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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The Auxiliary engine number #02 of MAN B&W 5L 16/24 was stopped due to low air pressure, two of our technicians boarded the vessel and inspected the crankshaft. All Five (5) crankpins having a standard diameter of 130.00 MM had ovality ranging from 0.10 MM to 0.40 MM, which is considered to be on the higher side. The crankpins also had bearing line marks, rough surfaces, and localized damage, as the engine was operated in spite of the problem in the crankshaft.

The dimensional Report of crankpins is pasted below:

The hardness and MPI for crack detection was conducted and no abnormality was observed. Technicians started onsite grinding of crankpins were ground ranging from 1.0 MM undersize to 1.50 MM.

The main advantage of onsite crankshaft grinding jobs executed by RA Power Solutions is that the technicians and equipment are trained and designed to execute the job even while sailing of the vessel. There was absolutely no requirement of holding of the vessel. RA Power Solutions also supplied the undersized crankpin bearings for this engine and it was commissioned in a short notice.

RA Power Solutions with experience of more than 44 years extends onsite crankshaft grinding services to leading shipping companies, power plants and heavy industries all over the world.

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 Onsite Crankshaft Grinding Repair of MAN B&W 5L 16/24 appeared first on Crankshaft Grinding Repair.

Crankshaft Failure

• Use of nonstandard lubricating oil or using it for an extended time without changing it.
• Use of bearings beyond the operating hours specified in the maintenance manual of the engine manufacturer.
• Use of substandard lubricating oil filters and using them beyond the specified hours.
• Not maintaining the lubricating oil temperature and oil gap as per the maintenance manual.
• Use of substandard quality bearings.
• Not carrying out the periodical inspection of the crankshaft at the time of undertaking maintenance.
• Non-calibration of crankpin and main journal diameter for taper and ovality.
• Ignoring of crankpin and main journal line marks, pitting, rough surface.
• Increase in deflection readings.
• Non-replacement of connecting rods in case of abnormalities observed.
• Non-calibration of connecting rods big end bore and small end bore.
• Non-inspection of connecting rods, bolts for cracks or distortion, and tightening torque.

As mentioned the crankshaft failure can be caused due to not paying attention to the above.

RA Power Solutions Pvt. Ltd. has been working on the crankshaft of medium and high-capacity engines, 2-stroke and 4-stroke engines for four decades and strongly suggests that all the parameters mentioned in the maintenance manual of the engine manufacturer should be checked. The checks mentioned above are of great importance and we have experienced that most of the crankshaft and engine Get damaged due to ignoring the above points, the user can extend the life of the engine considerably by following the above checks. RA Power Solutions undertakes onsite repair of the crankpin journal and main journal Grinding of the crankshaft.

The following are the main features of crankshaft journal repair

• We undertake crankshaft grinding, and repair of crankshafts having diameters from 35 mm to 700 mm irrespective of the length of the crankshaft.
• The crankshaft repair is undertaken onsite, there is no requirement for the removal of the crankshaft from the engine block.
• All the parameters like taper ovality, and surface finish as mentioned in the maintenance manual are strictly maintained.
• Crankshaft journal repair & Crankshaft journal Grinding are done onsite and by use of the latest crankshaft grinding machine, the repairs are done in minimum time reducing the downtime considerably.
• We can depute technicians on short notice all over the world and our technicians have valid Indian CDC. We also depute our engineers to undertake reinspection of the crankshaft with the calibrated instrument and regrinding of the crank journal if required can be done on the spot.

For more information on crankpin journal repair, grinding of crankshaft main journal, and repair of crankshaft main journal, please email us at rajshahani@rapowersolutions.com, or info@rapowersolutions.com, or call us at +91 9582647131 or +91 9810012383.

The post Crankshaft Failure | Crankshaft Journal Repair | Crankpin Repair appeared first on Crankshaft Grinding Repair.

The main advantage of onsite repairing the damaged shaft or crankpin journal is that it requires very little time to repair and it also works out to be cheaper. In this process of onsite repair, there is no need to remove the shaft from the entablature.

RA Power Solutions extends onsite repair and polishing of any rotary shaft having a diameter from 30 mm to 700mm. Our technicians can fly to any part of the world on short notice as they carry Indian CDC. We are well-known for providing cost-effective and professional Crankshaft Grinding Services all over the world.

Crankpin Journal Grinding & Repair

Crankpin Journal repair has very close tolerances in terms of taper and ovality. This is to be strictly maintained to keep the oil gap between the bearing and crankpin main journal consistent. RA Power Solutions with the latest breed of crankpin journal and main journal grinding machine can maintain the closed tolerance strictly as per the manufacturer’s specification stipulated in the manual.

Don’t Compromise on Crankshaft Grinding Service

Why compromise on the crankshaft grinding services when a world-class company like RA Power Solutions Pvt. Ltd. extends services of crankpin repair all over the world and that too with the lowest cost? Avoid crankshaft from rejection. Contact RA Power Solutions today.

For any queries regarding crankshaft grinding services, portable onsite grinding equipment, crankshaft journals polishing, crankshaft journal grinding, crankshaft grinding main journal, or onsite crankpin journal machining, please email us at rajshahani@rapowersolutions.com, or info@rapowersolutions.com, or call us at +91 9582647131 or +91 9810012383.

The post Onsite Crankshaft Grinding Services From World Leading Company with Guarantee appeared first on Crankshaft Grinding Repair.