Crankshaft repair is required in case of following abnormalities observed in the crankshaft – RA Power Solutions

  • Development of taper and ovality in crankpin and main journal of the crankshaft in access of tolerances stipulated by 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.

The on-site grinding equipment designed and manufactured by RA power solutions can maintain the close tolerance after crankshaft grinding within 0.02mm and the surface finish which is far superior to the international standards. Crankshaft grinding machine has a main frame manufactured out of titanium steel which makes it lighter and vibration free during operation. The grinding of 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.

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 on low cost and our technicians carry CDC of Indian origin, Panama, and Pallav.

Crankshaft repair
Crankshaft repair
On-site crankshaft repair
On-site crankshaft repair
Crankshaft repair machining
Crankshaft repair machining

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 of 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 offers and undertakes inspection and polishing of crankshaft on board a vessel on 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 within a short notice

On site crankshaft grinding
On-Site Crankshaft Grinding
Crankpin grinding and polishing
Crankpin grinding and Polishing
On-site crankshaft repair
On-site crankshaft repair

Crankshaft Repair | Crankshaft Grinding | Onsite Crankshaft Machining – RA Power Solutions

RA Power Solutions undertakes 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 repairs of Crankshaft and major components. As we are aware Crankshaft is a heart of engine and is most expensive part with limited availability of particular make and model.

Damaged CrankPin of Mirrlees Blackstone Engine
Damaged CrankPin of Mirrlees Blackstone Engine
Inspection of Crankpin Under Process
Inspection of Crankpin Under Process

 

 

 

 

 

 

 

 

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

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

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

Field Instruction for Crankshaft Rehabilitation of Mirrlees Blackstone Engine
Field Instruction for Crankshaft Rehabilitation of Mirrlees Blackstone Engine

RA Power took the following action to save the Crankshaft.

I.) The Hardness was taken on various spots, not having gap of more than 15 mm.

II.) Hardness was recorded and maximum hardness of 50 HRC was observed.

III.) Since  bearing line marks, taper and ovality on the crank-pin was observed, the grinding was undertaken and CR Pin dia was reduced by 3.5 mm approx.

IV.) The Hardness was reduced and the maximum Hardness of 42 HRC was observed on few spots. Although the 42 HRC Hardness was on higher side, then the maximum limit of 32 HRC specified by the manufacturer. The Crankshaft was accepted under deviation due to following reasons

a)  The higher Hardness was observed in a scattered pattern.

b) 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 Crankshaft was accepted and his performance is observed as satisfactory from last more than three and half years.

The saving of Crankshaft from rejection was possible only due to the Experience RA Power solutions has of successful repair of  more than ten thousand crankshaft.

RA Power Solutions undertakes Crankshaft Repair, Crankshaft Grinding and offer Onsite Crankshaft Machines to the repair companies.

Grinding of Crankpin is in Process
Grinding of Crankpin is in Process by RA Power Solutions

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

Website: http://www.rapowersolutions.com/ and he is instrumental in saving  number of Crankshafts from rejection.

Grinding & Repair of Crankpin is in Process
Grinding & Repair of Crankpin is in Process
Finished Crankpin after Grinding & Repair
Finished Crankpin after Grinding & Repair

Insitu Crankpin Grinding | Crankpin Repair | Marine and Industrial Engine – RA Power Solutions

RA Power Solutions undertake crankpin polish and crankpin grinding of crankshaft for four stroke and two stroke for marine and industrial diesel engines.

We work on medium and high capacity diesel engines having capacity of more than 400 KW. In terms of diameter we can undertake crankpin polish and crankpingrinding onsite for the diameters ranging from 60 mm to 700 mm.

Crankshaft Grinding and Polishing with Highest Precision

The crankpin grinding and crankpin polishing for marine and industrial application is undertaken by onsite crankshaft grinding machine. The diameter, surface finish and all parameters are maintained strictly as per the manufacturer’s specifications. Each job of crankpin polishing and crankpin grinding is executed with the greatest care because inexpertly repair of crankshaft can lead to the premature failure of the bearing causing considerable consequential damage. In fact with four decades of experience in the field of crankshaft grinding and crankshaft repair our experts technicians guarantee machining of crankshaft to the highest professional standards.

Damage Crankpin of Wartsila 12V32
Damage Crankpin of Wartsila 12V32
Insitu Crankshaft Grinding Machine from Crankcase Window
Insitu Crankshaft Grinding Machine from Crankcase Window

 

 

 

 

 

 

 

 

Cost Effective Crankshaft Grinding Services

In spite of constantly executing the repairs as per the OEMs standards with the highest quality demand we as an Indian company are considered to be the lowest price wise in comparison to the companies based in Europe, Singapore and other countries. We have executed successfully repair of over 10,000 crankshafts which is a testimony of confidence on us by clients based all over the world.

Inspection and Grinding of Crankpin of Wartsila Engine is in Process
Inspection and Grinding of Crankpin of Wartsila Engine is in Process

 

Services Related to Repair and Overhauling of Engine

RA Power Solutions offers all the services related to repair and overhauling of medium and high speed engines which includes following:

I)Insitu crankshaft repair, crankshaft grinding and crankshaft polishing up to 700 mm diameter.

II) Engine block repair by metal stitching and metal locking, line boring and other process.

III) Repair of major parts like cylinder heads, connecting rods, cylinder liners, etc.

IV) Repair and overhauling of diesel engines

All the repairs and services offered by RA Power Solutions are supported with guarantee.

We extend services all over the world including Nigeria, Singapore, Indonesia, Germany, Taiwan, Belgium, Korea, Ecuador, Brazil, Mexico, Myanmar, Greece, Spain, Finland, Netherlands, Oman, Dubai, Iran, Egypt, Russia, Philippines etc.

For more information, please email us on info@rapowersolutions.com

Grinding of Crankpin Under Process
Grinding of Crankpin Under Process
Finished Crankpin of Wartsila Engine After Onsite Grinding
Finished Crankpin of Wartsila Engine After Onsite Grinding

Insitu Crankpin Machining – RA Power Solutions

Sulzer model 6RTA Engine was reported damaged in high seas near Mombasa on a transit to Sri Lanka. On investigation, it was observed that the connecting rod bolts got sheared damaging lower and upper engine block and three crankpins of the Crankshaft.

Team of RA Power Solutions technicians having experience of undertaking in-situ crankpin machining and a team undertaking repair of crack and damaged engine block by metal stitching and metal locking process was deputed on board a vessel within a short notice as all of them have a seamen passport.

Repair of Engine Block by Metal Stitching Process
Repair of Engine Block by Metal Stitching Process

On preliminary examination multiple cracks on upper and lower crack case of engine block were observed measuring in totality 2900 mm in terms of length. Three crankpins were damaged developing taper and ovality exceeding more than 1 mm. RA Power Solutions team of technicians worked non-stop and executed the repair of crankpins by onsite crankshaft grinding machine. All pins were undersized to 1.5 mm due to the damage.

Grinding of Crankpin on Board a Vessel
Grinding of Crankpin on Board a Vessel
Crankpin After Grinding by Crankshaft Grinding Machine
Crankpin After Grinding by Crankshaft Grinding Machine

 

 

 

 

 

 

 

The engine block cracks were repaired by metal locking and metal stitching process. The complete job was executed within 68 hours. The hard work, knowledge, experience, sincerity of technicians have been very much appreciated by the owners. This achievement was possible due to RA Power Solutions having latest design of equipment, experienced technicians having Indian CDC.

For more information, please email us on info@rapowersolutions.com