Bearings of Yanmar Engine Archives

Crankpin Bearings are precision components placed between the crankshaft and the big end of the connecting rod. They enable smooth rotation while handling heavy, cyclic loads—critical for minimizing friction, wear, and heat in the engine’s dynamic environment.
Typically made as two-piece semi-circular shells, these bearings are manufactured from multi-layer steel with specialized overlays for durability and performance.

Why Crankpin Bearings Matter — Especially in Marine & Heavy-Duty Engines

On large diesel, marine, and industrial engines, crankpin bearings:

Allow smooth, low-friction operation under extreme pressure.
Distribute loads, absorb shocks, and prevent metal-on-metal contact.
Help extend engine life and reduce costly downtime.

After crankshaft grinding or resizing, they often no longer fit—undersized crankpin bearings are essential in these cases. Unfortunately, such sizes are usually rare in the market, especially for older or less common engine models.

RA Power Solutions: Your Expert Source for Crankpin Bearings

With over four decades of experience, RA Power Solutions offers:

A wide inventory of standard and undersize crankpin bearings for major engine makes, including Yanmar, Daihatsu, MAK, MAN, and others.
Globally sourced tri-metal and plain bearings from Japan, Germany, and the UK
Custom special-size manufacturing—especially valuable when standard undersize bearings aren’t available.
Integration of grinding, supply, and commissioning under one provider—minimizing downtime and simplifying your project.

Types & Materials: What Makes a Crankpin Bearing Superior?

Design: Most are use multi-layer constructions—steel backing with copper-lead alloy substrates and wear-resistant overlays that enhance conformity and embeddability.
Lubrication: Bearings rely on hydrodynamic lubrication—an oil film separates moving surfaces. Poor oil supply or boundary lubrication leads to wear, cavitation, and early failure.
Manufacturing types: Bearings can be standard or trimmed to undersize; some advanced options include polymer or sputtered tri-component coatings for enhanced durability.

MAN B&W engine crankpin & main journal bearing undersize

When Do You Need Undersize Crankpin Bearings?

Post-Grinding Fit
Grinding crankshaft journals removes damage and reduces size, so standard bearings no longer fit.
Obsolete Engine Models
Older or non-mainstream engines may lack available spare parts—undersize bearings become a critical solution.
Downtime Reduction
Having ready-to-ship bearings saves time and keeps operations on track—critical in marine, industrial, or power generation applications.

Keep Your Engines Running: Best Practice

Strategy	Benefit
Assess bearing clearance accurately after grinding	Ensures proper oil film, prevents boundary lubrication
Choose the right material and layer configuration	Improves load resistance, wear life, and engine reliability
Opt for suppliers with custom undersize capability	Saves time, avoids sourcing hurdles for rare sizes
Prioritize reputable brands and tested parts	Reduces downtime and unexpected failures

Connect with Us for Quality Crankpin Bearings

Need reliable crankpin bearings —standard or undersized—for Yanmar, Daihatsu, MAK, MAN, or other engine makes? RA Power Solutions is your global partner, offering precision parts and expert on site support.
✉ Email: info@rapowersolutions.com | info@rapowersolutions.com

Contact us at: +91 9582647131 or +91 9810012383

FAQs:

Q1. What are crankpin bearings?

Crankpin bearings are precision components that support the connecting rod on the crankshaft, reducing friction and wear.

Q2. Why are undersize crankpin bearings needed?

These are required after crankshaft grinding when journal diameters are reduced.

Q3. What causes crankpin bearing failure?

Improper lubrication, high loads, or misalignment are the most common causes of crankpin bearing failure.

Q4. Can custom-size of Bearings be manufactured?

We manufacture custom undersize and special bearings for obsolete or rare engine models.

Q5. Which engines commonly use ?

Marine, industrial, and power engines such as Yanmar, Daihatsu, MAK, and MAN.

Crankpin & main journal Bearings of standard, undersize and special size are available in stock with RA Power Solutions. The most popular makes of engines like Daihatsu, Yanmar, MAN, Allen, CKD Skoda, Cummins, and Ariel Compressor crankpin and main journal bearings are available with us.

RA Power Solutions as a leading crankpin & main journal grinding company understands the importance of ready availability of undersize & special size bearings. We have experienced that in most cases undersized bearings are not available delaying the commissioning of the auxiliary or main engine on board the vessel even after the crankshaft is repaired.

In order to reduce the downtime and to keep the vessel moving we maintain the stock of undersize crankpin and main journal bearings of all popular make & models of auxiliary engine and main engine installed on the vessel.

We have illustrated below the example of a few makes & models of engines bearings that are available in stock.

Sr.No	Description	Qty
1.	MAN CME 5L 16/24 Standard Crankpin Diameter- 130mm a) 0.5 mm Undersized Crankpin Bearing b) 1.0 mm Undersized Crankpin Bearing c) 1.5 mm Undersized Crankpin Bearing	4 pairs 4 pairs 4 pairs
2.	Daihatsu 5DK20 Standard Crankpin Diameter-170mm a) 0.5 mm Undersized Crankpin Bearing b) 1.0 mm Undersized Crankpin Bearing c) 1.5 mm Undersized Crankpin Bearing d) 2.0 mm Undersized Crankpin Bearing e) 2.5 mm undersize Crankpin Bearing	14 Pairs 6 pairs 4 pairs 4 pairs 4 pairs
3.	Daihatsu 5DC17 Standard Crankpin Diameter-145mm a) 0.5 mm Undersized Crankpin Bearing b) 1.0 mm Undersized Crankpin Bearing c) 1.5 mm Undersized Crankpin Bearing d) 2.0 mm Undersized Crankpin Bearing e) 2.5 mm Undersized Crankpin Bearing f) 3.0 mm Undersized Crankpin Bearing	14 pairs 4 pairs 4 pairs 4 pairs 4 pairs 4 pairs
4.	Yanmar Engine 6N18AL-DN/DV Standard Crankpin Diameter-145 mm a) 0.40 mm Undersized Crankpin Bearing b) 0.80 mm Undersized Crankpin Bearing c) 1.60 mm Undersized Crankpin Bearing d) 2.0 mm undersized Crankpin Bearing	16 pairs 14 pairs 4 pairs 4 pairs
5.	Yanmar Engine –S 185 L Standard Crankpin Diameter-140 mm a) 0.8 mm Undersized Crankpin Bearing b) 1.2 mm Undersized Crankpin Bearing c) 1.60 mm Undersized Crankpin Bearing d) 2.0 mm Undersized Crankpin Bearing	6 pairs 4 pairs 4 pairs 4 pairs
6.	MAN 9ASL 25/30 Standard Crankpin diameter-195mm a) 2.5 mm Undersized Crankpin Bearing b) 3.0 mm Undersized Crankpin Bearing c) 4.0 mm Undersized Crankpin Bearing	2 pairs 4 pairs 4 pairs
7.	Allen Engine PVBCS12 F Standard Crankpin diameter – 190.40 mm a) 0.5 mm Undersized Crankpin Bearing b) 1.0 mm Undersized Crankpin Bearing	4 pairs 4 pairs
8	Gas Engine Deutz MWM TBG32V16 Standard Crankpin diameter 204.50 mm a) 0.5 mm Undersized Crankpin Bearing	4 pairs
9.	CKD Skoda 638A6S 2270 KVA Standard Crankpin diameter 280 mm a) 0.5 mm Undersized Crankpin Bearing b) 1.0 mm Undersized Crankpin Bearing c) 1.5 mm Undersized Crankpin Bearing d) 2.0 mm undersized Crankpin Bearing	12 pairs 12 pairs 12 pairs 12 pairs
10	Cummins Model QSV 91G	4 pairs
11	Ariel Compressor JGH/4 stroke 4.5 inch a) 0.5 mm Undersized Crankpin Bearing b) 1.0 mm Undersized Crankpin Bearing c) 1.5 mm Undersized Crankpin Bearing	4 pairs 4 pairs 4 pairs
12	Ariel Compressor JGH/4 stroke 4.5-inch Main Journal a) standard size Main Journal Bearing	3 pairs

We export Trimetal engine bearing and Babbitt white metal bearings in countries like Argentina, Bahamas, Barbados, Bermuda, Bolivia, Brazil, Canada, Chile, Colombia, Costa Rica, Cuba, Dominican Republic, Ecuador, El Salvador, Guatemala, Guyana, Haiti, Honduras, Jamaica, Iran, Mexico, Nicaragua, etc.

For more information on white metal bearing alloy in ingot form, bearings for yanmar engine, bearing manufacturing company, bearings for Daihatsu engine, and bearing for engines contact us at rajshahani@rapowersolutions.com or info@rapowersolutions.com or call us at +91 9582647131 or +91 9810012383.

Category: Bearings of Yanmar Engine

Crankpin Bearings: A Best Component in Engine Reliability