Action taken by RA Power Solutions to repair the crankshaft of MAK 8CM32C :

RA Power Solutions deputed two technicians with an onsite crankshaft grinding machine, instruments, and necessary consumables.

Upon arrival, they inspected the crankshaft of a damaged diesel generating set of MAK 8CM32C.

The details of the job are as follows:

The dimensional inspection of the damaged and seized crankpin number #7 was conducted.

• Dimensional checks revealed:

Minimum Diameter: 279.68 mm

Maximum Diameter: 280.00 mm

Ovality: 0.32 mm

Apart from an ovality of 0.32 mm, the crankpin exhibited deep scoring marks and a rough surface, which was developed due to seizure of the bearing.

• The hardness was checked and showed marginally higher values in certain spots.
• MPI for crack detection was undertaken and revealed no cracks or abnormalities.
• The remaining crankpins were also inspected for taper and ovality and all within acceptable limits.

Action taken for the successful repair of the crankshaft of MAK 8CM32C :

i) The grinding of crankpin number #7 was ground to an undersize of 3 mm; this was done as the deep line marks were present at every step.
They got cleared only after grinding the crankpin to 3 mm undersize, resulting in a final diameter of 277.00 mm.

ii) The remaining crankpins were polished to improve surface finish and reduce the ovality by 0.01/0.02 mm.

The above job of crankshaft repair of MAK 8CM32C has been executed strictly as per the requirements of the manufacturers and the tolerance specified.

Successful Worldwide Onsite Crankshaft Repairs

RA Power Solutions has successfully executed onsite crankshaft grinding and repair of MAK, MAN, Daihatsu, and Yanmar engines in over 100+ countries worldwide. Our services are trusted across India, UAE, Singapore, Colombia, Indonesia, Malaysia, Bangladesh, Saudi Arabia, Qatar, Kenya, Nigeria, Greece, Turkey, Spain, the UK, USA, Brazil, and many more.

For expert onsite crankshaft grinding of MAK 8CM32C engine repair and other crankshaft repair services, contact RA Power Solutions today.

Our team is available 24/7 to provide prompt support worldwide, ensuring high-quality, reliable, and cost-effective solutions.

Call us at +91-9582647131 or email info@rapowersolutions.com.

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The Auxiliary engine number #02 of MAN B&W 5L 16/24 was stopped due to low air pressure, two of our technicians boarded the vessel and inspected the crankshaft. All Five (5) crankpins having a standard diameter of 130.00 MM had ovality ranging from 0.10 MM to 0.40 MM, which is considered to be on the higher side. The crankpins also had bearing line marks, rough surfaces, and localized damage, as the engine was operated in spite of the problem in the crankshaft.

The dimensional Report of crankpins is pasted below:

The hardness and MPI for crack detection was conducted and no abnormality was observed. Technicians started onsite grinding of crankpins were ground ranging from 1.0 MM undersize to 1.50 MM.

The main advantage of onsite crankshaft grinding jobs executed by RA Power Solutions is that the technicians and equipment are trained and designed to execute the job even while sailing of the vessel. There was absolutely no requirement of holding of the vessel. RA Power Solutions also supplied the undersized crankpin bearings for this engine and it was commissioned in a short notice.

RA Power Solutions with experience of more than 44 years extends onsite crankshaft grinding services to leading shipping companies, power plants and heavy industries all over the world.

For more information regarding crankshaft grinding services, please contact us at rajshahani@rapowersolutions.com or info@rapowersolutions.com or call us at +91 9582647131 or +91 9810012383.

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Yanmar 6N18AL-UV crankshaft has a small diameter of 145.00 MM and a bearing width of only 64.00 MM, which requires a specially designed onsite crankshaft grinding machine. RA Power Solutions as a Manufacturer of onsite crankshaft grinding machines deputed two (2) technicians with the on site crankshaft grinding equipment and measuring instruments to repair the crankshaft.

Following are the Major Observations of the Damaged Crankshaft of Yanmar 6N18AL-UV

1. The crankpin number #02 was badly damaged due to the seizure of the bearing, the ovality more than 0.39 was observed. This crankpin due to seizure also had deep line marks.
2. All other parameters like hardness were observed within limits, and no cracks were found in the MPI test. The remaining Five (5) crankpins were also inspected and ovality up to 0.09 MM was observed.

Action Taken By RA Power Solutions to Repair the Yanmar 6N18AL-UV Crankshaft

1. Crankpin number #02 was ground to the third (3rd) undersize of 143.40 mm, thus reducing the diameter of the crankpin by 1.60 MM.
2. All other crankpins were polished by our specialized onsite crankshaft grinding and polishing equipment to remove the rough surface, line marks, etc.

Supply of Undersize Crankpin Bearings

RA Power Solutions technicians carried with them two (2) pairs each of 1.20 MM, 1.60 MM and 2.00 MM bearings. This helped the ship staff to assemble the engine immediately after grinding, they used 1.60 MM undersize crankpin bearings.

This facilitated them to immediately operate the Auxiliary Engine after crankshaft repair onsite was executed by RA Power Solutions technicians.

Stock of Yanmar 6N18AL-UV Standard and Undersize Crankpin and Main Journal Bearings

RA Power Solutions with 44 years of experience is very well aware of the difficulty faced by clients in getting the undersized crankpin bearings. We maintain the stock of crankpin bearings up to the undersize of 2.80 MM and have saved a number of crankshafts from rejection.

We have a team of trained technicians available 24/7 hrs and can be deputed on short notice. Some of our technicians also have valid US VISA and can fly to South America, Caribbean countries, etc.

For more information regarding crankshaft grinding services, please contact us at rajshahani@rapowersolutions.com or info@rapowersolutions.com or call us at +91 9582647131 or +91 9810012383.

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The details of the crankshaft of Daihatsu 6DL-16 are as follows:

Inspection Conducted by RA Power Solutions technicians and observations:

• On arrival, the inspection in detail was conducted by our technicians.
• It was informed that a local company based in Dubai was engaged to undertake the repair of two crankpins that were damaged.
• The crankshaft repair company based in Dubai took eight days to repair the two crankpins and the bearings failed twice within engine operation of 10 minutes.
• RA Power Solutions technicians did the dimensional inspection of crankpins. They were surprised to note that the crankpins after grinding by a Dubai-based company had ovality up to 0.12 mm against the maximum permissible limit of 0.03 mm by Daihatsu.
• The readings observed by our technicians before grinding are mentioned below:

                  SIZE OF CR JOURNAL                                     SIZES IN MM

• On further investigation, RA Power Solutions was informed that the company from Dubai had no specialized equipment/ tooling to undertake the grinding of Daihatsu 6DL-16 having a standard diameter of 120 mm and crankpin bearing width of only 64 mm. They did it by hand and were not able to control the ovality.

Action taken by RA Power Solutions Technicians

RA Power Solutions technicians after initial inspection for dimensions, hardness, MPI for crack detection, etc undertook the grinding of crankpins 1 & 4 and undersized both the crankpins by 1.0 mm.

The Final report after grinding is pasted below:

                     SIZE OF CR JOURNAL                           SIZES IN MM

It can be seen from the above readings that the taper & ovality were controlled within 0.02 mm. The engine was commissioned in the presence of our technicians and was operating satisfactorily.

Achievement by RA Power Solutions

The grinding of the crankpin of Daihatsu 6DL-16 needs specially designed, compact onsite crankshaft grinding equipment which RA Power Solutions has developed. This equipment is manufactured in two parts and is inserted from the inspection window of the engine block.

In this case, the crankpin diameter is only 120 mm, and the crankpin bearing width of 64 mm, we have designed the equipment that can undertake grinding/ polishing of the crankpin without removing it from the entablature.

We have been extending our onsite services all over the world for the last forty-three years and regularly work on high RPM engines like Daihatsu, Yanmar, Volvo, MAN B&W,  Caterpillar, Cummins, Deutz Engines, etc.

RA Power Solutions is ISO 9001:2015 (Quality Management System) & ISO 14001:2015 (Environmental Management System) certified approved company.

We have been regularly executing the 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 Repair of the engine and onsite crankshaft replacement, please email us at rajshahani@rapowersolutions.com, or info@rapowersolutions.com, or call us at +91 9582647131 or +91 9810012383.

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We extend crankshaft repair, inspection, and consultancy services all over the world to save the crankshaft from rejection. We have saved thousands of crankshafts which have been rejected by the engine manufacturers. Our technicians have valid seamen books and fly to any destination in the world on short notice.

Advantages of getting repair of crankshaft by RA Power Solutions

• Having executed crankshaft repairs of more than 10, 000, we are the leaders in the world.
• We have the equipment & technical know-how to execute onsite repair of the crankshaft having a small diameter of 35 mm and a large diameter of 700 mm.
• We are the only manufacturer in the world of onsite grinding of crankshaft Equipment and can modify it as per the space available onsite for fitment of the equipment. This is the reason we execute the repairs where others fail.
• Having the latest technology and equipment to undertake onsite grinding of the crankpin and Main Journal having small Bearing width, the most reputed companies based in Singapore, Europe, and other countries do not have equipment available to work on the crankpin and Main Journal having small bearing width.
• They misguide the client to remove the crankshaft from the engine & send it to the workshop for repair.
• All our technicians are trained in-house school and are competent to maintain a close tolerance of diameter within 10-20 microns depending on the requirement of the engine manufacturer.

Save your crankshaft from rejection, contact an expert

• In most cases, the manufacturer rejects the crankshaft by saying that the crankpin has crossed the last limit and the crankshaft has to be rejected.
• RA Power Solutions with 41 years of experience has on record where the grinding and repair of crankpin and Main Journal has been undertaken beyond the last limit of diameter specified by the manufacturer, RA Power arranges the special undersize of bearings.
• We are pasting below a copy of the manual of MAN Diesel Engine Model No. 9L28/32 H crank pin dimensions and undersize allowed.

Manual of MAN Diesel Engine Model No. 9L28/32 H

On going through the specifications one can observe that the crankpin having a standard diameter of 230 mm is even allowed to undersize by 5.0 mm to the size of 225.00 mm. We are pasting below photographs of the crankpin of MAN Diesel Engine Model no 9L28/32 H, which was undersized by us 6.0 mm and is performing satisfactorily.

We have been regularly executing the repairs in Madagascar, Oman, Qatar, Philippines, Bahrain, Srilanka, Bangladesh, Myanmar, Turkey, Nigeria, Greece, Saudi Arabia, UK, Dubai, Malta, Cyprus, Singapore, Malaysia, Colombia, Indonesia, Hong Kong, Spain, Netherlands, Dubai, Portugal, Estonia, Morocco, Belgium, Vietnam, Canada, etc.

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

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A crankshaft is a piece of art manufactured with close tolerances; it needs expert services to successfully execute the repair. We have repaired some crankshafts that the small and inexperienced companies damaged due to lack of know-how and experience. Recently, we have saved the crankshaft of MAN Diesel Engine Model no. CME 5L 16/24 from rejection.

Following are the details:

Crankshaft repair of MAN Diesel Engine Model No. CME 5L 16/24. Crankshaft Grinding Engine Details Table

It was reported by Dubai Dubai-based company that one of their vessel which was sailing near Chittagong port had met with an accident and the crankshaft was damaged. RA Power Solutions. deputed two technicians along with necessary tooling to Chittagong. They boarded the vessel in a short time of 12 hours after receiving the first communication of the breakdown. This was possible as all our technicians have valid Indian CDC.

Following the Inspection of the crankshaft was conducted

• All the crankpins were subject to crack detection by MPI and no crack or abnormality was observed on the crankpin.
• Hardness with a portable calibrated hardness tester was checked and was found within limits.
• The deflection of the crankshaft was within limits.

All the crankpins were checked for taper and ovality out of five crankpins, two number crankpins had the following readings

Ongoing through the above dimensions, owners were surprised as the damage to the crankpins was beyond the last limit stipulated by the engine manufacturer i.e. MAN Diesel for Engine Model no. CME 5L 16/24. In other words as per the manufacturer, there was no solution but to reject the crankshaft and replace it with a new one.

RA Power Solutions took the following action to save the crankshaft from rejection

• Based on the above readings of crankpin no. 2 and crankpin no. 4, it was decided to undersize the crankpin to 1.5 mm and 2 mm from the standard diameter of 130 mm.
• The grinding was undertaken by our technicians and the final diameter of 128.50 and 128.00 mm was maintained.
• The undersized crankpin bearings of 1.5 mm and 2 mm were arranged by RA Power Solutions.
• The MAN Diesel Engine Model no. CME 5L 16/24 was commissioned and the engine is performing satisfactorily.

The under-sizing of the crankpin up to 2 mm is of course done under deviation and against the manufacturer’s recommendation but the fact is that the crankshaft has been successfully repaired and is saved from rejection which helped the owners of the vessel to save a considerable amount and downtime. We at RA Power Solutions always believe in saving the crankshaft from rejection. The cost of the crankshaft is exorbitant and has no justification by the engine and crankshaft manufacturer who enjoy the monopoly.

RA Power Solutions suggests not engaging companies with no expertise and specialized equipment for the repair of the crankshaft. We have the knowledge, experience, and necessary equipment to undertake the repair.

Crankpin Repair Services

We observed that companies avoid crankpin repair due to the time taken to repair of crankpin and the high cost. This was true as few companies based in Europe and Singapore enjoyed the monopoly and charged exorbitantly for crankpin repair. With the introduction of onsite crankpin repair and main journal repair machine, it is now possible to undertake the crankpin and main journal grinding and polishing in minimal time.

Secondly, the cost of crankpin repair charged by RA Power Solutions is almost one-fourth of the charges of European and other companies. In simple language, crankpin repair has become easy with a low cost. For more information about crankshaft grinding services, please email us at rajshahani@rapowersolutions.com, or info@rapowersolutions.com, or call us at +91 9582647131 or +91 9810012383.

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