Consequences of Hand Polishing of Crankshaft & Benefits of Onsite Polishing Machine- RA Power Solutions

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 have been working on crankshafts of marine engines and engines used for various applications with the diameter ranging from 30 mm to 700 mm.

In general following close tolerance of crankpin and main journal are observed:

I) Taper and ovality of crankpin and the main journal are maintained between 0.02 mm to 0.05 mm depending on the diameter of crankpin and main journal.

II) The surface finish of less than 0.25 RA value is maintained.

RA Power solutions have observed that sometimes due to an emergency, to put back the engine into operation, the crankshaft crankpin and main journal are hand polished by emery paper, nylon rope and other means. This has serious consequences on CR pin and main journal. Few of them are as follows:

I) Bearing line marks, pitting marks are observed on crankpin and main journal of crankshaft cannot be removed by hand polishing.

II) It is our experience that in case of development of taper and ovality, it can never be reduced and controlled by hand polishing. On the contrary ovality and taper increases.

III) The surface finish of the crankpin and main journal is of great importance.

IV) It is observed that by hand polishing the marks can never be removed fully. Thus the desired surface finish as per the manual cannot be maintained.

RA Power solutions, during their work on high capacity engines installed with clients spread all over the world, have observed that in most of the cases hand polishing rather deteriorates the condition of crank pin and main journal and in some cases results in the rejection of crankshaft.

Recently one of our client having 3 generators of MAN B&W 8L 23/30 had a problem in all crankpins having a standard diameter of 185mm. Bearing line marks and the rough surface was observed. All the crankpins were hand polished by nylon wire and new bearings were used. The crankshaft failed within 20 minutes of the operation of the engines. Few photographs are given below:

Bearing Line Marks Observed in Crankpin
Bearing Line Marks Observed in Crankpin
Rough Surface Observed in Crankpin of MAN B&W 8L 2330 Engine
Rough Surface Observed in Crankpin of MAN B&W 8L 2330 Engine

 

 

 

 

 

 

 

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

 

 

 

 

 

 

 

 

Introduction of Portable Crankshaft Grinding Machine by RA Power Solutions

RA Power solutions have introduced portable, lightweight onsite crankshaft grinding and polishing machine which is capable of grinding and polishing the diameter ranging from 30 mm to 700mm. The onsite crankshaft grinding machine is revolutionary portable equipment which can be inserted from the inspection window of the engine block. There is no requirement of removal of crankshaft from the engine block.

On site crankshaft grinding and polishing machine is easy to operate and we also extend training to the buyer’s technicians. Inviting companies for polishing of crankshaft is no more required as it can be undertaken by your technicians with the portable onsite crankshaft grinding machine. You can save on the exorbitant amounts charged by European companies, which was their monopoly till the last few years.

More than 70 machines have been sold all over the world and are operating successfully.

Accessories of Crankshaft Grinding Machine
Accessories of Crankshaft Grinding Machine
Portable Onsite Crankshaft Grinding Machine
Portable Onsite Crankshaft Grinding Machine

 

 

 

 

 

 

 

The author is Mr. Raj Shahani, Managing Director of RA Power Solutions Pvt. Ltd. He has 40 years of experience in working on large crankshafts and Diesel Engines.He is on the board of directors of reputed shipping companies and companies having a large number of Diesel power plants.

The crankshaft grinding and polishing machine has been developed through a consistent and focused R&D with field trials undertaken in different conditions.

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

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 … Continue reading “Consequences of Hand Polishing of Crankshaft & Benefits of Onsite Polishing Machine- RA Power Solutions”

Crankshaft Reconditioning | Crankpin Reconditioning & Crankpin Machining by Crankshaft Grinder – RA Power Solutions

To avoid crankshaft from rejection or to reduce the minimum diameter of Crankpin and Main journal after grinding companies all over the world are approaching RA Power solutions for onsite repair of the crankshaft.

Ra Power solutions is having the expertise of successfully repairing more than 10,000 crankshafts for different applications and diameter ranging from 30 mm to 700 mm. There are companies based in Europe who had the monopoly in onsite grinding and repair of crankshaft and were charging exorbitantly. By introduction of onsite repair of the crankshaft, RA Power Solutions has bought a revolution by executing onsite crankshaft repair far better than the international standards and with the lowest price. In this time of recession when the shipping companies and large industries are passing through difficult times repair of crankshaft, maintenance and overhauling of diesel engine and all services related to engine room offered by RA Power has resulted to considerable savings for the shipping companies and heavy Engineering organizations having Diesel power plants.

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

We follow the below mentioned procedure for successful onsite repair of crankshaft:
I) Thorough cleaning of Crankshaft/Main Journal which is damaged.
II) Visual inspection of radius fillet, lubrication oil hole, surface finish, and other parameters of Crankpin and Main journal.
III) Conducting of NDT test by qualified technicians with latest instruments for crack repair, hardness test, surface finish, dimensional inspection, etc.
IV) Selection of correct onsite tooling to execute the grinding and polishing.
V) Final inspection by senior technicians of crankshaft and preparation of reports.
All the crankshaft reconditioning jobs undertaken by RA Power Solutions are guaranteed for the satisfactory performance.

Onsite Crankshaft Grinding while Vessel is on Move
Onsite Crankshaft Grinding while Vessel is on Move
Crankpin After Grinding by Onsite Crankshaft Grinder
Crankpin After Grinding by Onsite Crankshaft Grinder

 

 

 

 

 

 

 
RA Power Solutions is the only company in the world which apart from providing onsite repair services also sells onsite crankshaft grinding machine capacity ranging from 30 mm to 700 mm. More than seventy crankshaft grinder machine have been sold worldwide. Hundreds of technicians have been trained to execute successful repairs of crankshaft onsite.

Onsite Crankshaft Grinding Machine Offered by RA Power Solutions
Onsite Crankshaft Grinding Machine Offered by RA Power Solutions

To avoid crankshaft from rejection or to reduce the minimum diameter of Crankpin and Main journal after grinding companies all over the world are approaching RA Power solutions for onsite repair of the crankshaft. Ra Power solutions is having the expertise of successfully repairing more than 10,000 crankshafts for different applications and diameter ranging from … Continue reading “Crankshaft Reconditioning | Crankpin Reconditioning & Crankpin Machining by Crankshaft Grinder – RA Power Solutions”

White Metal Babbitt Bearing | Rebabbitting of Bearing – RA Power Solutions

White metal babbitt bearings are manufactured by RA Power Solutions for all applications like engine, pumps, turbine, alternator and rotatory equipments.

The white metal babbitt bearings are manufactured as per the drawing or as per the sample of the bearings of the equipments which are no more produced by the original manufacturer. Stringent quality control norms are followed at the time of manufacturing of white metal bearings. The centrifugal system followed for rebabbitting of white metal is used which ensures a excellent bonding between the base metal and white metal.

The white metal after centrifugal casting has a dense surface without any pin holes or blow holes which results to the satisfactory performance and long life of the white metal babbitt bearing.

The rough and final machining and maintenance of various critical dimensions are maintained by using in-house latest design of equipment.

White metal babbitt bearings are manufactured as per the international standards maintaining the close tolerances. We have the facility to manufacture white metal babbitt bearing up to the outer diameter of 1500 mm.

Rebabbitting of old white metal bearings is undertaken which develop taper and ovality or get damaged

We are exporting bearings regularly to Singapore, Indonesia, Nigeria, UK, South America, Sri Lanka, Greece, Dubai, Qatar, etc.

For more information, please email us on info@rapowersolutions.com or call us on +91-9213604692

White metal babbitt bearings are manufactured by RA Power Solutions for all applications like engine, pumps, turbine, alternator and rotatory equipments. The white metal babbitt bearings are manufactured as per the drawing or as per the sample of the bearings of the equipments which are no more produced by the original manufacturer. Stringent quality control … Continue reading “White Metal Babbitt Bearing | Rebabbitting of Bearing – RA Power Solutions”

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

 

Damaged Crankpin of MAN Engine
Damaged Crankpin of MAN Engine

Development of Taper and Ovality is common in Crankshaft which gets developed due to continuous running of the engine. 

RA Power Solutions is having experience of forty years in onsite Grinding and polishing of Crankshaft diameter ranging from 30 mm to 700 mm. The Onsite Grinding and repair is executed by experienced technicians. We use portable crankshaft grinding machine which is specially developed to undertake Crankshaft grinding and Crankshaft polishing within the tolerances stipulated by the manufacturer.
 
It is possible to undertake Crankshaft grinding and Crankshaft polishing while the Vessel is sailing.
Onsite Grinding of Crankshaft While Vessel is Sailing
Onsite Grinding of Crankshaft While Vessel is Sailing
Inspection of Crankpin Before Grinding
Inspection of Crankpin Before Grinding

 

 The Crankshaft grinding machine used for Crankshaft repair is manufactured of Titanium alloy which absorbs the vibrations and facilitates to maintain the close tolerance within 20-30 microns. We are the world leaders in Onsite Repair and offer Crankshaft Grinding Services on the lowest price with international standard. All the Crankshaft repairs undertaken by us are guaranteed for satisfactory performance of Crankshaft and engine.
For more information, please email us on info@rapowersolutions.com
Onsite Crankshaft Grinding Repair Machine
Onsite Crankshaft Grinding Repair Machine
Inspection of Crankpin After Grinding
Inspection of Crankpin After Grinding

  Development of Taper and Ovality is common in Crankshaft which gets developed due to continuous running of the engine.  RA Power Solutions is having experience of forty years in onsite Grinding and polishing of Crankshaft diameter ranging from 30 mm to 700 mm. The Onsite Grinding and repair is executed by experienced technicians. We use … Continue reading “Crankshaft Machining | Crankshaft Grinding Services | Onsite Crankshaft Repair Services – RA Power Solutions”

Crankpin Grinding by Crankshaft Grinding Machine – RA Power Solutions

Diesel power plant based in northern India having 10 nos. of 12.3 MW Wartsila diesel generating sets reported severe causality involving one of their Wartsila generator.

RA Power Solutions team of technicians rushed to the power plant with the measuring instruments and onsite crankshaft grinding equipment to access the cause of breakdown.

Wartsila Diesel Generating Sets Installed in Plant
Wartsila Diesel Generating Sets Installed in Plant

On undertaking the detailed inspection of crankshaft including dimensional check, hardness test, MPI for crack and deflection, it was observed that one of the crankpin journal was damaged due to the failure of big end bearing.

Following were the main observations:

I) Taper and ovality in crankpin was observed as 0.70 mm.

II) Due to failure of bearing, deep line marks were visible.

III) Hardness and MPI test was done, no cracks were observed.

Damaged Crankpin of Wartsila Engine
Damaged Crankpin of Wartsila Engine

RA Power Solutions used latest design of onsite crankshaft grinding machine having almost no vibrations. The crankpin was undersized by 1.5 mm maintaining the tolerance within 10 microns. Our technicians took only 18 hours to complete the Crankshaft repair from the time of start of preliminary inspection, grinding and final inspection. The repair of crankpin in such a short time was possible due to the latest technology onsite crankshaft grinding machine used and experience of our technicians. The engine was assembled and is performing satisfactory.

Inpection of Crankpin is in Process
Inpection of Crankpin is in Process
Crankpin Grinding is in Process by RA Power Engineer
Crankpin Grinding is in Process by RA Power Engineer

RA Power Solutions is having four decades of experience in working on crankshaft of high capacity main and auxiliary engines. The technicians are trained in the factory to execute the repair of crankshaft strictly as per the manufacturer’s specifications and tolerances.

We are the leaders in this field and our prices are most competitive.

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

Crankpin After Grinding by Onsite Crankshaft Grinding Machine
Crankpin After Grinding by Onsite Crankshaft Grinding Machine
Grinding of Crankpin by Crankshaft Grinding Machine
Grinding of Crankpin by Crankshaft Grinding Machine

Diesel power plant based in northern India having 10 nos. of 12.3 MW Wartsila diesel generating sets reported severe causality involving one of their Wartsila generator. RA Power Solutions team of technicians rushed to the power plant with the measuring instruments and onsite crankshaft grinding equipment to access the cause of breakdown. On undertaking the detailed inspection of crankshaft including dimensional … Continue reading “Crankpin Grinding by Crankshaft Grinding Machine – RA Power Solutions”

Training on Operation of Crankshaft Grinding Machine – RA Power Solutions

Onsite crankshaft grinding machine is manufactured and marketed by RA Power solutions having more than four decades of experience in extending the services of repair of crankshaft, grinding and polishing of crankpin and main journal.

Crankshaft Grinding Machine for Repair & Grinding of Crankshaft
Crankshaft Grinding Machine for Repair & Grinding of Crankshaft

The onsite crankshaft grinding machine is manufactured having range starting from 30 mm to 700 mm in terms of diameter. The smaller diameter of onsite crankshaft grinding machine up to 100 mm are more suitable for grinding and polishing of crankshafts used in construction equipments, compressors, pumps, etc.

The crankshaft grinding machine having range of 100 mm and above is ideal to undertake crankshaft repair, crankpin grinding and polishing of marine engines and heavy duty rotating equipments.

RA Power Solutions has recently supplied crankshaft grinding machine ranging from 220 to 260 mm Diameter to a Bangladesh based client. This is the first onsite crankshaft grinding machine to be sold in Bangladesh where number of diesel generating sets are in operation and having large population of vessels passing through the various ports of Bangladesh.

Crankshaft Grinding Machine is in Operation While Training
Crankshaft Grinding Machine is in Operation While Training
Inspection of Crankpin Before Grinding
Inspection of Crankpin Before Grinding

The onsite training on operation and maintenance of crankshaft grinding machine is of great help to the buyers as within a short time of 1 week the technicians learned as how to operate the onsite crankshaft grinding machine and to maintain.

Since the bench type crankshaft grinding machines are outdated and are replaced by compact, portable, easy to operate in-situ crankshaft grinding machine. It has bought a revolution in this area as the cost of repair of crankshaft and downtime of the marine engine has been reduced drastically.

Grinding of Crankshaft by Crankshaft Grinding Machine on Vessel
Grinding of Crankshaft by Crankshaft Grinding Machine on Vessel
Crankpin After Grinding and Polishing by Crankshaft Grinding Machine
Crankpin After Grinding and Polishing by Crankshaft Grinding Machine

 

 

 

 

 

 

 

The maintenance of the crankshaft grinding machine equipment is easy and is explained in detail to the technicians operating the machine.

For manufacturing of onsite crankshaft grinding machine the raw material is selected in order to keep the machine weight to the minimum and to meet with the stress at the time of grinding and polishing of the crankshaft. The main parts of the crankshaft grinding machine are manufactured of titanium and ferrous alloys.

The easy operation, low price, training on the job to the buyer’s technicians have made it popular and as on date more than 70 crankshaft grinding machines have been sold all over the world.

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

Onsite crankshaft grinding machine is manufactured and marketed by RA Power solutions having more than four decades of experience in extending the services of repair of crankshaft, grinding and polishing of crankpin and main journal. The onsite crankshaft grinding machine is manufactured having range starting from 30 mm to 700 mm in terms of diameter. … Continue reading “Training on Operation of Crankshaft Grinding Machine – RA Power Solutions”

Wartsila 6R32 Crankshaft Repair – RA Power Solutions

A continuous process industry based in western India using 2 units of Wartsila 6R32 for their power requirements reported breakdown of one of the Wartsila 6R32 diesel generating set.

Repair of Wartsila 6R32 Diesel Engine
Repair of Wartsila 6R32 Diesel Engine

RA Power Solutions team of senior technicians was deputed with portable inspection instruments and onsite crankshaft grinding and polishing machine. Following observations were reported on inspection of crankpins:

Inspection of Spare Parts of Wartsila Diesel Engine
Inspection of Spare Parts of Wartsila Diesel Engine

I) On investigation of Wartsila diesel generating sets, it was observed that it was clear case of lube oil pump failure.

II) All 6 crankpins were found damaged.

III) Inspection in detail was carried out. Gist of which is as following:

a) Crankpin no. 1 ovality of 0.76 mm. No cracks observed. Hardness within limits.

b) Crankpin no. 2 ovality of 0.54 mm. No cracks observed. Hardness within limits.

c) Crankpin no. 3 ovality of 0.26 mm. No cracks observed. Hardness within limits.

d) Crankpin no. 4 ovality of 0.49 mm. No cracks observed. Hardness within limits.

e) Crankpin no. 5 ovality of 0.29 mm. No cracks observed. Hardness within limits.

f) Crankpin no. 6 ovality of 0.62 mm. No cracks observed. Hardness within limits.

After initial inspection of crankshaft, it was decided to undertake the repair of crankshaft of Wartsila 6R32 by grinding the crankpin.

Three nos. of pins were ground undersize by 1mm and balance 3 were undersized by 0.5 mm. The taper, ovality and surface finish has been maintained far better than manufacturer’s recommendations.

The above job was executed in record time of 6 days.

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

Grinding of Crankpin by Crankshaft Grinding Machine
Grinding of Crankpin by Crankshaft Grinding Machine
Surface Finish Inspection after Grinding
Surface Finish Inspection after Grinding

A continuous process industry based in western India using 2 units of Wartsila 6R32 for their power requirements reported breakdown of one of the Wartsila 6R32 diesel generating set. RA Power Solutions team of senior technicians was deputed with portable inspection instruments and onsite crankshaft grinding and polishing machine. Following observations were reported on inspection … Continue reading “Wartsila 6R32 Crankshaft Repair – RA Power Solutions”

Crankshaft Repair Machine – RA Power Solutions

RA Power manufactures crankshaft repair machine which is a latest solution for repair of damaged crankpin and main journal of crankshaft onsite. The crankshaft repair machine  is available in the range from 60 mm to 700 mm which caters to almost all the capacities of engines installed on board a vessel in power plants and other applications. The crankshaft repair machine has following features:

I) The crankshaft repair machine (crankshaft grinding/crankshaft polishing machine) is developed out of our experience, extensive field applications and research.

II) Light weight portable crankshaft repair machine can be carried to any site all over the world.

III) Crankshaft repair machine is compact and is placed on crank pin from inspection window of the crankcase for grinding and polishing. There is no requirement of dismantling of the crankshaft from engine block.

IV) The crankshaft repair machine is of latest design which results to almost no vibration. The tolerances in terms of taper and ovality are controlled within 0.02 mm or as per the requirement of engine manufacturer.

V) The crankshaft grinding and polishing machine is easy to operate and understand. Training is an integrated package of this product.

VI) The machine is recommended and has proved its worth in different applications like land based engine, process industry, shipping, etc.

VII) Cost effective and perhaps this is the first revolutionary crankshaft grinding equipment which is affordable for the repair workshops,shipping companies,Power plants and repair industry.

We have supplied more than 65 crankshaft repair(Crank shaft grinding and crankshaft polishing machine all the world.

Onsite Crankshaft Grinding and Polishing Machine

Crankshaft Grinding Machine Ready for Dispatch

Crankshaft Grinding & Polishing Machine Accessories

 Grinding of Crankpin is in Process by Crankshaft Repair Machine

RA Power manufactures crankshaft repair machine which is a latest solution for repair of damaged crankpin and main journal of crankshaft onsite. The crankshaft repair machine  is available in the range from 60 mm to 700 mm which caters to almost all the capacities of engines installed on board a vessel in power plants and … Continue reading “Crankshaft Repair Machine – RA Power Solutions”

Reconditioned Diesel Engine Spare Parts – RA Power Solutions

RA Power Solutions have been providing repair and reconditioning services for last 40 years.

Inspection of Engine Components
Inspection of Engine Components

We have in-house facilities to inspect, calibrate and repair if required the major spare parts of diesel engine. The experienced engineers who have worked for reputed engine manufacturers like Wartsila, Cummins, Caterpillar are engaged in inspection and repair of engine components. The in-house latest technology equipments facilitate us to maintain the tolerances strictly as per the manufacturer’s specifications.

In fact we regularly receive a feedback from our clients confirming that the reconditioned spare parts supplied are as good as new spare parts.

The reconditioned spare parts of diesel engine are not only priced lower than the cost of the new spare parts but their availability is of great advantage to the ship owners and plants. Following diesel and marine spare parts are available in our stock:

Crankshaft , Cylinder head , Piston Pin , Piston Ring , Connecting Rod , Cylinder Liner , Engine Bearings , Engine Valves, Fuel injection Systems Parts , Cylinder Head Gasket Sets , Cylinder Block , Cylinder Cover , Camshaft, etc.

Inspection of Connecting Rod
Inspection of Connecting Rod
Inspection of Connecting Rod & Bearing
Inspection of Connecting Rod & Bearing

 

 

 

 

 

 

 

We can supply spare parts of all popular make of Diesel engines and supporting equipments.

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

Inspection of Crank Pin
Inspection of Crank Pin
Reconditioning of Piston
Reconditioning of Piston

RA Power Solutions have been providing repair and reconditioning services for last 40 years. We have in-house facilities to inspect, calibrate and repair if required the major spare parts of diesel engine. The experienced engineers who have worked for reputed engine manufacturers like Wartsila, Cummins, Caterpillar are engaged in inspection and repair of engine components. The … Continue reading “Reconditioned Diesel Engine Spare Parts – RA Power Solutions”

Babbitt Bearing – RA Power Solutions

Babbitt bearing has vast application in power plants, heavy machinery, diesel engines, etc. It is important that the selection of Babbitt white metal is done in  accordance with the application of the bearing, RPM of the shaft, load and various design aspects.

Alternator Bearing of Wartsila Diesel Engine
Alternator Bearing of Wartsila Diesel Engine

RA Power Solutions Pvt. Ltd. manufactures white metal Babbitt bearing having diameter up to 1500 mm. The outer steel casing material is selected according to the application. The grade of white metal is again determined by the design parameters. The Babbitt white metal is imported by us from a leading manufacturing company based in Spain. The babbitting of white metal on the steel casing is done by centrifugal system which ensures that babbitt white metal is bonded strongly with the casing. The white metal babbitting by centrifugal system is proved and widely used in the industry. The thickness of white metal is maintained as per the requirement.

RA Power Solutions Pvt. Ltd. has in house facilities to carry out various machining operation after white metal babbitting is done. The bore size is maintained within the tolerances as per the manufacturer’s requirement.

Journal Bearing of Marine Engine
Journal Bearing of Marine Engine

The rebabbitting of old bearings is also undertaken. The old Babbitt white metal is removed and steel casing is subject to inspection for presence of any crack, higher hardness, deformation of profile, etc. In case all the parameters required are within limits of the steel casing the rebabbitting of white metal is undertaken using the same grade of white metal or superior grade of babbitt white metal in order to ensure far better performance after rebabbitting of old white metal is done

We export new Babbitt bearings and also undertake rebabbitting of old bearings for the reputed companies based all over the world.

We are quality conscious and are very competitively priced with minimum delivery period.

Crankshaft Bearing Under Rebabbitting Process
Crankshaft Bearing Under Rebabbitting Process
Crankshaft White Metal Babbitt Bearing
Crankshaft White Metal Babbitt Bearing
Inspection of White Metal Bearing
Inspection of White Metal Bearing
Pedestrial Bearing for Rebabbitting
Pedestrial Bearing for Rebabbitting

 

 

Babbitt bearing has vast application in power plants, heavy machinery, diesel engines, etc. It is important that the selection of Babbitt white metal is done in  accordance with the application of the bearing, RPM of the shaft, load and various design aspects. RA Power Solutions Pvt. Ltd. manufactures white metal Babbitt bearing having diameter up … Continue reading “Babbitt Bearing – RA Power Solutions”