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.
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.
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.
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.
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.
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.
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 firstname.lastname@example.org
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.
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.
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 email@example.com
Crankshaft grinding is undertaken by RA Power Solutions having four decades of experience in repair of crankshaft. We have technicians who are trained in our workshop giving them the on job training for Grinding of crankshaft and repair of Crankshaft.
We use latest design of crankshaft grinding equipment which is vibration free and is capable to maintain close tolerances in terms of taper and ovality. Crankshaft grinding and crankshaft polishing is done in one setting thus reducing the time of crankshaft repair considerably.
Crankshaft grinding and crankshaft repair is also undertaken on board the vessel and while the vessel is sailing.