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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RA Power Solutions was approached and deputed our two technicians along with onsite crankshaft grinding equipment. The vessel was anchored at MIP Mersin, Turkey.

Following are the major Engine and Crankpin details:

HIMSEN HYUNDAI 6H 17/28 CR Pin Having Hairline Crack

Main Observations of Crankshaft of HIMSEN HYUNDAI 6H 17/28

i) On visual inspection, it was found that it was a case of lubricating oil pump failure, damaging the bearings of all connecting rods.

ii) The bearing material was found embedded on all six (6) crankpins and was carefully removed. After polishing the crankpins, the dimensional inspection was conducted. The taper, ovality ranging from 0.22 MM to 0.86 was observed.

CR Pin Hardness Inspection	CR Pin of HIMSEN HYUNDAI 6H 17/28 Before Repair

The Dimensional Inspection Report of Six (6) Number Crankpins of HIMSEN HYUNDAI 6H 17/28:

iii) The hardness was checked and was found within limits, except for a few spots, which were found not harmful to the crankshaft.

iv) The crankpins were subject to a MPI test for crack detection and minor hairline cracks were observed, All other parameters were found within the limit.

Crank Pin Before Repair	HIMSEN HYUNDAI 6H 17/28 After Grinding And Polishing

Action Taken By RA Power Solutions Technicians For Damaged Crankpins:

i) The grinding of all six (6) crankpins was undertaken by our insitu crankshaft grinding machine.

ii) Three (3) number of crankpins diameter was reduced by 1.00 MM and the final size was maintained as 174.00 MM.

iii) Three (3) number of crankpins diameter was reduced by 1.50 MM and the final size was maintained at 173.50 MM.

Final Report After Grinding is Pasted Below:

The tolerance of all six (6) number crankpins was maintained with 0.02 MM.

We have been regularly executing on site crankshaft repairs and In Situ crankshaft grinding in Dubai, Fujairah, Qatar, Saudi Arabia, Oman, Iraq, Togo, Malta, Freetown, Egypt, Malaysia, Iran, Indonesia, Vietnam, Jordan, etc.

We have a team of trained technicians available 24/7 and can be deputed at 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, onsite insitu crankshaft repair, crankshaft grinding and repair, grinding of onsite crankshaft repair, insitu crankshaft grinding repair, grinding of crankshaft onsite please contact us at rajshahani@rapowersolutions.com or info@rapowersolutions.com or call us at +91 9582647131 or +91 9810012383.

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