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

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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.

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