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.
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 andundersized 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.
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 47+ 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 nearly five 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 bearingengine 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 Solutionsplays 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.
CKD Skoda Bearing
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 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
We also have engine crankpin bearings available in our stock for various engine models from Wärtsilä, MAN B&W, Sulzer, Yanmar, Daihatsu, MAK, Caterpillar, Cummins, Deutz, Mitsubishi, Allen, Himsen, and Niigata.
Dubai remains our top priority market for crankpin bearing exports, given the high volume of vessel traffic through Jebel Ali and the Strait of Hormuz, where delays in bearing supply can directly affect sailing schedules.
Beyond the UAE, we regularly supply crankpin and tri-metal bearings worldwide, including Iraq, Iran, Italy, Oman, Saudi Arabia, Singapore, Russia, Qatar, Abu Dhabi, Sharjah, Ajman, Umm Al-Quwain, Fujairah, Bahrain, Gambia, Kuwait, and across the Caribbean, Southeast Asia, and Africa.
Our reach also extends to Canada, Australia, the UK, the US, Europe, and other major shipping and flag-registry hubs across Asia, the Pacific, and Latin America.
Wherever the vessel is registered or operating, we ensure OEM-spec bearings, complete certification, and export documentation are ready so customs clearance never holds up the sailing schedule.
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.
Frequently Asked Questions (FAQs)
1. What is a Tri-metal Bearing? Tri-metal Bearing is the engine bearing with three layers of different metals. Such bearings are able to withstand the loads, provide low friction and reliable work in diesel engines, marine engines, compressors, and other rotating mechanisms.
2. What is the difference between Tri-metal and Bi-metal Bearings? There are three layers of different materials in the Tri-metal Bearings and there are two layers in the Bi-metal Bearings. Depending on the design of the engine, its loading and operating conditions.
3. Can RA Power Solutions manufacture bearings for old or discontinued engines? Yes. RA Power Solutions can manufacture Tri-metal and Bi-metal Bearings for old and obsolete engines. The Bearings can be manufactured in accordance with the drawing or the sample which is provided by the customer.
4. Can you supply undersize bearings for damaged crankshafts? Yes. RA Power Solutions can manufacture special undersize Tri-metal and Bi-metal Bearings when the crankshaft has been reground above the maximum recommendation by the manufacturer. This allows saving the crankshafts which otherwise had to be renewed.
5. Which engine brands can RA Power Solutions supply bearings for? RA Power Solutions provides tri-metal and bi-metal bearings for a lot of engines such as Wartsila, MAN B&W, MAK, Yanmar, Daihatsu, Himsen, Caterpillar, Bergen, and Deutz. The Bearings can be manufactured in accordance with the required size, drawing, or sample.
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 47+ 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.