In Situ Grinding Crankpins Archives - Rebabbitting Bearing

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.

In Situ Grinding Crankpins | Insitu Crankshaft Grinding Services

Raj — Fri, 11 Oct 2019 17:13:59 +0000

With over four decades of experience, RA Power Solutions provides in situ crankshaft grinding, crankpin grinding, crankshaft inspection, and repair services for large, high-capacity marine engines and engines used in various industrial applications.

In olden times, whenever the crankpin or main journal of the crankshaft was damaged due to bearing failure or any other reason, the crankshaft was removed from the engine block by disassembly of the complete engine, packed, and taken to the workshop for grinding on a stationary crankshaft grinding machine.

Introduction of On Site Machining Tools:

With the introduction of an onsite machining tool, it is possible to undertake the repair of the crankpin and main journal. RA Power Solutions undertakes onsite grinding of crankshaft and main journal of the diameter ranging from 35 mm to 700 mm. The repair is possible without disassembling the engine, and there is no need for the removal of the crankshaft. The portable and lightweight crankshaft machining tool is inserted from the window for grinding and polishing.

In Situ Crankshaft Grinding

Why This Technology Stands Out

Advantage	What It Means for You
Worldwide, mobile deployment	Technicians carry the machine to any site for fast response
Cost savings on downtime	Repairs avoid engine disassembly, minimizing downtime and expenses
Precision and quality	Maintains dimensional tolerances within 10–25 microns, with OEM-level surface finish
Lower freight costs	Machine weighs only one-third of competitors, reducing shipping costs
Lower freight costs	RA Power provides training on operation and upkeep, empowering your team

The following are the advantages of using RA Power Solutions’ in situ grinding crankpins services:

Experienced technicians to assess the fault in the crankshaft and plan the repairs.
The latest design of portable crankshaft grinding tools ranges from 35 to 700 mm.
The lightweight machine can travel as accompanied baggage by air to any part of the world.
Our crankshaft grinding machine weighs 1/3rd of our competitors saving on freight costs.
RA Power Solutions is the world’s largest manufacturer of portable in situ crankshaft grinding. machines having sold more than 80 crankshaft grinding machines all over the world. Technicians can modify and manufacture the dedicated machine according to the space available at the site.
Minimum repair time and cost of downtime are reduced considerably.
A company having more than forty- five years of experience.
The latest breed of inspection instruments is available to undertake hardness tests, MPI, surface roughness tests, dimensional inspection, etc.
We are a New Delhi-based company and offer rates that are considerably lower than European companies.

After Repair of Engine Block, Grinding of Crankpin is in Process

Real-World Success: Grinding Underway at Sea

RA Power Solutions accomplished a remarkable offshore repair on a MAN B&W 6L 28/32H crankshaft during a vessel’s voyage from Cape Town to India. Their technicians:

Measured each crankpin’s taper, ovality, and hardness.
Used MPI to inspect for cracks (none found).
Re-grinded all crankpins by 0.5 mm (from 230 mm to 229.50 mm).
Delivered tolerance results within 0.03 mm accuracy—all while the ship was sailing.

For more information on in situ crankshaft grinding and in situ crankshaft grinding repair, please email us at rajshahani@rapowersolutions.com, info@rapowersolutions.com, or call us at +91 9582647131 or +91 9810012383.

FAQs:

1. What is onsite crankshaft grinding?

Onsite crankshaft grinding repairs crankpins and main journals without removing the crankshaft.

2. What diameter range can RA Power Solutions handle?

They grind crankshafts and main journals from 35 mm to 700 mm in diameter.

3. Do you need to disassemble the engine for repairs?

No, the repair process works without disassembling the engine.

4. What technology does the grinding machine use?

The machine is centerless and uses the same principle as bench-type crankshaft grinders.

5 How does the machine protect the fillet radius?

It avoids referencing the crankpin’s fillet, preventing damage during grinding.

The post In Situ Grinding Crankpins | Insitu Crankshaft Grinding Services appeared first on Rebabbitting Bearing.

Crankpin Grinding By RA Power Solutions | Over 4 Decades Experience

Raj — Mon, 28 Nov 2016 11:38:27 +0000

The incidence of failure of the crankpin bearing is higher than that of the main journal bearing of the crankshaft. The main reason is that the crankpin has the major load of the engine due to its design characteristics.

Crankshaft Ready for Grinding

RA Power Solutions Pvt. Ltd. undertakes onsite grinding and polishing of crankpins. The crankpin diameter ranging from 60 mm to 700 mm, can be repaired by grinding and polishing. The crankpin diameter is maintained as per the manufacturer’s recommendation, controlling the taper and ovality.

In case of failure of the crankpin bearing, RA Power Solutions can undertake grinding and polishing of the crankpin without removing the crankshaft from the engine block. Thus saving the downtime of the engine.

Worldwide Services Provider

We have been regularly executing the inspection and repairs in Madagascar, Oman, Qatar, Philippines, Bahrain, Srilanka, Bangladesh, Myanmar, Turkey, Nigeria, Greece, Saudi Arabia, UK, Dubai, Malta, Cyprus, Singapore, Malaysia, Colombia, Indonesia, Hong Kong, Spain, Netherlands, Dubai, Portugal, Estonia, Morocco, Belgium, Vietnam, Canada, Jordan, Libya, Kuwait, Egypt, Morocco, Yemen, Bahrain, Tunisia, Sudan, Oman, Algeria, Saudi Arabia, Iraq, Iran, UAE, Sri Lanka etc.

For more information on Crankpin Grinding Services, Crankpin Repair, and Onsite Crankshaft Grinding please email us at rajshahani@rapowersolutions.com, or info@rapowersolutions.com, or call us at +91 9582647131 or +91 9810012383.

FAQs:

1. What is crankpin grinding?

Crankpin grinding is the precision machining process that restores the crankpin surface to the correct diameter and finish after wear or damage.

2. Can you grind the crankpin without removing the crankshaft?

Yes, We perform onsite crankpin grinding without removing the crankshaft from the engine block to minimize downtime.

3. What size crankpin diameters do you handle?

We grind crankpin diameters ranging from 60 mm to 700 mm for various engine types.

4. Which industries benefit from your crankpin grinding services?

Marine vessels, diesel power plants, and heavy industry equipment all benefit from our precision grinding repairs.

5.Why is crankpin grinding important?

Grinding corrects wear, taper, and ovality, restoring smooth operation and extending engine and bearing life.

The post Crankpin Grinding By RA Power Solutions | Over 4 Decades Experience appeared first on Rebabbitting Bearing.