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.

Crack Detection Test of Wartsila VASA Engine Model 12V32LN By MPI	Hardness Test of Wartsila VASA Engine Model 12V32LN

Main observations of the crankshaft of Wartsila Vasa are :

(I) On a visual inspection of crankpin number one, having a standard diameter of 270 mm, it was found to be damaged with deep line marks, pitting, and a rough surface.

(II) The crankpin was subjected to dimensional inspection after cleaning the embedded bearing material. The following measurements were observed for Crankpin Number One:

Minimum Diameter: 269.45 mm

Maximum Diameter: 269.89 mm

Ovality Observed: 0.55 mm

(III) All other crankpins were visually inspected, and no damage or marks were observed.

(IV) As per standard procedure, Crankpin Number One was subjected to a crack detection test using the MPI process, and hardness testing was also carried out. No abnormalities were observed

(V) Crankpin Number One was undersized by on site crankshaft grinding equipment. The diameter was reduced by 1 mm to control ovality and to remove the line marks observed after the bearing seizure. The final crankpin diameter was maintained as 269.00 – 0.02 mm.

Assembly of Crankshaft Grinding Machine on Damaged Crankpin	Onsite Grinding Under Process

RA Power Solutions, during its long-standing presence in the industry, has executed repair of over 1300 Wartsila engine crankshafts of various models. The most popular models serviced include WARTSILA 12V32 and WARTSILA 18V32, widely installed in diesel power plants around the world.

At RA Power Solutions, we specialize in on site crankshaft grinding for Wartsila, Yanmar, MAN, and MAK engines, offering a reliable and cost-effective solution to repair damaged or worn crankshafts without removing them from the engine.

This advanced service not only eliminates the need for engine disassembly and costly transportation but also significantly reduces downtime. Using state-of-the-art portable grinding equipment, our expert technicians restore the crankshaft’s dimensions and surface finish to OEM standards, ensuring optimum engine performance.

Wartsila VASA Engine Model 12V32LN Grinding Under Process	Crankpin Inspection Under Progress Before Polishing

With over four decades of experience, we’ve successfully delivered onsite crankshaft grinding services across the globe—including Burkina Faso, Bangladesh, Dubai, Indonesia, Singapore, and many other ports and shipyards worldwide. No matter where your vessel or power plant is located, RA Power Solutions is ready to respond with precision, speed, and expertise.

Get in touch with us today for expert services in onsite crankshaft repair, crankpin polishing, crankshaft reconditioning, and in-situ crankshaft grinding. Our team is equipped to provide fast and reliable solutions, wherever your engine is located. For inquiries or service requests, please email us at rajshahani@rapowersolutions.com or info@rapowersolutions.com, or call us at +91 9582647131 / +91 9810012383. We’re here to support you—anytime, anywhere.

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