The MAN 7L23/30H engine crankshaft of a vessel at Khor Al Zubair Port, Iraq, was reported damaged. RA Power Solutions has repaired a number of crankshafts of MAN 7L23/30H engines during the last 46 years of extending services all over the world. With our experience and based on the initial reports of damage shared by the vessel, we planned the strategy for the repair of the MAN 7L23/30H engine at Khor Al Zubair Port, Iraq.

The tooling was prepared, and two technicians having a valid seaman’s book flew to Khor Al Zubair Port, Iraq, with an onsite crankshaft grinding machine. The technicians also carried undersized crankpin bearings with them in order to facilitate the immediate commissioning of the engine after the necessary repairs were executed.

Damaged Crankpin Journal of MAN 7L23/30H Auxiliary Engine

Damaged Crankpin of MAN 7L23/30H Auxiliary Engine

Engine Details of the MAN 7L23/30H

Crankshaft Inspection by MPI – MAN 7L23/30H Auxiliary Engine

Crack Detection Using MPI – MAN 7L23/30H Auxiliary Engine

Observation and Repair of the Crankshaft of MAN 7L23/30H at Khor Al Zubair Port, Iraq

i) On visual inspection, two crankpins, Nos. 4 and 6, were observed to be damaged. Crankpin bearing material was found in the oil sump of the entablature.
ii) Crankpins Nos. 4 and 6 were inspected for taper and ovality, and the following readings were observed.

iii) Other parameters, such as hardness and crack detection tests by MPI, were carried out, and no abnormalities were observed.

iv) It was jointly decided, in consultation with the owners, to undertake the grinding in steps of 0.5 mm onwards, as per the manufacturer’s guidelines.

v) After the grinding operation, both crankpins No. 4 and No. 6 were undersized by 1.50 mm, and all parameters were maintained as per the manufacturer’s specifications and recommendations.

Onsite crankshaft machining in process for MAN 7L23/30H Auxiliary Engine

Final Dimensions After Repair

Availability of Undersized Bearings for MAN 7L23/30H

RA Power Solutions technicians carried the undersized crankpin bearings to Khor Al Zubair Port, Iraq, and the engine was assembled and commissioned in their presence. RA Power Solutions maintains undersized bearings for popular engine makes to facilitate clients.
For all repairs, including the above crankshaft of MAN 7L23/30H, we provide records of the inspection report before and after the repair of the crankshaft. These reports are signed and stamped by the Chief Engineer of the vessel. On request, we can share these reports with our clients.

This case once again highlights RA Power Solutions’ proven capability to execute critical crankshaft repairs worldwide with high precision, strong technical expertise, and extensive field experience, ensuring reliable and timely solutions for marine and industrial engines.

For more information on onsite crankshaft repair, grinding of crankshaft, and crankshaft polishing, 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 details of the DEUTZ SBV 12M 628 are as follows: –

Crankpin Wear and Scoring Marks on Crankshaft of DUETZ SBV 12M 628 Engine	Damaged Crankpin of DUETZ SBV 12M 628 Engine

MPI Testing on Crankpin of DUETZ SBV 12M 628 Engine	Crankshaft Inspection by MPI – DUETZ SBV 12M 628

Inspection and Repair of DEUTZ SBV 12M 628

After inspection of all the crankpins, it was decided to grind crankpin numbers 02 and 04, and balance crankpin numbers 01, 03, 05, and 06, which were polished.

The following final dimensions were maintained:

The undersized bearings have been arranged by the client, and the engine has been commissioned.

Smooth Crankpin Finish After Grinding and Polishing – DUETZ SBV 12M 628	Final Surface Finish of DUETZ SBV 12M 628 Crankshaft

The above repair work on the DEUTZ SBV 12M 628 crankshaft was carried out successfully without removing the crankshaft from the engine. Precision grinding and polishing ensured that all crankpins were brought within acceptable limits with minimum ovality and proper surface finish. Following assembly with undersized bearings supplied by the client, the engine was commissioned successfully and is running satisfactorily.

For more information on onsite crankshaft repair, grinding of crankshaft, and crankshaft polishing, 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 crankshaft details of the Daihatsu 6DKM-36 are as follows:

Damaged Crankpin of Daihatsu 6DKM-36 Engine	Crankpin Wear and Scoring Marks on Crankshaft of Daihatsu 6DKM-36 Engine
MPI Testing on Crankpin of Daihatsu 6DKM-36 Engine	Non-Destructive MPI Testing of Crankpin – Daihatsu 6DKM-36 Engine

Observation of The Crankshaft of Daihatsu 6DKM-36

i) On visual inspection, it was noted that the bearing of crankpin number 03 was damaged, and bearing material was accumulated in the sump.

ii) On opening the connecting rod, the bearing was found to be badly damaged. Crankpin number 03 was also embedded with bearing material.

iii) The bearing material was removed, and crankpin number 03 was inspected for dimensions (taper & ovality).

The following minimum and maximum dimensions were noted:

iv) Due to high temperature and rubbing of the bearing on the crankpin, multiple scoring marks were observed.

Action Taken by RA Power Solutions for the Successful Repair of Daihatsu 6DKM-36 Crankshaft

The grinding of crankpin number 03 was started with an onsite crankshaft grinding machine. Initially, considering the ovality, it was estimated that the crankpin was to be undersized by 0.5 mm. However, on evaluation, it was decided to reduce the diameter of the crankpin further by 0.5 mm. The undersize of 1.00 mm was maintained.

The readings observed after grinding are pasted below:-

The ovality was maintained within 0.02 mm.

Smooth Crankpin Finish After Grinding and Polishing – Daihatsu 6DKM-36	Crankshaft Grinding and Repair of Daihatsu 6DKM-36 Engine

RA Power Solutions has been extending crankshaft repair services all over the world for 46 years of experience. We have successfully repaired and saved ten thousand (10000) crankshafts from rejection by using our experience. A few crankshafts have been repaired by us under deviation with the presence of cracks or undersizing beyond the last limit prescribed by the manufacturer.

For all repairs, including the above crankshaft of Daihatsu 6DKM-36, we provide records of the inspection report before and after the repair of the crankshaft. These reports are signed and stamped by the Chief Engineer of the vessel. On request, we can share these reports with our clients.

This case once again demonstrates RA Power Solutions’ capability to undertake critical crankshaft repairs worldwide with high accuracy, technical expertise, and proven field experience.

For more information on onsite crankshaft repair, grinding of crankshaft, and crankshaft polishing, 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 Rolls-Royce (Bergen B32:40L8P) is installed on a vessel as the main engine. The vessel was at the outer anchorage of Mumbai Port.

The details of the crankshaft and engine are as follows:

Our two (2) technicians with onsite crankshaft grinding machine and measuring equipment boarded the vessel at short notice. A detailed inspection was undertaken, and crankpin number #06 was found damaged.

The main observations of crankpin number #06 of Rolls-Royce (Bergen B32:40L8P) are as follows:

i) Minimum Diameter of Crankpin Number #06 – 268.57 MM
ii) Maximum Diameter of Crankpin Number #06 – 270.00 MM
Ovality—1.43 MM

In the MPI test, hairline cracks were also observed. RA Power Solutions technicians executed the repairs by grinding the crankpin number #06 undersized by 2.00 mm. The bearing was available onboard the vessel, and the engine was commissioned in a very short time.

RA Power Solutions offers on-site crankshaft grinding and repair services under a wide range of conditions, whether on a vessel at sea or at a power plant/cement plant in a remote location. All crankshaft grinding services provided by RA Power Solutions are guaranteed to ensure the crankshaft and diesel engine perform satisfactorily after repairs.

RA Power Solutions has always committed itself to delivering excellent and timely service. With over 46 years of experience, we have successfully repaired more than 10,000 crankshafts worldwide.

Crankpin Bearings In Stock For Rolls-Royce Bergen B32:40L8P Engine

RA Power Solutions has a ready stock of crankpin bearings for the Rolls-Royce Bergen B32:40L8P engine to meet urgent replacement requirements during on-site crankshaft repair and grinding. Standard and undersized crankpin bearings are available for immediate dispatch to assist vessel owners and operators in minimising downtime and getting the engine back to full power as soon as possible. Our crankshaft grinding expertise, combined with authentic crankpin bearings, means faster repair execution and complete compliance with OEM specifications after crankshaft restoration.

For more information on onsite crankshaft repair, crankshaft grinding, and crankshaft polishing, 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 standard diameter of the crankpin is only 152.00 mm, and the bearing width is 75.00 mm.

The details are as follows:

The damaged crankpin was calibrated, and excessive ovality was observed. All other parameters were found to be within limits. RA Power Solutions successfully executed the grinding and polishing of the crankpin using a portable onsite crankshaft grinding machine without removing the crankshaft from the engine block. Despite the complicated and limited inspection window opening, the repair was successfully completed; consequently, the crankpin was undersized by 2.00 mm to effectively correct the high ovality and restore proper geometry.

Onsite Crankshaft Grinding Services with Global Reach and Proven Performance

RA Power Solutions offers onsite crankshaft grinding and repair services under a wide range of conditions; whether operating on a ship at sea, at a power plant, or even at a cement plant in a remote location, the company ensures reliable and efficient solutions. As a result, this global reach ensures a quick response and, furthermore, delivers reliable solutions anywhere.Despite the complicated and limited inspection window opening, our technicians successfully completed the repair; consequently, they undersized the crankpin by 2.00 mm to effectively correct the high ovality and restore proper geometry. Furthermore, RA Power Solutions guarantees that its crankshaft grinding services ensure satisfactory performance of the crankshaft and diesel engine after repairs.

Global Expertise in Locomotive Engine Crankshaft Repair Services

With the ability to deploy skilled technicians worldwide, crankshaft repair services are available across multiple industries, including railways, marine, and power plants. As a result, this global reach ensures a quick response and, furthermore, delivers reliable solutions anywhere.

Moreover, our advanced in-situ crankshaft grinding offers significant advantages, including reduced repair time, substantial cost savings, and the complete elimination of engine removal. As a result, this technique enables efficient onsite repairs while consistently maintaining OEM standards.

For more information on onsite crankshaft repair, grinding of crankshaft, and crankshaft polishing, 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 crankshaft details of the MAN B&W 5L 16/24 are as follows:

In the case of the MAN B&W 5L 16/24 crankshaft, the crankpin diameter is relatively small at 130.00 mm, with a bearing width of only 56.00 mm. To facilitate onsite crankshaft grinding of the crankpin, RA Power Solutions has designed and developed a dedicated onsite crankshaft grinding machine. This machine can be inserted through the inspection window, allowing grinding to be carried out efficiently.

RA Power Solutions deputed technicians, along with equipment, and the following actions were taken:

i) Excessive ovality of 0.97 mm was observed on crankpin No. 03 of the auxiliary engine. Line marks were also noted.
ii) All other parameters, such as hardness, MPI (for crack detection), and visual inspection, were checked and found to be within limits.

iii) Grinding of crankpin No. 03 was carried out, and the diameter was maintained at 128.50 mm (undersized by 1.50 mm).

Advantages of Engaging RA Power Solutions for Repair of Crankshaft – MAN B&W 5L 16/24

i) As a designer and manufacturer of onsite crankshaft grinding machines, we undertake modifications to the equipment, if required, to ensure the successful repair of the crankshaft.

ii) In this case, since the crankpin diameter is only 130.00 mm and the bearing width is 56.00 mm, we developed equipment capable of both grinding and polishing.

iii) We maintain a stock of bearings for popular engine makes and models, including undersized and special sizes. In this case, the required bearings were carried by our technicians, and the engine was commissioned immediately after the crankshaft repair.

Availability of Undersized Crankpin Bearings in Stock of MAN B&W Engine Model No. 5L 16/24

RA Power Solutions has consistently dedicated itself to delivering exceptional and prompt service. With over 46 years of experience, we have successfully repaired more than 10,000 crankshafts worldwide.

We have been regularly providing our services in South Africa, Nigeria, Cambodia, Tanzania, Brazil, Canada, Australia, Bangladesh, Greece, Haiti, Hong Kong, Indonesia, Kenya, Malaysia, Maldives, Kenya, Kuwait, Madagascar, Mexico, Nigeria, Oman, Philippines, Saint Lucia, Saudi Arabia, Singapore, Spain, Sint Maarten, Sri Lanka, Suriname, Thailand, Togo, United Kingdom, United States, Yemen, Zambia, 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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