Engine Bearing | Crankpin Bearing | Main Journal Bearings

Raj Shahani — Mon, 16 Feb 2026 10:24:39 +0000

RA Power Solutions maintains main and auxiliary engine bearings for leading engine manufacturers and their various models.

With over 46 years of global experience in crankshaft repair, we understand the challenges shipowners and power plant operators face during engine overhauls. In many cases, undersized bearings for crankpins and main journals are not readily available in the market. As a result, engine commissioning is often delayed after the repair process.

Crankpin Bearings for Engine Modals

Main Journal Bearings Standard & Undersize

Manufacturers of Crankpin Bearings

Moreover, sourcing customized or non-standard bearing sizes can take considerable time. Project schedules are prolonged, operating expenses rise, and vessel downtime becomes inevitable as a result. Therefore, choosing a repair partner that can provide immediate technical solutions and alternative bearing support is critical for minimizing delays and ensuring smooth engine performance.

Maintenance of Stock of Crankpin | Main Journal Bearings by RA Power Solutions

We maintain a large stock of crankpin and main journal bearings for auxiliary and main engines of popular makes and models.

A few are described as follows:

*Sr No.*	*Description*
*Daihatsu 6DL-16 Standard Crankpin Diameter-120 mm*
1	a) 2.50 mm Undersized Crankpin Bearing
	b) 3.00 mm Undersized Crankpin Bearing
	c) 4.00 mm Undersize Crankpin Bearing

*MAN CME 5L 16/24 Standard Crankpin Diameter- 130mm*
2	a) 0.50 mm Undersized Crankpin Bearing
	b) 1.00 mm Undersized Crankpin Bearing
	c) 1.50 mm Undersized Crankpin Bearing
	d) 2.00 mm Undersized Crankpin Bearing
	e) 2.50 mm Undersized Crankpin Bearing

*Yanmar Engine S 185L Standard Crankpin Diameter—140 mm*
3	a) 0.80 mm Undersized Crankpin Bearing
	b) 1.20 mm Undersized Crankpin Bearing
	c) 1.60 mm Undersized Crankpin Bearing
	d) 2.00 mm Undersized Crankpin Bearing

*Yanmar Engine 6N18AL-DN/DV Standard Crankpin Diameter—145 mm*
4	a) 0.40 mm Undersized Crankpin Bearing
	b) 0.80 mm Undersized Crankpin Bearing
	c) 1.20 mm Undersized Crankpin Bearing
	d) 1.60 mm Undersized Crankpin Bearing
	e) 2.00 mm Undersized Crankpin Bearing
	f) 2.40 mm Undersized Crankpin Bearing
	g) 2.80 mm Undersized Crankpin Bearing

*Daihatsu 5DC-17 Standard Crankpin Diameter—145 mm*
5	a) 0.50 mm Undersized Crankpin Bearing
	b) 1.00 mm Undersized Crankpin Bearing
	c) 1.50 mm Undersized Crankpin Bearing
	d) 2.00 mm Undersized Crankpin Bearing
	e) 2.50 mm Undersize Crankpin Bearing
	f) 3.00 mm Undersize Crankpin Bearing
	g) 4.00 mm Undersize Crankpin Bearing

*MAK 8M20 Standard Crankpin Diameter—152 mm*
6	a) Standard Undersized Crankpin Bearing
	b) 1.00 mm Undersized Crankpin Bearing
	c) 1.50 mm Undersized Crankpin Bearing
	d) 2.00 mm Undersized Crankpin Bearing

*Daihatsu 5DK-20 Standard Crankpin Diameter—170 mm*
7	a) 0.50 mm Undersized Crankpin Bearing
	b) 1.00 mm Undersized Crankpin Bearing
	c) 1.50 mm Undersized Crankpin Bearing
	d) 2.00 mm Undersized Crankpin Bearing
	e) 2.50 mm Undersize Crankpin Bearing
	f) 3.00 mm Undersize Crankpin Bearing
	g) 3.50 mm Undersize Crankpin Bearing
	h) 4.00 mm Undersize Crankpin Bearing
	i) 5.00 mm Undersized Crankpin Bearing

*MAN 6L 23/30H Standard Crankpin Diameter—185 mm*
8	Key Position 12.5 x 15.5
	a) 0.50 mm Undersized Crankpin Bearing
	b) 1.00 mm Undersized Crankpin Bearing
	c) 1.50 mm Undersized Crankpin Bearing
	d) 2.00 mm Undersized Crankpin Bearing
	e) 2.50 mm Undersized Crankpin Bearing
	f) 3.00 mm Undersized Crankpin Bearing
	g) 4.00 mm Undersized Crankpin Bearing
	h) 5.00 mm Undersized Crankpin Bearing

	Key Position 7.7 x 10.7
	a) 0.50 mm Undersized Crankpin Bearing
	b) 1.00 mm Undersized Crankpin Bearing
	c) 1.50 mm Undersized Crankpin Bearing
	d) 2.00 mm Undersized Crankpin Bearing
	e) 2.50 mm Undersized Crankpin Bearing
	f) 3.00 mm Undersized Crankpin Bearing
	g) 4.00 mm Undersized Crankpin Bearing
	h) 5.00 mm Undersized Crankpin Bearing

*Allen Engine PVBCS 12 F Standard Crankpin diameter – 190.45 mm to 190.47 mm*
9	a) 0.50 mm Undersized Crankpin Bearing
	b) 1.00 mm Undersized Crankpin Bearing

*MAN 9ASL 25/30* *Standard Crankpin Diameter-195 mm*
10	a) 2.50 mm Undersize Crankpin Bearing
	b) 3.00 mm Undersize Crankpin Bearing
	c) 4.00 mm Undersize Crankpin Bearing

*Gas Engine Deutz MWM TBG32V16 Standard Crankpin diameter 204.50 mm*
11	a) 0.50 mm Undersized Crankpin Bearing

*MAN 9L28/32 H Standard Crankpin Diameter-230 mm*
12	a) 0.50 mm Undersized Crankpin Bearing
	b) 1.00 mm Undersized Crankpin Bearing
	c) 1.50 mm Undersized Crankpin Bearing
	d) 2.00 mm Undersized Crankpin Bearing
	e) 2.50 mm Undersize Crankpin Bearing
	f) 3.00 mm Undersize Crankpin Bearing

*Daihatsu 8DKM-28 Standard Crankpin Diameter-235 mm*
13	a) 0.50 mm Undersized Crankpin Bearing
	b) 1.00 mm Undersized Crankpin Bearing
	c) 1.50 mm Undersized Crankpin Bearing
	d) 2.00 mm Undersized Crankpin Bearing
	e) 2.50 mm Undersize Crankpin Bearing

*Daihatsu 8DK-32 Standard Crankpin Diameter-250 mm*
14	a) 0.50 mm Undersized Crankpin Bearing
	b) 1.00 mm Undersized Crankpin Bearing
	c) 1.50 mm Undersized Crankpin Bearing

Development of Special-Size Crankpin and Main Journal Bearings

R A Power Solutions also maintains a stock of crankpin and main journal bearings that are undersized beyond the manufacturer’s recommendations. The ready availability of special-size bearings has saved many crankshafts from rejection.

Main Journal Bearings

Engine Bearing Manufacturers

Crankpin Bearing Suppliers

Special-size crankpin and main journal bearings are critical to making sure an engine runs well after a crankshaft repair. When typical undersized bearings aren’t available, custom-engineered solutions are necessary to avoid expensive downtime and delays in commissioning. So, precision manufacture, precise dimensional control, and high-quality Babbitt lining are all done very carefully to meet the exact specifications for the crankpin and main journal.

Also, innovative manufacturing methods and thorough quality checks make sure that the load is evenly distributed, friction is low, and the life of the bearings is longer. Because of this, special-size journal bearings are a reliable choice for marine engines, power plants, and heavy industrial uses.

For undersized crankpin and main journal bearing requirements, please email us at info@rapowersolutions.com or call +91 9582647131 or +91 9810012383.

FAQs

1. What are crankpin and main journal bearings used for in an engine?

Crankpin bearings support the crankpins, while main journal bearings support the crankshaft main journals; both reduce friction between moving parts and ensure smooth engine rotation, especially after grinding or repair work.

2. Why are undersized bearings sometimes required after crankshaft repair?

When crankpins or main journals are ground to remove wear or damage, their diameters are reduced. As a result, undersized bearings are needed to maintain correct clearances and proper lubrication.

3. Does RA Power Solutions stock both standard- and special-sized bearings?

Yes—the company maintains a large inventory of standard, undersized, and special-size crankpin and main journal bearings for many popular engine makes and models, helping minimize downtime.

4. Which engine brands are supported with ready-to-use or custom bearings?

RA Power Solutions supports top manufacturers such as Wartsila, Daihatsu, MAN, Sulzer, Yanmar, MWM, Caterpillar, MTU, Cummins, and more, with a wide range of bearing sizes in stock.

5. Can special-size bearings extend the life of a repaired crankshaft?

Absolutely — custom bearings made beyond OEM undersize limits can save crankshafts that would otherwise be rejected, ensuring reliable performance and reducing the need for costly replacements.

The post Engine Bearing | Crankpin Bearing | Main Journal Bearings appeared first on Rebabbitting Bearing.

Engine Bearing Manufacturers | RA Power Solutions

Raj — Thu, 23 Mar 2023 11:15:26 +0000

RA Power Solutions has realized that it is quite difficult to get the crankpin and main journal bearings for the diesel engine, compressors, pumps and motors, and all rotatory equipment.

The equipment manufacturer discontinued most models, so you can no longer source replacement bearings from them. As a result, you must turn to custom-engineered or aftermarket alternatives.

In this situation, it’s very difficult to operate the equipment as bearings need replacement after fixed hours of operation.

RA Power Solutions plays an important role in the development and manufacture of Tri metal and Bi-metal babbitt bearings. These bearings are manufactured on the basis of the following information:

Development of bearings as per the sample:

We convert the client’s provided bearing sample into a detailed CAD‑CAM drawing. The new bearings are manufactured according to the dimensions and type of material composition like tri-metal or babbitt white metal.

Development of bearing as per the drawing:

The drawing of the bearings for diesel engines, compressors, pumps and motors, and all rotatory equipment is provided by the client. We develop and manufacture the bearings strictly as per the drawing and the type of bearing required by the customers.

Acceptance of small quantity of bearings:

We accept a small number of bearings for all applications. We also maintain a large stock of main & auxiliary engine bearings of popular make and model of engines like MAK, CKD Skoda, MAN B & W, Cummins, Ariel Compressor Bearings, Caterpillar, Niigata, Daihatsu, Mirrlees Blackstone, Deutz, Pielstick, etc.

We are the best engine bearing manufacturers and we export Babbitt white metal bearings/ Tri 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 engine bearing manufacturers, please email us at rajshahani@rapowersolutions.com, or info@rapowersolutions.com, or call us at +91 9582647131 or +91 9810012383.

FAQs

1. Why is sourcing replacement bearings for diesel engines and pumps so challenging?

RA Power Solutions explains that many engine and pump models are discontinued, making OEM bearings hard to find—necessitating custom-engineered Tri‑metal and Bi‑metal Babbitt replacements.

2. How do you ensure precise fit and compatibility for custom bearings?

They digitally recreate the bearing via CAD-CAM from your sample or drawing, then craft the bearing to exact dimensions and materials (Tri‑metal or Babbitt white metal).

3. Do you accept small orders or only large-scale runs?

RA Power Solutions welcomes small-quantity orders and also stocks popular engine brands (e.g., MAN B&W, Cummins, Caterpillar, Ariel, etc.) for quicker turnarounds

4. Can you supply these custom bearings internationally?

Yes—they export white-metal and tri-metal bearings globally to countries such as Argentina, Brazil, Canada, Mexico, and many more

5. How can I contact RA Power Solutions for bearing manufacturing or repair?

Reach out via email at rajshahani@rapowersolutions.com or info@rapowersolutions.com, or call +91 95826 47131 or +91 98100 12383.

The post Engine Bearing Manufacturers | RA Power Solutions appeared first on Rebabbitting Bearing.

Engine Bearing Manufacturers Archives - Rebabbitting Bearing