Details of Inspection of Yanmar Engine 8N280L crankshaft undertaken by RA Power Solutions technicians on board the vessel.

• The vessel reported damage to two crankpins due to the failure of the oil pump initially two crankpins were inspected and ovality ranging from 0.23 to 0.30 mm was found.
• Since it was a failure of lubricating the oil pump decision was taken to open the connecting rods of the remaining six crankpins and inspect them by taper & ovality.
• On inspection of the remaining six crankpins, it was observed that all the crankpins had excessive ovality higher than the permissible limits stipulated in the Yanmar Engine manufacturer manual.
• The bearing line marks a rough surface was also observed.
• The hardness was checked with the portable hardness tester and was observed within limits except for the few scattered high hardness spots.
• MPI for crack detection was also done and no cracks were observed.
• The radius fillet of all eight crankpins was checked.
• In case two crankpin radius fillet profiles were damaged. The reading observed of eight crankpins before grinding is as follows.

SIZE OF CR JOURNAL BEFORE GRINDING                                                                        SIZES IN MM

Action taken by RA Power Solutions technicians to repair the crankshaft of Yanmar Engine 8N280L is as follows:

• All the crankpin grinding was undertaken to the first under the size of minus 0.50 mm.
• The tolerance of diameter was maintained as mentioned in the manual.
• The radius fillet profile of two crankpins was corrected.
• The final dimensions after grinding are as follows:

Achievement of RA Power Solutions technicians in the successful repair of the Crankshaft of Yanmar Engine 8N280L while sailing

The vessel after discharging the cargo at Chennai port left for Port Klang Malaysia. The technicians worked nonstop and completed the grinding of all eight crankpins including the formation of radius fillets while sailing.

Our equipment for onsite crankshaft grinding is designed to absorb the vibration during the sailing of a vessel with RA Power Solutions technicians and equipment on board the vessel there is no need to hold the vessel.

We have been regularly executing on site crankshaft repairs and crankshaft grinding in Dubai, Oman, Saudi Arabia, Qatar, Abu Dhabi, Sharjah, Ajman, Umm Al-Quwain, and Fujairah, Bahrain, Kuwait, Iraq, Antigua and Barbuda, Belize, Dominica, Dominican Republic, Grenada, Guyana, Haiti, Jamaica, Saint Kitts and Nevis, Saint Lucia, Saint Vincent and the Grenadines, Trinidad, and Tobago, etc.

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

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The major specifications of the Yanmar crankpin and engine are mentioned below:

As can be seen from above the crankpin diameter is only 140 mm with a bearing length of 72 mm. Most of the companies undertaking onsite repair of crankshaft don’t have the equipment to undertake onsite grinding & polishing of crankpins having 140 mm diameter & 72 mm bearing width which is considered to be small.

RA Power Solutions has the equipment, technology, and process to undertake the grinding & polishing repair of crankpins having a small diameter and crankpin width of as low as 50 mm and has successfully repaired and saved thousands of crankshafts from rejection. Our two technicians boarded the vessel at Mundra Port India and executed the repairs by grinding the crankpin up to 2.0 mm undersize.

Ready Availability of Undersize Crank Pin Bearing for Yanmar S185L Engine and other make engines

Understanding the importance of timely availability of undersize crankpin bearings required after grinding, RA Power Solutions maintains a stock of undersize crankpin Bearings up to 2.0 mm. In most cases, our technicians travel to the site with undersized bearings. This avoids the delay in the commissioning of the engine.

For more details on the crank pin grinding and crankshaft repair and supply of undersize Bearing, Yanmar S185L- ST Engine Crankshaft, please email us at rajshahani@rapowersolutions.com, or info@rapowersolutions.com, or call us at +91 9582647131 or +91 9810012383.

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Major Yanmar S185L-ST Engine Details are as Following

On inspection of the crankshaft, the following were the main observations

• On the visual inspection of crankpin no. 1 having a standard diameter of 140 mm and bearing width of 62 mm, it was observed that the big end bearing failed and bearing material got embedded on the crankpin no.1 journal surface.
• The crank pin journal surface had multiple bearing line marks, was rough, and was severely scored.
• The radius fillet of both sides was damaged losing its original profile.
• Considering this to be a serious accident, all the connecting rods were disassembled and crank pins were subject to thorough inspection by our technicians.
• No deviations were observed in other crankpins on dimensional inspection.
• The hardness of crankpin no.1 was checked after removing the bearing from the crankpin journal which got embedded due to seizure of the bearing and observed within a limit.
• The crack detection test was done by a high-intensity magna flux torch and MPI equipment.
• No abnormality or cracks were observed.
• This was a big relief to our technicians as considering the serious nature of the accident, surface cracks in crank pin no. 1 were expected.
• Deflection of the crankshaft was taken and was observed within limits.

Following are the Readings Observed

The Crankpin no.1 was subject to dimensional inspection and the following readings were observed.

• Crankpin no. 1, Minimum diameter observed before repair – 139.50 mm
• Crankpin no. 1, Maximum diameter observed before repair – 139.88 mm
• Total ovality observed – 0.50 mm, considering the standard diameter of 140 mm.

Crankpin Repair Undertaken by RA Power Solutions for Successful Operation of Crankshaft of Yanmar S185L-ST Engine

• Initially, the crank pin having a standard diameter of 140 mm and bearing width of only 62 mm was ground to 0.50 mm under size with the hope the scratches and deep line marks would be removed.
• Since even after grinding 0.50 mm, the deep line marks were visible, it was decided to undersize the crank pin further by 0.5 mm.

Finally, Crankpin no. 1 was Ground to 1 mm Undersize, and Dimensions Were Maintained as Following After Grinding

• Minimum diameter observed after grinding – 138.98 mm
• Maximum diameter observed after grinding – 139.00 mm
• Maximum ovality observed – 0.02 mm

The undersized bearing of 1 mm was supplied by RA Power Solutions from their stock and the engine was put back into operation.

Main Features of Executing Successful Crankpin Repair of Yanmar S185L-ST Engine

• The company has experience of more than four decades in the field of crankshaft repair having experienced technicians trained in in-house training school.
• Manufactures its own on-site crankshaft grinding machine using it for the last 25 years. This facilitates us even to grind shafts in the limited space available.
• Only company in the world that can undertake the grinding of small diameter and main journal like in the case of Yanmar S185L-ST having a diameter of 140 mm and bearing length of only 62 mm. This needs a compact on-site crankshaft grinding machine.
• The only company in the world that can execute the grinding of crankshaft while the vessel is on the move maintaining the tolerance of 0.01/0.02 mm with a surface finish of less than 20 RA value.
• Maintaining under size and special size of bearings in stock, hence no time is wasted to put back the engine into operation.
• All technicians having Indian CDC can fly to any destination in the world on short notice.
• The on site crankshaft grinding machine is carried by our technicians as accompanied baggage and no need to book the machine in cargo and waste time in customs clearance etc.
• Light-weight machines cost less in terms of air freight charges towards transportation.
• We are considering offering our services at the lowest cost in the world.
• For a reduction in cost of the maintenance and to put back engines into operation, contact us.

We have been executing the repairs in Laos, Lebanon, Malaysia, Maldives, Mongolia, Nepal, North Korea, Oman, Philippines, Qatar, Russia, Saudi Arabia, Singapore, South Korea, Sri Lanka, Syria, United Arab Emirates, Yemen, etc. For more information about the crankshaft of Yanmar S185L-ST Engine, and Crankpin Repair, please email us at rajshahani@rapowersolutions.com, or info@rapowersolutions.com, or call us at +91 9582647131 or +91 9810012383.

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Due to the non-availability of tooling with the leading crankshaft engine repair companies, they generally advise removing the crankshaft from the engine block and sending it to the workshop for grinding and polishing purposes. We have observed in some cases even advice for replacement of the crankshaft is also given. This suggestion works out to be very expensive and time-consuming, especially in this time of recession.

Compact onsite crankshaft grinding machine designed by RA Power Solutions

RA Power Solutions Pvt. Ltd. Is the only company in the world that designs and manufactures its crankshaft grinding machines in technical collaboration with a leading Italian company.

The grinding machine manufactured by us can easily grind onsite even with a small diameter of 35 mm and a bearing width of 25 mm. This is a technological revolution and advancement done by RA Power Solutions engineers out of their experience, knowledge, and passion to do something new and different.

It’s our business to undertake regular grinding and polishing of crankshafts all over the world. We are sharing below details of a few engine crankshafts that got damaged and were successfully repaired by us. On going through the crankpin diameter and crankpin bearing width, one will observe that they are quite small.

The crankshaft grinding machine manufactured by us is used by our technicians who are trained in our in-house training school. For your requirement of onsite repair of a crankshaft up to 700 mm in terms of diameter, contact RA Power Solutions.

About Blog Author

This blog is written by Mr. Raj Shahani (Managing Director of RA Power Solutions). He has more than forty years of experience in the field of engine repair and is a technical adviser to various shipping and heavy industries based all over the world. For more information, please email us at rajshahani@rapowersolutions.com, or info@rapowersolutions.com, or call us at +91 9582647131 or +91 9810012383.

The post Crankshaft Engine Repair | Small Diameter and Bearing Width appeared first on Crankshaft Grinding Repair.

A team of two technicians along with an onsite crankshaft grinding machine capable of undertaking the reconditioning of the crankshaft of Yanmar 6M220L-SN were deputed on the vessel to undertake the inspection and evaluate the extent of damage. The crankshaft was inspected for the following major parameters and inspection reports on RA Power Solutions Pvt. Ltd. Format was prepared.

Steps were taken for inspection and testing of the crankshaft of Yanmar 6M220L-SN

• Inspection of the diameter of all six crankpins for taper and ovality.
• Visual inspection of crankpins to check the damage to radius fillet, lubricating oil hole, counterweight bolts, and adjacent area.
• Hardness testing of crankpins with special attention near the radius fillet and lubricating oil hole.
• Crack inspection by Magna flux and high-intensity torch.
• Deflection reading to check the alignment.

The main observation of the crankshaft of Yanmar 6M220L-SN

• Since all the crankpins had ovality ranging from 0.15 to 0.25 mm. All the crankpins were undersized to the size of 0.4 mm.
• All the parameters including dimensions were checked after the repairs and recorded.
• The undersized bearings were supplied by RA Power Solutions.
• RA Power Solutions Pvt. Ltd. technicians always carry with them the instruments to check the connecting rod’s big end and small end bore and also to inspect the bearing thickness and other parameters. On getting the dimensions and tolerances within limit the engine was assembled and put on a trial load.
• Performance of engine observed satisfactory.

Trust the heart of your engine Yanmar 6M220L-SN crankshaft to the competent and experienced company. RA Power Solutions has the experience, and the necessary equipment to save the heart of the engine i.e. crankshaft.

The brief of facilities available with us is as follows  

• Our own designed and manufactured onsite crankshaft grinding machines have diameters ranging from 35 mm to 700 mm. Changes can be made for small bearing widths or space.
• Machine manufactured of titanium alloy absorbing the vibration.
• Grinding and polishing are possible while sailing the vessel.
• The only company in the world undertaking onsite grinding and polishing of the crankshaft designing and manufacturing their tooling and equipment. Experience of forty years saved 10,000 crankshafts all over the world; it’s a record.
• All technicians are trained in-house training school.
• An ISO 9001:2015 certified company has won many awards.
• Maintaining far better specifications after crankshaft repair than engine manufacturer.
• All technicians have a seaman book, no need for a visa, and can board the vessel in the shortest possible time.
• Cheapest in the world. Save the cost of crankshaft repair, and contact the leaders.

For more information, please email us at rajshahani@rapowersolutions.com, or info@rapowersolutions.com, or call us at +91 9582647131 or +91 9810012383.

The post Yanmar 6M220L-SN Crankshaft Grinding and Crankshaft Repair appeared first on Crankshaft Grinding Repair.

RA Power Solutions is the only company in the world that designs and manufactures onsite crankshaft grinding machines ranging from 35 mm to 700 mm in terms of diameter. The design and manufacturing of crankshaft grinding equipment for small diameters and with hands-on expertise, facilities, and experience is done by us. We were recently approached by one of our clients regarding the failure of YANMAR Diesel Engine 6N18AL-DV 450 kva. crankshaft.

The crankshaft’s major details are as follows

As we can see from the above table YANMAR Diesel Engine 6N18AL-DV 450 kva has a crankpin diameter of 145 mm and a bearing width of only 65 mm.

The team of RA Power Solutions technicians was sent on board the vessel which was sailing near the SUEZ canal on-boarding the vessel, the inspection of the crankshaft was conducted, and the following observations were made.

• All the crankpins having a diameter of 145 mm and bearing width of only 65 mm had bearing line marks, pitting, taper, and ovality ranging from 0.16 to 0.28.
• The crankpin hardness and crack detection by MPI were done and no abnormality was observed.
• The deflection readings were observed within limits.
• It was decided to undertake the grinding of all the crankpins to the next undersize of 0.40 mm. All the crankpin diameter was maintained at 144.60 mm.
• The engine was assembled and load trials were taken.

Successful crankshaft grinding and crankshaft polishing of Yanmar diesel engine 6N18AL-DV 450 kva.

The machine manufactured by us is designed to be accommodated on the crankpin diameter and is capable of maintaining the tolerance within 0.02 mm. To our knowledge, none of the crankshaft grinding companies possess compact equipment. For your requirement of grinding of crankshafts of small diameter and bearing width contact RA Power Solutions.

This blog is written by Mr. Raj Shahani (Managing Director of RA Power Solutions). He has more than forty years of experience in the field of engine repair and is a technical adviser to various shipping and heavy industries based all over the world. For more information, about the Yanmar diesel engine and repair of the diesel crankshaft, please email us at rajshahani@rapowersolutions.com, or info@rapowersolutions.com, or call us at +91 9582647131 or +91 9810012383.

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