crankshaft grinding and repair Archives

Compressor Crankshaft Grinding and Polishing Onsite

RA Power Solutions was approached by a leading Fertilizer producing company based in north India regarding the requirement of onsite grinding and polishing of compressor crankshaft.

The company has five high-capacity CO2 compressors which have been imported from a leading company based in Europe.

Our team consisting of three technicians along with onsite crankshaft grinding equipment was deputed to the site and following was observed:

Details of CO2 Compressor Crankshaft:

S. NO	Crankshaft Details
1	Engine Make/ Model	CO2 COMPRESSOR
2	Crankpin Diameter Standard	317.30 MM
3	Crankpin Bearing Width	210.00 MM
4	Main Journal diameter	330 mm & 317.30 mm
5	Main Journal Width	370 mm & 225 mm
6	Place of execution of crankshaft repair	Fertilizers & Chemicals Plant in India

On dimensional inspection of crankpin it was observed that crankpin nos. 02 developed excessive ovality. It also had deep line marks due to the failure of bearings which are of babbitt white metal type.
All the remaining crankpins were inspected and rough surfaces including bearing line marks were observed.
The main journal having a standard diameter of 330 mm also had a rough surface and required polishing.

**Damage of crankpin no. 6 of Compressor**

**Onsite repair of damaged crankshaft of CO2 Compressor**

**Picture showing before polishing of Main Journal**

Action taken by RA Power Solutions

Considering the fact that the main journal having a diameter of 330 mm having a rough surface and bearing line marks it was decided to remove the crankshaft from the compressor.

RA Power Solutions technicians submitted a drawing of V-Block which were manufactured in the factory for placement of crankshaft.

The grinding of crankpin no. 02 was undertaken and the final dimensions were maintained between 315.58 mm to 315.60 mm. The ovality of only 0.02 mm was observed.

All the remaining 05 crankpins were polished, removing the line marks and improving the surface finish. The surface finish after polishing was observed at less than 15 RA value.

All the main journals were also polished onsite removing the ovality to some extent and improving the surface finish again to less than 15 RA value.

**Crack detection test of compressor crankshaft before grinding**

**CO2 Compressor Crankshaft Inspection and Repair on site**

Advantage of getting the crankshaft grinding/ Polishing done by RA Power Solutions

RA Power Solutions is the only company in India having experience of forty-three years in crankshaft repair.
We have ready availability of equipment up to 700 mm diameter. The equipment is portable and lightweight and can be taken to any site all over the world as accompanied baggage. The modification in the onsite crankshaft grinding and polishing equipment is possible as per the site requirement.
In this case since the main journal diameter was to be polished the V-Block was designed and fabricated onsite.
RA Power Solutions as a protocol undertakes all the checks prior to grinding and polishing like cracks by MPI, Hardness test, deflection, etc.
We also manufacture babbitt white metal bearings and do rebabbitting of old bearing up to 1500 mm diameter.

**After Grinding and polishing taken deflection of CO2 Compressor Crankshaft**

**Main Journal of CO2 compressor after polishing**

For more information on crankshaft grinding services, insitu crankshaft grinding and polishing, onsite crankshaft repair, or crankshaft polishing services email us at rajshahani@rapowersolutions.com, info@rapowersolutions.com Call at +91 9582647131,+91 9810012383.

Daihatsu 5DC-17 Undersize Bearings Availability and Crankshaft Repair

RA Power Solutions is proud to announce that we are saving the crankshaft of Daihatsu 5DC-17 from rejection by undertaking successful repair. As on date we have saved more than a hundred fifty crankshafts from rejection and have repaired them onsite without removing it from the engine block.

The Main Features of Repair of Daihatsu 5DC-17 Crankshaft by RA Power Solutions are as following:

RA Power Solutions is the only company in the world that can undertake grinding of Daihatsu 5DC-17 crankpins having a crankpin diameter of 145 mm and bearing length of only 64 mm which is considered to be very less for the placement of the on-site crankshaft grinding machine.
We have specially designed and dedicated onsite crankshaft grinding equipment which can be inserted from the engine block window to undertake the grinding of crankpins. No need for removing the crankshaft from the block & sending it to the workshop.
Damage to fillet radius is a serious issue with the crankshaft of Daihatsu 5DC-17. We undertake the repair of the fillet radius and do the grinding.
RA Power Solutions is the first and only company in the world that can undertake the grinding of crankshaft with a damaged fillet even while sailing the vessel.

Ready stock of Crankpin undersize Bearings

RA Power Solutions maintain a stock of undersize bearings which are required immediately after grinding. In most cases, we send our technicians along with the undersize bearing which facilitates immediate commissioning & operation of the engine after the grinding of crankshaft is done.
The Daihatsu 5DC-17 engine manufacturer recommends grinding of crankpin only up to 1.0 mm undersize. With our experience of more than 43 years in the repair of marine engine crankshafts, we have undersized the crankpins up to 3.0 mm and the engines are performing satisfactory.
The successful repair of the crankshaft has resulted in saving of huge amount for the owners of shipping companies.

Following Daihatsu 5DC-17 Bearings are Available and Ready in Stock.

Main Journal Bearings standard size.
Crankpin Bearings:
- 0.5 mm undersize
- 1.0 mm undersize
- 1.5 mm undersize
- 2.0 mm undersize
- 2.5 mm undersize
- 3.0 mm undersize

For your requirement of Repair of crankshaft of Daihatsu 5DC-17, bearings for Daihatsu engine and undersize crank pin bearings please contact RA Power Solutions or please Email us at rajshahani@rapowersolutions.com, info@rapowersolutions.com Call at +91 9582647131,+91 9810012383.

Repair of MAN B&W Model 5L 16-24 by Using Onsite Crankshaft Grinding Machine

MAN Engine Model no. 5L 16/24 is a very common installation on vessels and the engine is used as Generator. The Crank Pin diameter of MAN Engine Model no. 5L 16/24 is only 130mm and the bearing width is 56 mm. In other words, it is about 2 inches

This makes the onsite crankshaft repair very difficult due to limited space in between the two webs. Most onsite crankshaft repair companies based in Europe don’t have the equipment and the technology to undertake grinding/ repair of crankpin of MAN Engine Model no 5L 16/24. The repair companies always suggest to remove it from the engine block and send it to workshop for crank pin grinding or reject the crankshaft.

We successfully executed the repair of the crankshaft of MAN Engine Model no. 5L 16/24. Details are as mentioned below:

S. NO	Crankshaft Details
1	Engine Make	MAN B&W
2	Engine Model	5L 16/24
3	Crank pin Diameter Standard	130 mm
4	Crankpin Bearing Width	56 mm
5	Place of execution of crankshaft repair	Port of Castellon Spain

Details of Crankshaft repair job executed by RA Power Solutions technicians at a port of Castellon Spain.

The damaged crankpin was checked for taper & ovality and it was observed 0.49 mm.
Deep bearing line marks were observed.
All other parameters like hardness and crack detection by MPI were checked and no abnormality was found.
The crankpin was ground to an undersize of 1.0mm.

Supply of Undersize Bearing for MAN Engine Model No. 5L 16/24

It is obvious that whenever grinding is undertaken there is requirement of undersize bearing. In this case of MAN Engine Model no. 5L 16/24, RA Power Solutions arranged and supplied 1.0 mm undersize crankpin bearing to the client.

We maintain a large stock of standard & undersize bearings of crankpin & main journal of popular make & model of engines like Yanmar, Daihatsu, MAK and MAN B&W, etc.

The Engine was commissioned in presence of our technicians and performance was found to be satisfactory.

**Hardness check of crankpin MAN B&W Model 5L 16/24**

**Engine of CME-MAN B&W 5L 16/24 Crankpin grinding**

**MAN B&W 5L 16/24 Crankpin under grinding progress**

For more details on the crank pin grinding machine please email us at info@rapowersolutions.com, or rajshahani@rapowersolutions.com, Call at +91 9582647131,+91 9810012383.

Repair of Daihatsu 5Dk-20 Engine Crankshaft in Visakhapatnam

RA Power Solutions was approached by a leading shipping company regarding the problem faced by them in the crankshaft of Daihatsu 5DK-20 Auxiliary Engine.

The vessel was visiting Visakhapatnam port India and it was decided to undertake the repair of the damaged crankshaft in Visakhapatnam port.

RA Power Solutions technicians undertook the grinding of four numbers of crankpins having a standard diameter of 170 mm. Due to serious damage to the crankpin, we have to undertake the grinding of two crankpins to the undersize of 0.5 mm, and on balance two crankpins were undersized by 1.0 mm. The job of crankpin repair of Daihatsu 5DK 20 Auxilary engine was undertaken in 76 hours without holding a vessel.

**Damage of crankpin of Daihatsu Engine 5DK-20**

**Deep Bearing line marks on crank pin of Daihatsu Engine 5DK-20**

**Crack detection by MPI of Daihatsu Engine 5DK-20 crankshaft**

**Crack detection of crankpin Daihatsu Engine 5DK-20 by MPI**

**Damaged crank pin of Daihatsu Engine 5DK-20**

**Grinding of Daihatsu Engine 5DK-20 under progress**

Supply of undersized bearing of Daihatsu 5DK-20 Engine crankshaft

We have supplied the undersize bearing of the crankpin to the client and the engine is performing satisfactory.

**Crankpin of Daihatsu Engine 5DK-20 after Polishing**

**Crankpin of Daihatsu Engine 5DK-20 after grinding**

For more details of the crankpin grinding machine, crankpin polishing of daihatsu engine, daihatsu 5Dk-20 engine repair, bearing of Daihatsu 5DK-20 Engine crankshaft, or crankshaft grinding and repair email us at info@rapowersolutions.com, rajshahani@rapowersolutions.com, Call at +91 9582647131,+91 9810012383.

Crankshaft Grinding | Crankshaft Repair Services

RA Power Solutions undertakes onsite crankshaft grinding and crankshaft repair for the diameter ranging from 30 mm to 700 mm.

The small diameter crankshaft is repaired on site without removing the crankshaft from the block. These services are of great use for the engines which are installed in construction-related equipment, compressors, and diesel-driven equipment operating in remote areas.

Our crankshaft repair services of crankshaft grinding and crankshaft repair are proven as we have been extending these services all over the world for the last forty years.

The main feature of onsite crankshaft grinding, onsite crankshaft repair, crankshaft polishing are as following:

RA Power design and manufactures on site crankshaft grinding equipment as per the site requirement and space constraints Hence there is no compromise with the quality after the repair of the crankshaft.
All the parameters of the crankshaft grinding are maintained strictly as per the manufacturer’s recommendations and tolerances. An inspection report in detail is submitted to the client.
In RA Power Solutions, we give great importance to the calibration of the crankshaft and inspection in detail by experienced technicians which helps us to plan the right strategy and selection of the right equipment for onsite grinding and onsite repair of crankshaft.
We possess the latest breed of inspection instruments including the instruments for the NDT test which helps us to find out the exact fault in the crankshaft resulting in successful repairs.
Replacement of crankshaft in case of breakdown by new crankshaft or reconditioned crankshaft is our expertise. The crankshaft of an auxiliary engine can also be replaced while sailing the vessel.

**Inspection of Crankpin is in Process**

**Grinding of Crankpin by Crankshaft Grinding Machine is in Process**

Our services for crankshaft grinding and repair are available 24*7. Technicians can fly down with portable lightweight crankshaft grinding machine in short notice to all over the world as they carry Indian CDC.

We have been regularly working for various models of engines like Wartsila, Daihatsu, MWM, Caterpillar, MaN, MaK, B&W, Sulzer, Bergen, Detroit Diesel, Stork Werkspoor, Pielstick, Deutz, Yanmar, MTU, Cummins, Nohab Polar, Caterpillar, Mitsubishi, Yanmar, MaK 551, MaK 552, MaK 453, MaK 451 AK, MaK 452 AK, Deutz 540, Deutz 358, Deutz 350, Pielstick PC 2.2 PC 2.5, Wartsila 524, Wartsila 824 TS, Sulzer 6 AL 25/30 and many more.

For more details regarding crankshaft grinding please email us at rajshahani@rapowersolutions.com, or info@rapowersolutions.com, or call us at +91 9582647131 or +91 9810012383.

**Crankshaft Grinding Service on Moving Vessel**

Crankshaft Repair Services And Tools

Crankshaft repair is required in case of the following abnormalities observed in the crankshaft

Development of taper and ovality in crankpin and main journal of the crankshaft in access of tolerances stipulated by the manufacturer.
Development of bearing line marks, pitting, and rough surface.
Damage of radius profile due to accident or seizure of bearing of crankpin or main journal.
Development of crack and variation in hardness of the crankpin and main journal of the crankshaft.
Loss of alignment of the crankshaft.

Crankshaft repair is undertaken by RA power solutions of the crankpin and main journal of the crankshaft diameter ranging from 35mm to 700mm. Crankshaft repair is undertaken by experienced technicians who have been specifically trained in our workshop on a dummy crankshaft, the company has experience of more than four decades in crankshaft repair services.

The on-site grinding equipment designed and manufactured by RA power solutions can maintain a close tolerance after crankshaft grinding within 0.02mm and the surface finish which is far superior to international standards. The crankshaft grinding machine has a main frame manufactured out of titanium steel which makes it lighter and vibration-free during operation. The grinding of the crankshaft is possible even while sailing of the vessel and there is no requirement of holding the vessel at anchor or a port for crankshaft repair.

RA Power Solutions is a leading provider of specialized crankshaft repair services and innovative crankshaft repair tools. With a team of highly skilled technicians and engineers, we offer comprehensive solutions for repairing damaged or worn-out crankshafts in various industries. From onsite inspections to comprehensive repairs, we are equipped to handle all aspects of crankshaft maintenance. Our advanced crankshaft repair tools, designed with precision and durability in mind, streamline the process, guaranteeing swift yet reliable service.

All the crankshafts repaired by RA power solutions are guaranteed for a satisfactory performance we have successfully executed more than 10,000 crankshaft repair jobs. The services of crankshaft grinding and crankshaft repair are offered at low cost and our technicians carry CDC of Indian origin, Panama, and Pallav.

Contact numbers for rajshahani@rapowersolutions.com, info@rapowersolutions.com, and +91 9582647131 and +91 9810012383 are available for more information on crankshaft repair services.

Crankshaft Repair | Crankshaft Grinding and Crankshaft Polishing – RA Power Solutions

The concept of onsite repair of crankshaft is getting popular with the introduction of a portable lightweight on-site crankshaft grinding machine. Now it is possible to undertake crankshaft repair, crankshaft grinding and polishing on site without dismantling the crankshaft from the engine.

On-site Crankshaft Repair, Crankshaft Grinding, and Crankshaft Polishing costs low with minimum downtime and inconvenience as it does not require removal of crankshaft from the engine block, packing, and transportation to the designated workshop for repair by grinding or polishing process.

Advantage of trusting RA Power solutions

First company based in Asia having experience of four decades in Crankshaft Repair, Crankshaft Grinding and Crankshaft Polishing.
All repairs of crankshaft and process followed for grinding of crankshaft and polishing of crankshaft are approved by class agencies of repute like DNV, Lloyds and various inspecting organisations spread all over the world.
The repair of crankshaft is executed with a guarantee for the satisfactory performance, the pre and final inspection reports before and after grinding and polishing crankshaft are submitted.
Technicians executing the repair of crankshaft onsite are highly skilled, trained in our factory on a dummy crankshaft in order to understand the techniques for successful repair of the crankshaft. Some of our technicians have experience of more than 45 years.
The onsite inspection and polishing of crankshaft repair is recommended to enhance the life of crankshaft and bearings.
RA power solutions offer and undertake inspection and polishing of crankshaft on board a vessel at a nominal cost.
During our working of four decades on diesel power plant, shipping companies we have undertaken Crankshaft Repair, Crankshaft Grinding and Crankshaft Polishing number exceeding more than 10,000.

Conclusion:

RA power solutions has team of technicians with valid CDC from Panama, Palau, and India and can travel all over the world with short notice.

For more details regarding crankshaft grinding, on site crankshaft repair, onsite crankshaft grinding and polishing please email us at rajshahani@rapowersolutions.com, or info@rapowersolutions.com, or call us at +91 9582647131 or +91 9810012383.

Crankshaft Repair | Crankshaft Grinders | Onsite Crankshaft Machining

RA Power Solutions undertakes the Grinding of Crankshaft of High Capacity Engines used in Shipping companies, Power plants, and in various other sectors. The company has experience of more than forty years in undertaking successful repair of Crankshafts and major components. As we are aware Crankshaft is the heart of the engine and is the most expensive part with limited availability of particular make and model.

Our expertise lies in the repair of crankshafts that meets with a serious accident like a Seizure of a bearing. It is generally observed that due to rubbing of the bearing steel surface with the CR Pin diameter, excessive heat is generated. Thus there is an increase in Hardness. Every manufacturer specifies the maximum limit of Hardness.

Damaged CrankPin of Mirrlees Blackstone Engine

In the case of Mirrlees Blackstone K and KV, major series of engines, the normal hardness at the time of manufacturing of the crankshaft is between 21.5 to 26 on HRC Scale (241 to 268 on the HB scale). It is obvious that after the seizure of the bearing, the hardness increases even to the level of 45 to 50 HRC.

The Mirrlees Blackstone allows the higher hardness under a deviation maximum of up to 32 HRC against the standard of a maximum of 26 HRC. In normal situations as per the manufacturer, the crankshaft stands rejected as it has far higher Hardness than the stipulated in the manual.

Field Instruction for Crankshaft Rehabilitation of Mirrlees Blackstone Engine

RA Power took the following action to save the Crankshaft.

The Hardness was taken on various spots, not having a gap of more than 15 mm.
Hardness was recorded and a maximum hardness of 50 HRC was observed.
Since bearing line marks, taper, and ovality on the crank pin were observed, the grinding was undertaken and CR Pin dia was reduced by 3.5 mm approx.
The Hardness was reduced and the maximum Hardness of 42 HRC was observed in a few spots. Although the 42 HRC Hardness was on the higher side than the maximum limit of 32 HRC specified by the manufacturer. The Crankshaft was accepted under deviation due to the following reasons:
1. The higher Hardness was observed in a scattered pattern.
2. The higher hardness was away from the Lubricating Oil Hole and radius fillet of the CR Pin which are considered to be critical Zone.

The versatility of RA Power Solutions crankshaft grinders caters to a wide range of marine and industrial crankshafts, irrespective of their size and design.

The Crankshaft was accepted and his performance is observed as satisfactory from last more than three and half years. The saving of the Crankshaft from rejection was possible only due to the Experience RA Power Solutions has of successful repair of more than ten thousand crankshafts.

RA Power Solutions undertakes Crankshaft Repair, Crankshaft Grinding and offers Onsite Crankshaft Machines to repair companies. We are a leading provider of crankshaft grinding and repair services, specializing in utilizing state-of-the-art crankshaft grinders.

With our state-of-the-art crankshaft grinders and highly skilled technicians, we can accurately recondition damaged or worn-out crankshafts to the original manufacturer’s specifications. By using advanced techniques and precision machinery, RA Power Solutions ensures that the repaired crankshafts regain their perfect alignment, surface finish, and dimensional integrity. Whether it’s a large marine engine or a compact generator, their expertise and commitment to quality make them a reliable choice for any crankshaft-related concerns.

With the use of RA Power Solutions crankshaft grinders, a significant decrease in downtime and repair costs can be achieved, allowing businesses to maintain productivity and efficiency.

Note: The writer of this article is Mr. Raj Shahani, Managing Director of RA Power Solutions Pvt Ltd.

Grinding & Repair of Crankpin is in Process

Finished Crankpin after Grinding & Repair

For more details on in situ crankshaft grinding and repair, crankshaft grinders, crankshaft grinding repair services, or crankshaft machining contact today by email us at rajshahani@rapowersolutions.com, or info@rapowersolutions.com, or call us at +91 9582647131 or +91 9810012383.

Crankshaft Grinding Services by Experienced Technicians – RA Power Solutions

When it comes to maintaining marine engines, one vital aspect that deserves the utmost attention is the crankshaft. The crankshaft plays a crucial role in converting linear motion to rotational motion, and any wear or damage to this component can lead to a significant decrease in engine performance. However, thanks to the expertise of experienced technicians and specialized services like Crankshaft Grinding, marine engine owners can revitalize their crankshafts and restore optimal engine functionality. In this blog, we will delve into the significance of crankshaft grinding services and how they can breathe new life into your marine engines.

RA Power Solutions provides onsite crankshaft grinding services for last four decades. Crankshaft having diameter up to 700 mm is repaired onsite without removing the crankshaft from the engine block.

The grinding of crankshaft onsite is possible by introduction of onsite crankshaft grinding machine which is portable, light weight and can be inserted from the inspection window of the engine block. RA Power Solutions also manufactures and sells crankshaft grinding machine. The crankshaft grinding services are offered by us through our technicians who are well trained in our workshop and have experience of providing crankshaft grinding services for last 30 to 35 years. After repair of crankshaft, the dimensional tolerances are maintained within 20 to 30 microns and surface finish as per the international standards.

Prior to undertaking grinding of crankshaft, all the major parameters of crankshaft i.e. dimensional inspection, hardness test, crack detection, deflection, etc. are checked.

In case the basic parameters are found within the repair limits, crankshaft grinding is undertaken. RA Power Solutions can maintain the tolerances strictly as per the manufacturer’s recommendations. With the introduction of latest design of onsite crankshaft grinding machine the vibrations in the crankshaft grinding machine are reduced to minimum. This ensures maintenance of close tolerance and also facilitates grinding of crankshaft on board a vessel while it is sailing in high seas. The grinding of crankshaft while sailing of the vessel results to the considerable saving to the owners.

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

Crankshaft Grinding and Crankshaft Repair by Experienced Technicians – RA Power Solutions

Crankshaft grinding and crankshaft repair are important for satisfactory performance of engine. RA Power Solutions Pvt. Ltd. has been undertaking crankshaft repair onsite by portable, light weight crankshaft grinding machine. The crankshaft repair is executed of crankshaft diameter ranging from 60 mm to 700 mm.

We have team of trained and dedicated technicians who are deputed to the site with crankshaft grinding machine along with necessary instruments. The crankshaft repair is undertaken without removing the crankshaft from the entablature.

Crankshaft Grinding of Wartsila Diesel Engine

The crankshaft grinding machine used to undertake crankshaft repair is of latest design having minimum vibrations. This facilitates our technicians to undertake crankshaft repair even while the vessel is sailing. The tolerance after crankshaft grinding and crankshaft repair is maintained within 10 to 20 microns in terms of taper and ovality.

The repair of crankshaft and overhauling of engine while sailing of the vessel between two ports results to the considerable saving to the ship owners as there is no need of holding the vessel at port or anchorage.

The crankshaft repair executed by us is guaranteed for the satisfactory performance. As on date we have executed more than 10,000 repair of crankshaft all over the world.

Crankshaft Grinding of MAN Diesel Engine

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