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.

The post MAN 7L23/30H Crankshaft Repair at Khor Al Zubair Port, Iraq appeared first on Crankshaft Grinding Repair.

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.

The post Repair of DEUTZ SBV 12M 628 Crankshaft In Trinidad and Tobago appeared first on Crankshaft Grinding Repair.

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.

The post Daihatsu 6DKM-36 Crankshaft Repair In Johor Bahru, Malaysia appeared first on Crankshaft Grinding Repair.

The non-operation of two auxiliary engines stranded the vessel. Considering the urgency of the situation, RA Power Solutions deputed two technicians along with a specially designed onsite crankshaft grinding machine capable of grinding crankpins with small diameters and narrow widths.

In the case of the MAK 6M20 auxiliary engine, the standard diameter of the crankpin is only 152.00 mm, with a bearing width of 71 mm. The design of our onsite crankshaft grinding machine is such that it can be mounted on the crankpin diameter through the inspection window, and grinding is executed in situ.

The details of the engine are as follows:

Upon arrival on board the vessel, our technicians conducted an initial inspection of all crankpins. They found excessive ovality in all six crankpins of the MAK 6M20 engine.

We have provided a copy of the preliminary dimensional inspection report below.

All other parameters, including hardness, MPI, and deflection, were within acceptable limits. We jointly decided to grind all the crankpins, and RA Power Solutions machined them to a final size of 151.00 mm (1.00 mm undersize) as per the above dimensions.

During the stay of our technicians on board the vessel, the crankshaft of Auxiliary Engine #02 was also inspected. We detected excessive ovality showing the same pattern observed in the crankshaft of Auxiliary Engine 01.

The preliminary dimensional inspection report is provided below:

SIZE OF CR Pins Before Grinding of A/E 02
	A	Aa	C	Cc	B	Bb	Min	STD	Ovality
CR-1	151.73	151.85	151.74	151.84	151.75	151.82	151.73	152.00	0.27 MM
CR-2	151.73	151.85	151.72	151.83	151.70	151.81	151.7	152.00	0.30 MM
CR-3	151.72	151.85	151.71	151.84	151.69	151.83	151.69	152.00	0.31 MM
CR-4	151.75	151.85	151.72	151.84	151.73	151.86	151.72	152.00	0.28 MM
CR-5	151.73	151.84	151.69	151.82	151.70	151.84	151.69	152.00	0.31 MM
CR-6	151.73	151.92	151.72	151.89	151.75	151.84	151.72	152.00	0.28 MM

Our technicians ground this crankshaft and maintained the following dimensions. They successfully commissioned both engines in their presence.

SIZE OF CR Pins After Grinding A/E 02
	A	Aa	C	Cc	B	Bb	Min	Max	Ovality
CR-1	151.00	150.99	150.99	150.98	150.99	151	150.98	151.00	0.02 MM
CR-2	151.00	150.99	150.99	150.98	151.00	150.98	150.98	151.00 0.02 MM	0.02 MM
CR-3	151.00	150.99	150.98	150.98	150.99	151.00	150.98	151.00	0.02 MM
CR-4	151.00	150.99	150.98	150.99	150.99	151.00	150.98	151.00	0.02 MM
CR-5	151.00	150.99	150.98	150.98	150.99	151.00	150.98	151.00	0.02 MM
CR-6	151.00	150.99	150.98	150.98	150.99	151.00	150.98	151.00	0.02 MM

The post MAK 6M20 Crankshaft Repair in Baku, Azerbaijan appeared first on Crankshaft Grinding Repair.

Caterpillar G3616 Crankshaft

The Caterpillar G3616 gas engine met with an accident and, upon preliminary inspection, was found to be damaged.

RA Power Solutions’ technicians arrived at the site near Tehran and inspected the crankshaft of the Caterpillar G3616. The following are the main observations:

(i) The crankpin bearing of Number #03 was severely stuck to the crankpin surface. The top layer of the bearing had melted and become embedded in the crankpin diameter.

(ii) The bearing material embedded in the crankpin surface was removed to facilitate inspection for hardness, presence of cracks, and dimensional accuracy.

(iii) The minimum and maximum crankpin diameters observed are as follows:

(a) Minimum diameter: 214.93 mm

(b) Maximum diameter: 216.00 mm

Against the standard diameter of 216.00 mm, an ovality of 1.07 mm was observed

(iv) Minor surface cracks were also observed during the MPI (Magnetic Particle Inspection).

(v) Hardness was found to be within acceptable limits, except at a few spots.

Saving of Caterpillar G3616 Crankshaft From Rejection

Based on the fact that the ovality in crankpin number #03 was observed to be 1.07 mm, an inquiry was sent to the manufacturer. The manufacturer informed us that the maximum allowable undersize for the crankpin is 1.00 mm, meaning the minimum acceptable diameter must be 215.00 mm. In this case, since the damage had already reached 1.07 mm, the crankshaft is considered rejected, as per the manufacturer’s guidelines. In this case, the expected undersize after grinding was 2.00 mm, which is beyond the permissible limit.

RA Power Solutions has undertaken onsite grinding of Crankpin Number #03, reducing its size by 2.00 mm, and the following dimensions were maintained after grinding:

a) Minimum diameter observed: 213.98 mm

b) Maximum diameter observed: 214.00 mm

RA Power Solutions, a company providing services for the past 45 years, arranged a 2.00 mm undersized bearing for the Caterpillar G3616 crankshaft through a leading manufacturer based in Germany.

The engine has been assembled and is performing satisfactorily.

We have been regularly executing the on site crankshaft repairs and crankshaft grinding of different engines, like Caterpillar, Wartsila, Cummins, Yanmar, Daihatsu and MAN and MAK in Iran, Iraq, 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 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.

The post Caterpillar G3616 Crankshaft Repair in Tehran, Iran appeared first on Crankshaft Grinding Repair.

Efficient Repairs, Delivered On Site

On site crankshaft repair eliminates the need to dismantle and ship large engine components. Instead, skilled technicians bring precision tools and advanced equipment directly to your location. Whether on a vessel at sea, an offshore platform, or a remote industrial plant, repairs are carried out in situ with the same accuracy as workshop-based service. This significantly reduces engine downtime and associated logistics costs.

Common crankshaft issues such as journal wear, scoring, taper, ovality, cracks, or bearing damage can now be rectified on site. By machining and grinding crankpins or main journals without removing the crankshaft, repairs can be completed in a fraction of the time. The portable equipment used is engineered to deliver high-precision results, often within tolerances of a few microns. Once the machining is done, final checks like hardness testing, alignment inspection, and surface finish measurement ensure the crankshaft is restored to OEM standards.

Why Choose RA Power Solutions for On Site Crankshaft Repair?

RA Power Solutions is a well-known name in the field of in situ engine repairs, with decades of expertise providing high-quality crankshaft services globally. To achieve consistent, long-lasting results, our expert specialists use cutting-edge equipment and strictly adhere to quality control protocols. We specialize in doing on site crankshaft repair swiftly and efficiently, saving downtime while keeping high-quality standards.

This approach not only saves time and money but also extends the life of engine components. It reduces the need for expensive replacements. RA Power Solutions is committed to helping clients operate without disruption. Whether it’s for a commercial ship, power plant, or critical industrial machinery.

If your engine is showing signs of crankshaft damage—such as unusual noise, vibration, or performance loss—don’t wait. We offer immediate response and tailored repair services across the globe. Trust RA Power Solutions to bring world-class service to your site.

For more details of the On Site Crankshaft Repair, Crankshaft Grinding Services, In Situ Crankshaft Grinding, or email us at info@rapowersolutions.com, Call at +91-9582647131,+91 9810012383.

The post On Site Crankshaft Repair – A Smarter Solution for Engine Maintenance appeared first on Crankshaft Grinding Repair.