Considering the serious damage to the Auxiliary Engine MAN B&W 6L 16/24, a team of three (3) technicians was deputed, which consisted of a Senior Metal Stitching Engineer and Two (2) technicians to repair the crankshaft.

The vessel was boarded by our technicians in Pasir Gudang. Following are the main details of the engine:

Inspection of Crankshaft:

1. All the crankpins were inspected dimensionally, and line marks and ovality were observed on all the crankpins. The standard diameter of crankpin was 130.00 MM.
2. All other parameters, like hardness, and crack detection by MPI, were found within limits.
3. On visual inspection of the radius fillet of two (2) crankpins was found damaged.

Inspection of Engine Block

1. The Engine Block window seating area of Unit number #04 (Port Side) was found badly damaged.
2. The Cam Case was also found broken.

Few Photographs of the damaged Cam Case are given below:

Broken Camshaft Area of the Window	Damaged Window cover Sittting Area

Action Taken by RA Power Solutions to Repair of Crankshaft and Engine Block of MAN B&W 6L 16/24

i. Considering the damage, all six (6) crankpins diameter was reduced from 130.00 Mm to 129.50 MM, maintaining the tolerance of 0.02 MM.

A copy of the report indicating the final dimensions is pasted below:

ii. The broken engine block was repaired by Metal Stitching Process. The new pieces of casting were metal stitched as shown in the photographs.

Initial Cut Given in Engine Block Window Area	Fitment of New Casting in Damaged Area
MAN B&W Model No.6L 16/24 during metal lock	Metal locking of broken area of MAN B&W Model No.6L 16/24

iii) The Undersize bearings were also supplied by RA Power Solutions.

iv) The Engine was commissioned in the presence of our technicians and performance was found satisfactory.

Pasting of Casting by Metal Lock Process	Perfect Matching of Casting After Metal Locking

Cam Cover Area Metal Stitched

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.

For more details of the Damaged Engine Block by Metal Stitching Process, Onboard Crankshaft Repair Services, repair of crankshaft onsite, in situ crankshaft grinding and repair of MAN engine, onsite crankshaft grinding repair services, onsite crankshaft grinding and repair please email us at info@rapowersolutions.com or call +91 9582647131, or +91 9810012383.

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The details are as follows

Inspection of MAN B&W STX 6L 23/30H crankshaft conducted by RA Power Solutions.

• The crank pins were subject to dimensional inspection for taper and ovality.
• The ovality ranging from 0.06 to 0.11 mm was observed on all six crank pins.
• All the crank pins were subject to hardness test and hardness was observed from 219 to 231 on the HB scale which is within the limits.
• All the crankpins were subject to crack detection by high intensity magna flux torch, no cracks or abnormalities were observed.
• The deflection of crankpins was observed within limits.
• On visual inspection, bearing line marks and a rough surface of the crankpin were observed.

Observations made by RA Power Solutions for repair of crankshaft for MAN B&W STX 6L 23/30H

The following action was taken for repair of the crankshaft of MAN B&W STX 6L 23/30H

• All the crankpins were undersized to the first step size of 0.50 mm, and the final diameter of the crankpins was maintained at 184.50 mm after grinding and polishing.
• The crank pins were polished and surface finish was maintained as per the international standards.

Save your crankshaft from rejection, contact RA Power Solutions for the right advice.

With the experience of more than four decades in the field of repair of crankshafts, we have realized that the crankshaft repair companies do not have the facilities to undertake the grinding of crank pins and main journals having small diameters and bearing widths. Their equipment is not designed to sit on the crank pin diameter due to the small bearing width.

Most of the time, these companies either reject the crankshaft for one or another reason otherwise give suggestions to send it to the workshop for repairs. With the advanced technological equipment, experience, and process RA Power Solutions has been successful in undertaking the grinding of crank pins and main journals having small diameters and bearing widths.

The above job was executed in July 2017 and is performing satisfactorily.

We have the pre and final crankshaft inspection reports undertaken on board the vessel duly signed and stamped by the chief engineer. These reports can be shared with clients on request. Take the direct benefit of our expertise and technology. For more information about the Repair of MAN B&W, please email us at rajshahani@rapowersolutions.com, or info@rapowersolutions.com, or call us at +91 9582647131 or +91 9810012383.

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The engine details are as follows

Following are the main observations during the inspection of the Crankshaft of MAN 7L 23/30 Engine

• All the crankpins were subject to dimensional inspection for taper and ovality except crankpin no. 3, the ovality observed on all the crankpins was between 0.16 mm to 0.27 mm. In the case of crankpin no. 3, the ovality observed was 0.66 mm. The hardness of all crankpins was observed between 220 and 230 on the HB scale.
• All the crankpins were subject to crack detection by the MPI method. High intensity, magna flux torch was used for MPI. No crack or abnormality was observed on crankpins except crankpin no. 3 on which multiple hairline cracks/ skin cracks measuring between 50 mm to 75 mm were observed.
• On visual inspection bearing line marks were observed on all the crankpins, crankpin no. 3 had deep bearing line marks.
• No damage on the radius fillet or lubricating oil hole was observed.

Execute repair of the crankshaft of MAN 7L 23/30 H Engine

• All the crankpins except crankpin no. 3 was ground and polished to the undersize of 0.5 mm. In the case of crankpin no. 3, our technicians had no option but to reduce the diameter by 1.5 mm to remove the crack observed during the MPI.
• All the crankpins were polished.
• The crankshaft was fitted with 0.5 mm and 1.5 mm undersize bearings and the engine was put on operation.
• The crankshaft of the MAN 7L 23/30 H Engine is performing satisfactorily.

RA Power Solutions Pvt. Ltd. undertakes onsite repair of crankshafts up to 700 mm in diameter. All our technicians are experienced and have undergone in-house training in our dedicated training school which is equipped with crankshafts of different profiles and diameters. The latest design of in situ crankshaft grinding equipment and the experience of our technicians in crankshaft grinding and polishing results in the maintenance of close tolerance within 10/20 microns and achievement of surface finish of less than 20 Ra value which is far better than international standards.

This blog is written by Mr. Raj Shahani (Managing Director of RA Power Solutions). He has more than forty years of experience in the field of engine repair and is a technical adviser to various shipping and heavy industries based all over the world.

For more information on crankshaft repair equipment, crankshaft repair equipment, please email us at rajshahani@rapowersolutions.com, or info@rapowersolutions.com, or call us at +91 9582647131 or +91 9810012383.

The post crankshaft repair equipment of MAN 7L 23/30 H Engine on Board a Vessel appeared first on Crankshaft Grinding Repair.

Due to the non-availability of tooling with the leading crankshaft engine repair companies, they generally advise removing the crankshaft from the engine block and sending it to the workshop for grinding and polishing purposes. We have observed in some cases even advice for replacement of the crankshaft is also given. This suggestion works out to be very expensive and time-consuming, especially in this time of recession.

Compact onsite crankshaft grinding machine designed by RA Power Solutions

RA Power Solutions Pvt. Ltd. Is the only company in the world that designs and manufactures its crankshaft grinding machines in technical collaboration with a leading Italian company.

The grinding machine manufactured by us can easily grind onsite even with a small diameter of 35 mm and a bearing width of 25 mm. This is a technological revolution and advancement done by RA Power Solutions engineers out of their experience, knowledge, and passion to do something new and different.

It’s our business to undertake regular grinding and polishing of crankshafts all over the world. We are sharing below details of a few engine crankshafts that got damaged and were successfully repaired by us. On going through the crankpin diameter and crankpin bearing width, one will observe that they are quite small.

The crankshaft grinding machine manufactured by us is used by our technicians who are trained in our in-house training school. For your requirement of onsite repair of a crankshaft up to 700 mm in terms of diameter, contact RA Power Solutions.

About Blog Author

This blog is written by Mr. Raj Shahani (Managing Director of RA Power Solutions). He has more than forty years of experience in the field of engine repair and is a technical adviser to various shipping and heavy industries based all over the world. For more information, please email us at rajshahani@rapowersolutions.com, or info@rapowersolutions.com, or call us at +91 9582647131 or +91 9810012383.

The post Crankshaft Engine Repair | Small Diameter and Bearing Width appeared first on Crankshaft Grinding Repair.