crankshaft polshing Archives - Rebabbitting Bearing

Engine Bearings For Crankpin and Main Journal

Raj Shahani — Mon, 13 Apr 2026 09:14:46 +0000

Engine bearings manufactured from tri-metal for the crankpin and main journal of the crankshaft are supplied by RA Power Solutions.

We provide crankshaft grinding services, repair, and overall maintenance of auxiliary and main engines installed on vessels. We also extend these services to high-capacity power plants spread all over the world.

While standard-size bearings are readily available in stock with engine manufacturers, we have experienced that most of the time it is difficult to obtain tri-metal bearings for the crankpin and main journal of the crankshaft in undersized.

Undersized crankpin bearings

Crankpin Bearings For MAN & MAK Engines

White metal babbitt bearings

Undersized Bearings of Yanmar Diesel Engine

Requirement of Undersized Tri-Metal Bearings for Crankshaft

After grinding of the crankpin and main journal of the crankshaft, there is a requirement for undersized bearings, which are, in most cases, not readily available.

RA Power Solutions is the largest exporter of tri-metal bearings, mainly for diesel engines. We are listing below the names of a few popular engines and their models for which we maintain a ready stock of the bearings.

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

MAN CME 5L 16/24 Standard Crankpin Diameter: 130 mm
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-145mm
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-170mm
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 Undersize 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

White Metal Babbitt Bearings

We also manufacture Babbitt white metal bearings and undertake the repair of old, damaged bearings for different applications such as alternators, intermediate shafts, turbines, pumps, etc.

Main Journal Bearings Standard & Undersize

Diesel engine bearings supplier

Engine Bearing Manufacturers

Crankpin Bearing Suppliers

R A Power Solutions: Complete Services for Crankshafts and Engines

R A Power Solutions not only sells bearings but also offers a full range of services at your location or in their workshop, such as

Grinding the crankshaft in place
Crankshaft repair and reconditioning
Grinding and polishing of crankpins on site
Repairing engine blocks and stitching metal
Emergency breakdown services worldwide
Repair services for marine and diesel engines

Our advanced portable equipment and experienced technicians enable us to deliver onsite services without dismantling, helping industries reduce downtime and operational costs.

We work with clients all over the world, including big areas like Saudi Arabia, the United Arab Emirates, Qatar, Kuwait, Oman, and Bahrain. We make sure that our service is quick and dependable.

After crankshaft grinding, the undersized crankpin and main journal bearings are very important. With ready stock availability and integrated repair services, R A Power Solutions ensures quick turnaround and dependable performance for all types of engines.

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

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

Precision Crankshaft Grinding in Tanzania | RA Power Solutions

Raj — Mon, 31 Jul 2023 11:16:20 +0000

Introduction:

Welcome to the world of precision engineering and exceptional crankshaft grinding services in Tanzania. When it comes to ensuring the optimal performance & longevity of your engines, nothing compares to the expertise delivered by our skilled technicians.

With cutting-edge technology & a commitment to greatness, our crankshaft grinding services guarantee that your crankshafts will be converted to their original specifications, eliminating any spots that may hinder your engine’s efficiency.

Damaged Crankpin

Whether you are in requirement of standard repairs or complex custom solutions, our dedicated team is ready to deliver outstanding results, ensuring your engines run smoothly and reliably. Experience the epitome of quality & reliability with our professional crankshaft grinding services in Tanzania.

The Expertise of RA Power Solutions in Crankshaft Grinding Services

RA Power Solutions is a well-known name in the industry, offering top-notch expertise in crankshaft grinding services. With a strong presence in Tanzania, they have carved a niche for themselves with their amazing services in crankshaft repair, grinding, polishing, and inspection.

When it comes to crankshaft grinding, RA Power Solutions stands as a trusted partner for a wide range of clients. Their experienced technicians possess extensive knowledge and experience in handling various types of crankshafts, be it from marine engines, industrial equipment, or power plants.

Crankpin After Grinding And Polishing

The company’s expertise in crankshaft repair is second to none. They employ advanced techniques and cutting-edge equipment to repair damaged crankshafts to their original specifications, providing the highest level of precision and performance.

For those seeking crankshaft polishing services, RA Power Solutions offers a seamless process that results in smooth, mirror-like surfaces on crankshafts. The particular approach adopted during polishing ensures improved performance and reduced friction, resulting in improved efficiency and longevity of the crankshafts.

Crankshaft inspection is a critical aspect of their services, reflecting their dedication to delivering top-tier quality. Through advanced inspection methods, including non-destructive testing & dimensional analysis, RA Power Solutions ensures that every crankshaft meets the strictest industry standards before being returned to its rightful place.

RA Power Solutions stands as a leading authority in crankshaft grinding and repair, polishing, and inspection. Their expertise, coupled with a customer-centric approach, has earned them the trust & loyalty of clients across various industries, making them the go-to choice for all crankshaft-related needs.

The Benefits of Choosing RA Power Solutions for Crankshaft Grinding in Tanzania

When it comes to crankshaft grinding and repair services, RA Power Solutions stands out as a trustworthy and efficient choice. With their expertise and specialized equipment, they deliver a range of essential services that ensure optimal performance & durability of crankshafts.

Crankshaft grinding is a crucial process for restoring the precision and smoothness of damaged crankshafts. RA Power Solutions boasts advanced grinding machinery & skilled technicians who can handle crankshafts of various sizes and designs. Their precise grinding techniques not only eliminate any surface irregularities but also help in restoring the original dimensions, leading to improved engine efficiency & reduced vibrations.

Another key service offered by RA Power Solutions is crankshaft repair. Whether it’s a minor crack or a major damage, their experienced team can effectively repair the crankshaft, saving clients from the cost of a full replacement. By employing state-of-the-art technologies & following industry best practices, they ensure that the repaired crankshafts recover their structural integrity, minimizing the risk of future failures.

RA Power Solutions also places significant emphasis on crankshaft inspection. A thorough inspection is crucial to determine any hidden defects or potential issues that could lead to catastrophic engine failure.

Choosing RA Power Solutions for crankshaft grinding, repair, polishing, and inspection in Tanzania brings multiple advantages. With their cutting-edge equipment & expertise, they ensure the highest quality standards are met, ultimately improving engine performance, increasing the longevity of crankshafts, and delivering customers with the peace of mind they deserve.

Crankshaft Grinding as a Preventive Maintenance Measure for Long-lasting Engines

Crankshaft grinding is a necessary preventive maintenance measure for ensuring the longevity & optimal performance of engines. In Tanzania, specialized services such as crankshaft grinding, crankshaft repair, crankshaft polisher, and crankshaft inspection are readily available to address possible issues with this crucial engine component.

Over time, the crankshaft can develop wear & tear due to constant operation, which can lead to inequalities and reduced engine efficiency. By utilizing professional crankshaft grinding services in Tanzania, engine owners can have their crankshafts restored to their original specifications, eliminating any irregularities and providing smooth rotation.

This process not only enhances engine performance but also prevents further damage to other engine parts, thus significantly extending the overall lifespan of the engine. Whether it’s a regular maintenance check or addressing a specific concern, relying on experienced professionals for crankshaft services in Tanzania is a smart investment for maintaining reliable, long-lasting engines.

Contact Us for Top-notch Crankshaft Grinding Services in Tanzania

Looking for top-notch crankshaft grinding services in Tanzania? Look no further than RA Power Solutions. We specialize in comprehensive crankshaft solutions, including crankshaft grinding, repair, polishing, and inspection services.

Our team of professional technicians is equipped with state-of-the-art machinery & years of experience, ensuring preciseness and efficiency in every project. Whether you require crankshaft repair, grinding, polishing, or inspection services, we have you covered.

With our commitment to quality and customer satisfaction, you can trust RA Power Solutions to deliver outstanding results for all your crankshaft requirements in Tanzania. For more information, please email us at rajshahani@rapowersolutions.com or info@rapowersolutions.com or call us at +91 9582647131 or +91 9810012383.

FAQs

1. Do you offer on-site (in-situ) crankshaft grinding in Tanzania without removing the crankshaft?

Customers often need assurance that the grinding can be performed directly on-site—such as onboard vessels or at power plants—without dismantling the engine.

2. What size and weight capacity can you handle for crankshaft grinding?

Users frequently ask about the maximum diameter and mass of crankshafts that the service can accommodate, especially for large diesel engines (e.g., 500–700 mm diameter, up to 20 tons).

3. Do you provide crankshaft inspection and nondestructive testing before or after grinding?

Prospective clients want to know if inspections—like dimensional analysis and NDT—are included to guarantee quality and adherence to specifications.

4. Can you handle polishing or finishing to restore surface smoothness and reduce friction?

Many ask not only about grinding but also polishing services that ensure mirror-like finishes to improve engine performance.

5. Can you repair crankshafts with cracks or major damage instead of replacing them?

Customers are often interested in repair services for cracked or severely damaged crankshafts to avoid costly replacements.

The post Precision Crankshaft Grinding in Tanzania | RA Power Solutions appeared first on Rebabbitting Bearing.

Consequences Of Hand Polishing Of Crankshaft and Benefits Of Crankshaft Polishing Machine

Raj — Mon, 11 Feb 2019 20:12:40 +0000

Manufacturers of high capacity diesel engines are maintaining close tolerances in terms of taper and ovality of crankpin and main journal diameter of the crankshaft. The maintenance of close tolerances and high surface finish results in the generation of more power, longer life of crankshaft and bearing, less noise level, low vibration, friction, and better fuel efficiency. RA Power Solutions has been working on crankshafts of marine engines and engines used for various applications with diameters ranging from 30 mm to 700 mm.

On Site Crankshaft Grinding

What Goes Wrong with Hand Polishing

Based on RA Power Solutions’ decades of experience, here are the main drawbacks:

Bearing line marks and pitting remain
Minor surface damage, like line marks (from bearings) and pitting, is not removed completely by hand polishing. These defects undermine surface integrity and can lead to premature wear.
Taper and ovality get worse, not better
Crankpin and main journals often have tight tolerances for taper and ovality (i.e., deviation from perfect cylindricity or uniform diameter). Hand polishing cannot correct these and often makes them worse.
Surface finish suffers
Engine and bearing manuals usually specify key metrics like surface roughness (e.g., Ra values). Hand polishing can’t ensure you reach those finishes reliably.

What the OEMs / Manuals Require

To deliver optimal performance, crankshaft components must often meet:

Taper & ovality between 0.02 mm to 0.05 mm, depending on diameter.
Surface finish of Ra < 0.25 (unit depends on the standard, usually microns).

These are very tight tolerances, difficult to consistently achieve with hand methods.

Onsite Grinding and Polishing Machines: Key Benefits

RA Power Solutions has developed (and field-tested) portable onsite machines with capabilities for diameters from ~30 mm up to ~700 mm. Here are the advantages they bring:

Benefit	What It Means in Practice
Precision	Grinding + polishing deliver accurate, measurable correction of taper, ovality, surface finish.
Time Saved	Because you don’t need to remove the crankshaft—machine can be inserted via inspection window. Less downtime.
Longer engine / bearing life	Better surfaces, fewer defects mean less friction, wear, vibrations etc.
Cost savings	Avoid repeated failures or having to send the crankshaft out; avoid hiring expensive overseas services.
Transferable skill	Once you have the machine, your own technicians can be trained to use it—so dependence on outside vendors reduces.

Portable Crankshaft Grinding Machine by RA Power Solutions:

RA Power Solutions has introduced a portable, lightweight, onsite crankshaft grinding and polishing machine which is capable of grinding and polishing diameters ranging from 30 mm to 700mm. The onsite crankshaft grinding machine is revolutionary. You can insert this portable equipment through the inspection window of the engine block. There is no requirement for the removal of the crankshaft from the engine block.

RA Power Solutions specializes in crankshaft polishing, offering high-quality services to improve the performance and longevity of crankshafts. our skilled technicians utilize state-of-the-art equipment and cutting-edge techniques for precise and efficient crankshaft polishing. The use of a dedicated crankshaft polisher ensures that the polishing process is done with utmost precision and consistency.

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

The post Consequences Of Hand Polishing Of Crankshaft and Benefits Of Crankshaft Polishing Machine appeared first on Rebabbitting Bearing.