main journal bearing engine cannot be put back into operation, thus causing losses to the owner.

The non-availability of engine & compressor bearings may be because the equipment is outdated and no longer manufactured by the original equipment manufacturer. There are several marine engines, diesel generating sets, and compressors in operation on vessels or industries, the manufacturing of which has been discontinued due to either the closure of the manufacturing unit or the equipment becoming obsolete.

RA Power Solutions plays an important role in the manufacturing of marine engines, white metal bearing repair, diesel generators, compressors, and rotating equipment bearings, Tri-metal and Bi-metal.

Tri-Metal Bearing and Bi-Metal Bearing Manufacturer

We have the Principles based in the UK, Europe, and Japan, from where we source the Tri-Metal Bearing, the Bi-metal Bearings, and Babbitt white metal bearings up to 1500 mm diameter are manufactured in-house.

In case your Engine model is old and is no longer manufactured by the manufacturer, RA Power Solutions can help you in the development & manufacturing of Tri-metal and bi-metal bearings strictly as per the drawing provided by you. We also develop and manufacture Tri-metal & Bi-metal bearings as per the sample provided by the client.

Tri metal Bearing for crank pin/main journal ready for dispatch — **Tri-metal Bearing for crankpin/main journal ready for dispatch**

Manufacturing of standard and non-standard tri-metal bearings and bi-metal bearings for marine engines and compressors

As a crankshaft repair company, we have observed that due to serious accidents, the damage to the crankpin/ main journal is much more than the last limit of undersize recommended by the manufacturer. In this case, the engine manufacturer refuses to supply the undersized and oversized bearings.

For example, in the case of a Daihatsu crankpin with a standard diameter of 170 mm, the final size after grinding may be 167 mm. We manufacture a 3.0 mm undersize bearing for this condition. The engine is then put back into operation. On the other hand, as per the engine manufacturer, the crankshaft would be considered unusable and rejected.

We have saved hundreds of crankshafts by supplying undersize Tri-metal Bearings and Bi-metal Bearings beyond the last limit of grinding recommended by the engine manufacturer. We regularly supply engine bearings for crankpins, Tri-metal Bearings, engine tri-metal bearings, and Bi-metal bearings for all makes & models of engines like Wartsila, MAK, MAN B&W, Yanmar, Daihatsu, Himsen, Caterpillar, Bergen, Deutz, etc.

**Daihatsu crankpin & main journal bearing**

We have been regularly exporting the bearings to Bahrain, Bangladesh, Bhutan, Brunei, Burma, Cambodia, East Timor, Georgia, Hong Kong, India, Indonesia, Iran, Iraq, Israel, Japan, Jordan, Kazakhstan, Kuwait, Kyrgyzstan, Laos, Lebanon, Malaysia, Mongolia, Nepal, North Korea, Oman, Papua New Guinea, Philippines, Qatar, etc.

**Yanmar Engine crankpin & main journal bearing**

**MAN B&W engine crankpin & main journal bearing undersize**

This blog is written by Mr. Raj Shahani (Managing Director of RA Power Solutions India Pvt. Ltd.). Mr. Shahani is a highly experienced business leader with rich experience of more than 45 years in the field of Power, Heavy, and Shipping industries. He is a Technical Adviser to many shipping and heavy industries across the globe.

For more information on tri-metal bearing manufacturing companies, white metal bearing manufacturers, Engine Bearing manufacturers, bearings for Yanmar engines, bearings for Daihatsu engines, engine tri-metal bearings, and tri-metal bearings, contact us at rajshahani@rapowersolutions.com or info@rapowersolutions.com or call us at +91 9582647131 or +91 9810012383.

Crank Pin Repair on Board a Vessel of Hyundai Diesel Engine – RA Power Solutions

RA Power Solutions Pvt. Ltd. was called by a shipping company based in Indonesia, reporting the failure of the crank pins of a Hyundai 1.8 MW diesel engine. Our technicians were deputed with a portable crankshaft grinding machine designed and manufactured by us.

On the arrival of our technicians, it was observed that all the 6 CR pins of the Hyundai engine were badly damaged due to the failure of the lubricating oil pump. The initial inspection of crank pins was conducted, comprising calibration for taper and ovality. Hardness test, crack detection by MPI, and deflection checks were also done and recorded.


**MPI of Crankpin for Crack Detection is in Process**	style=”color: #000000;”>><em>Crank Pin Repair of Hyundai Diesel Engine

RA Power Solutions Pvt. Ltd. was successful in executing the on site crankshaft grinding of 6 nos. CR pins in a short time of 72 hours. This achievement was possible because of the excellent design of the onsite crankshaft grinding machine developed and manufactured by RA Power Solutions ‘ in-house engineers. A pneumatic turbine with high capacity and the latest design was used, which helped technicians to execute the repairs in a short duration.

CR pins Grinding of Hyundai engine is in Process	CR Pin After Grinding

RA Power Solutions Pvt. Ltd. is far ahead of its competitors, having more than 45 years of experience and extending the services of diesel engine crankshaft repairs all over the world. To get more information regarding Hyundai diesel engine, Crank Pin Repair, engine bearings for crankpin, in situ grinding crankpins, contact us at rajshahani@rapowersolutions.com or info@rapowersolutions.com, or call us at +91 9582647131 or +91 9810012383.