Crankshaft Repair in Limited Engine Space

RA Power Solutions Pvt. Ltd. have successfully executed repair of crankshaft on board a vessel of Hyundai engine. The crankshaft repair companies based in Norway, Singapore and UK were invited to execute the grinding operation on crankshaft bearings of which were seized due to lube oil pump failure.These companies were not able to execute the repairs due to non availability of compact portable tool which was required as the space available from the inspection window was less.

Hyundai Diesel Engine for Repair
                           Hyundai Diesel Engine for Repair

Knowing the constraints of space, RA Power Solutions Pvt. Ltd. designed  and manufactured a special purpose crankshaft grinding machine which was inserted from the inspection window and grinding of 6 nos. pins was successfully executed. The engine is performing satisfactory.

The repair of crankshaft on site was possible because the crankshaft grinding machine designed by RA Power solutions was compact, light weight and was manufactured according to the size of the window and space available in the crankcase of the engine. The technicians were able to maintain the tolerance after grinding within 20 microns against the stipulated tolerance of 30 microns in the manufacturers manual.

Repair of Crankshaft in Limited Space
Repair of Crankshaft in Limited Space
Inspection for Crack Detection
Inspection for Crack Detection
CR Pin After Grinding
                                                    CR Pin After Grinding

New and Reconditioned Cylinder Liners

New and Reconditioned Cylinder Liners
     New and Reconditioned Cylinder Liners

Cylinder liners for popular engines like MAN-B&W, Sulzer, Wartsila, Mak, Deutz, Pielstick, Mitsubishi, Daihatsu, Yanmar, Bergen, Niigata, Himsen, Allen, Stork, Fiat, MWM, Hanshin, Caterpillar, SKL, Ruston, Paxman, Crepelle, Mirrlees, Alco, ABC, Crepelle, Nohab are manufactured by RA Power Solutions Pvt. Ltd.

The cylinder liners are centrifugally cast, machined and honed in-house. RA Power Solutions manufacturers cylinder liners up to 500 mm bore with height of 1500 mm. Cylinder liners are regularly exported.
RA Power Solutions Pvt. Ltd. also supplies second hand and reconditioned cylinder liners. Each cylinder liner is subject to crack detection test by MPI and Dye penetrant inspection. Cylinder liners are honed. We ensure that the remaining life of the cylinder liners is more than 80% and the cost is approximately 1/3rd of the new cylinder liners.

The reconditioned cylinder liners are popular and used in large by the shipping companies, diesel power plants having engines which are old and companies have stopped production.

Revolution in Crankshaft Grinding

revolution in engineering 11

Good News for Shipping Companies, Power Plants and Repair Workshops.

Crankshaft grinding machine up to 700 mm diameter is designed, developed and manufactured by RA Power Solutions. Machine is having following features:

Crankshaft Grinding Machine Design: Machine is portable; light weight and can be carried to the site. Nowadays, there is no need of disassembly of complete engine.

Operation of Crankshaft grinding machine: The machine is operated pneumatically or by electrical motor. The design is so simple and machine can be easily operated by a skilled technician.

Quality: Crankshaft grinding machine is capable of maintaining close tolerance in terms of taper and ovality up to 20 microns and can also achieve the surface finish as per the International standards.

Training: RA Power Solutions Pvt. Ltd. provides training to the clients, technicians for the duration of 3 days. The assembly, operation and maintenance of the machine are explained.

Cost of Machine: Presently, shipping companies, power plants having high capacity diesel generating sets have no option but to call for the technicians from the companies based in Norway, Singapore, UK and various countries by paying exorbitant amount and travel expenses. The Crankshaft grinding machine is manufactured by RA Power Solutions is very reasonably priced and the cost can be recovered in 1 or 2 jobs of repairs.

We have supplied more than 60 Insitu crankshaft grinding machines all over the world which are performing satisfactory.

Disassembly of Crankshaft Grinding Machine with Pneumatic Motor
Disassembly of Crankshaft Grinding Machine with Pneumatic Motor
Disassembly of Crankshaft Grinding Machine
Disassembly of Crankshaft Grinding Machine

 

 

 

 

 

 

Assembly of Crankshaft Grinding Machine in Progress
Assembly of Crankshaft Grinding Machine in Progress
Assembly of Crankshaft Grinding Machine with Pneumatic Motor
Assembly of Crankshaft Grinding Machine with Pneumatic Motor

 

 

 

 

 

 

 

Packing in Progress- Insitu Crankshaft Grinding Machine
Packing in Progress- Insitu Crankshaft Grinding Machine
Onsite Crankshaft Grinding Machine Ready for Dispatch
Onsite Crankshaft Grinding Machine Ready for Dispatch

 

 

 

 

 

 

 

 

WORKING OF ONSITE CRANKSHAFT GRINDING MACHINE (400-450mm)

Metal Stitching of Crack Casting

In case of crack developed in casting of mechanical equipments the repair of metal stitching and metal locking is proved to be the best and successful process. In case of engine block and turbine casings, heavy castings is used in mechanical equipments. It is quite difficult to replace them due to cost, time factor and interchangeability issue.

Metal Locking of Wartsila Diesel Engine
Metal Locking of Wartsila Diesel Engine

The repair of cracks by metal stitching and metal locking is a cold process. No heat is generated and the same original profile is maintained. In case of cracks developed in housing of engine block, the crack repaired by metal locking and metal stitching is highly recommended as there is no distortion in the central line of the housing takes place.

Metal Stitching of Jenbacher Engine Block
Metal Stitching of Jenbacher Engine Block
Metal Stitching of Jenbacher Engine Block Under Process
Metal Stitching of Jenbacher Engine Block Under Process

RA Power Solutions have experienced technicians to undertake metal stitching and metal locking process with guarantee.

New and Reconditioned Marine Engine Spares

RA Power Solutions have been working on high capacity diesel engine for last more than 3 decades. The genuine and high quality spares are very important for satisfactory performance of engine.

RA Power Solutions Pvt. Ltd. deals in spare parts and supporting equipments of following engine: MAN-B&W, Sulzer, Wartsila, Mak, Deutz, Pielstick, Mitsubishi, Nohab, Daihatsu, Yanmar, Bergen, Crepelle, Niigata, Himsen, Allen, Stork, MWM, Hanshin, Caterpillar, Ruston, Paxman, Mirrlees, Alco, Fiat, ABC, Crepelle, SKL, etc.

The spare parts are procured from the OEMs and inspected at our works by the experienced technicians. Generally, these parts are 20 to 30% cheaper than the engine manufacturers.

RA Power Solutions also deals in reconditioned spare parts. The engines which are not in operation are sourced parts are calibrated and reconditioned as per the manufacturers specifications.

We strongly feel that considering the high cost of new spare parts, it is advisable to use the reconditioned parts which are calibrated and are within the manufacturer’s specifications. This again saves the operation cost considerably.

Following new and reconditioned spare parts of high capacity diesel engine are available in stock.

  • PISTON RODS
  • CAMSHAFTS
  • CYLINDER HEADS
  • CONNECTING RODS
  • CYLINDER LINERS
  • CRANKSHAFTS
  • COMPLETE AUXILIARY ENGINES
  • ENGINE FRAME AND BEDPLATES
  • FUEL PUMPS
  • PISTONS

 

PISTON RODS
PISTON RODS
CAMSHAFTS
CAMSHAFTS
CYLINDER HEADS
CYLINDER HEADS
CRANKSHAFT
CRANKSHAFT

 

 

 

 

 

 

 

CYLINDER LINERS
CYLINDER LINERS

 

 

 

White Metal Babbitt Bearing

White metal Babbitt Bearing            White-metal-Bearings-300x198

White metal Babbitt bearing is used in engines, turbines, alternator, pumps and various other Rotating equipments. It is important that the grade and quality of white metal which is used for babbitting of bearing is selected based on the load characteristics, operational condition on the Babbitt bearing.

The white metal babbitting is done by centrifugal system and this ensures that the Babbitt white metal bonds properly with the steel base of the bearing. The quality of Babbitt bearing is checked by ultrasound for bonding.

RA Power Solutions Pvt. Ltd. undertakes babbitting of white metal bearing up to 1500 mm inner diameter. The babbitting is done by the experienced technicians and is done by centrifugal process which ensures that Babbitt white metal forms a uniform layer. The grade and quality of white metal used for babbitting is carefully selected.

The in-house machining facility ensures that all the parameters of bearings are maintained as per the manufacturer’s specifications and tolerances.

Portable Crankshaft Grinding and Polishing Machine

The large bench type crankshaft grinding and polishing machines are outdated and are replaced by portable, light weight onsite grinding and polishing machine. The machine is driven either by pneumatic motor or is electrically operated.

The objective of using pneumatic motor is to make machine compact which can be inserted from the inspection window of the engine block for grinding of crankpin and main journal.

Pneumatic Motor Mounted on Machine
Pneumatic Motor Mounted on Machine

Crankshaft Grinding and Polishing Machine is light weight and can be carried to the work site by the technicians. It is easy to assemble and operate. Any technician with machine shop experience can easily operate this machine. The crankshaft grinding and polishing machine is capable of maintaining taper, ovality and high surface finish after grinding operation and all the dimensions of crankpin or main journal can be controlled as per the manufacturer’s requirement.

Assembly of Insitu Crankshaft Grinding Machine
Assembly of Insitu Crankshaft Grinding Machine

RA Power Solutions Pvt. Ltd. designs and manufactures the onsite crankshaft grinding and polishing machine as per the customer’s requirement. We have capability of designing and manufacturing the grinding machine up to 700 mm in terms of diameter.

More than 60 crankshaft grinding and polishing machines have been supplied all over the world which are performing satisfactory. The cost of on site crankshaft grinding and polishing machine is very low.

Importance of Hardness in Crankshaft

Crankshaft

The hardness of crank pin and main journal of crankshaft is of great importance for the satisfactory performance of the crankshaft. In case of low RPM diesel engine, the crankshafts are not hardened and the hardness is achieved by the metallurgical properties. In case of high RPM engine, crankshafts are hardened. The most common process followed by the manufacturers of crankshaft is to go for induction hardening.

Due to seizure of bearings, the temperature goes high and the hardness increases. The increase in hardness makes the crankshaft brittle resulting to the development of crack.

RA Power Solutions Pvt. Ltd. suggests that whenever seizure of bearings takes place it is important that crankshaft hardness is checked and presence of crack should also be checked either by dye penetrant process or Magnaflux.

Author is Managing Director of RA Power Solutions Pvt. Ltd. having almost four decades of hands on experience in providing consultancy, repair and supply of new and reconditioned crankshafts for high capacity diesel engine. More than 2000 crankshaft have been successfully repaired all over the world, some of which were even rejected by reputed engine manufacturers.

Crankshaft Repairs Made Easy

Crankshaft grinding and polishing is an important activity which is required after running of engine for a long time as due wear and tear taper and ovality is created. Again in case of failure of bearing grinding and polishing of crankshaft is required. In olden times it was necessary to remove the crankshaft from the block and send it to the designated workshop for grinding and polishing.

The removal of crankshaft from the block involved disassembly of complete engine, packing and transportation to the workshop resulting to high down time and expensive. RA Power Solutions has developed, design and manufactured on site crankshaft grinding machine which can undertake grinding of crank pins or journals up to the diameter of 700 mm. The machine is capable of maintaining the tolerance within 0.02 mm in terms of taper and ovality. It is very easy to operate and needs minimum training.

The machine is light in weight can be taken to the site. The machine is in two parts and can be inserted in the engine block through the inspection window facilitating grinding of CR Pin without removal of crankshaft. The grinding and polishing is undertaken by same machine. RA Power Solutions suggest to polish and grind if necessary the crankshaft whenever it is open for major overhauling. This will considerably enhance the life of crankshaft, bearing and engine. The machine gets drive from a pneumatic turbine which is again light weight. The drive is also given by a electrical motor where the air supply is not available. The assembly of the machine and its operation can be seen on a YouTube channel

https://www.youtube.com/channel/UCxcP2Jc6DGFdpBokIcxVyBg

RA Power Solutions has supplied more than 100 machines to the clients based all over the world who are more than satisfied with its performance, quality and ease of operation.

Introduction to RA Power Solutions Pvt. Ltd., India

Company is providing on site repairs of major components of diesel engine, pumps, compressors and all type of rotary equipments mainly crankshaft, engine block, cylinder heads, liners. The repairs are undertaken by trained and experienced technicians equipped with latest breed of specially designed and developed portable machining equipments. Repairs are executed strictly as per the guidelines and tolerances stipulated by the manufacturers. Company is involved in supplying spare parts and supporting equipments used in diesel power plant. The parts and the supporting equipments are directly sourced from the OEMs and are competitively priced. White metal bearings are manufactured as per the drawing or sample. Rebabbitting of old bearing is undertaken by centrifugal process. The white metal used is sourced from the reputed companies and in house facilities for quality checks are in place.