The major technical details of the crankshaft are given below:

• On going through the above major technical details of the crankshaft it can be seen that the crankpin width is as small as 71 mm and it is difficult for the onsite crankshaft grinding machine to be placed on the crankpin diameter for machining.
• RA Power Solutions has designed a dedicated tooling to undertake grinding of the MAK 8M20 crankpin having a bearing width of only 71 mm.
• Our team of two technicians inspected the crankpin and observed the ovality of 0.56 mm. The readings are posted below.

• All the parameters like hardness, MPI, and deflection were observed within limits.
• Grinding with a portable crankshaft grinding machine was undertaken. The diameter of 152.00 mm was reduced to 151.00 (1.0 mm undersize).
• Final readings after crankpin machining/crankpin grinding are pasted below:

• The undersize bearing was supplied by RA Power and the engine was successfully put back in operation within 15 hrs of boarding the vessel by our technicians.

For the specific engine and their model crankshaft repair, you may visit our blogs on the website RA Power Solutions or write to us to share the reports of various complicated repairs of crankshaft executed by us. RA Power Solutions is ISO 9001:2015 (Quality Management System) & ISO 14001:2015 (Environmental Management System) certified approved company.

We have been regularly executing on-site crankshaft repairs and crankshaft grinding in Dubai, Oman, Saudi Arabia, Qatar, Abu Dhabi, Sharjah, Ajman, Umm Al-Quwain, and Fujairah, Bahrain, Kuwait, Iraq, Antigua and Barbuda, Belize, Dominica, Dominican Republic, Grenada, Guyana, Haiti, Jamaica, Saint Kitts and Nevis, Saint Lucia, Saint Vincent and the Grenadines, Trinidad, and Tobago, etc.

For more details on the Repair of the engine and supply of bearings and crankshaft machining polishing please email us at rajshahani@rapowersolutions.com, or info@rapowersolutions.com, or call us at +91 9582647131 or +91 9810012383.

The post Crankshaft Machining and grinding of MAK 8M20 appeared first on Crankshaft Grinding Repair.

On crankshaft inspection after the accident, we have observed following

Observation of crankpin and main journal of crankshaft after bearing failure

• Due to failure of crank pin or main journal bearings, on visual inspection the crankpin and main journal diameter develops line marks, pitting, and rough surface.
• In case after failure of crank pin, the main journal bearing, the engine is not stopped on time, and the radius fillet of both sides gets damaged. In some cases, we have noticed that the lubricating oil hole profile also gets lost.
• In most of cases, bearing failure results in the sticking of bearing material on the crankshaft surface. The main reason is that the bearing steel shell rubs with the crankpin and main journal diameter, temperature abnormally increases due to friction, and bearing material melts.
• Overheating due to failure of bearing shell on the crankshaft also results in black/ blue discoloration.
• The hardness increases due to abnormal heating.
• Cracks on crank pin and main journal in some of the cases are also observed.
• In case the accident is serious, it can also cause the loss of alignment of the crankshaft which becomes a serious issue for onsite repair.
• In case of above observation, certainly it is not possible to assemble the new bearings and operate the engine.
• The crankpin and main journal of the crankshaft after thorough examination requires grinding.
• We have observed that in some cases ship owners and maintenance engineers try to do the polishing of crankpin and main journal by hand which results in the repetitive failure of bearing and crankshaft.
• As a repair company with forty years of experience, we have observed that generally the crank pin and main journal diameter has to be maintained between 0.03 and 0.05 mm which is impossible to maintain by hand.
• Hence, RA Power Solutions does not recommend polishing the crankshaft by hand.

Specialization of RA Power Solutions in Crankshaft Machining and Polishing on Site

RA Power Solutions specializes in repair of crankshaft onsite without removing it from the engine block. Our technicians with onsite portable crankshaft machining equipment visit your plant or board the vessel all over the world to undertake the repairs.

With more than 10, 000 crankshaft repair jobs undertaken by us, our success rate of repair of seriously damaged crankshaft is almost 100%. We agree that there are cases where due to failure of bearing, generation of abnormal heat, multiple cracks are developed or the taper and ovality developed after the accident are higher than the last limits specified by the manufacturer. In that case there is no point in attending to the repairs.

Following steps are taken for successful repair of crankshafts of main and auxiliary engines

We give great importance to the pre-inspection of the damaged crankshaft. This is done by our experienced technicians using the state of art measuring instruments which are calibrated and certified by the agency of repute.

Pre-inspection includes the following

• Dimensional inspection of crankpin and main journal.
• Checking deflection/run-out to know the loss of alignment of crankshaft if any.
• Checking of hardness.
• Crack detection by MPI, Dye–penetrant test.
• Visual inspection
• The pre-inspection report of crankshaft is thoroughly studied by our technicians on site and strategy and successful repair is planned.
• The grinding of crankpin and main journal is undertaken removing the minimum stock possible. This helps in enhancing the life of the crankshaft.
• The removal of minimum stock from crank pin and main journal is possible only because of the use of the latest generation of onsite crankshaft grinding machine by us.
• The final inspection is undertaken and reports are prepared.

RA Power Solutions regularly undertake on site grinding of crankshaft, rotating shafts, alternator shafts, rotor shafts, turbine shafts, electric motor shafts, crankshaft machining and polishing.

We provide crankshaft grinding services in countries like Australia, Bangladesh, Cambodia, Chinese Mainland, Hong Kong, Indonesia, Japan, Malaysia, Maldives, Myanmar, New Caledonia, New Zealand, Philippines, Singapore, South Korea, Sri Lanka, Thailand, Vietnam, Afghanistan, Bahrain, Iraq, Israel, Jordan, Kuwait, Lebanon, Oman, Qatar, Saudi Arabia, Syria, United Arab Emirates, Yemen, etc.

For more information, in place crankshaft machining and polishing, polishing crankshaft please email us at rajshahani@rapowersolutions.com, or info@rapowersolutions.com, or call us at +91 9582647131 or +91 9810012383.

The post Crankshaft Machining and Polishing | Insitu Cutting of Crankpin | RA Power Solutions appeared first on Crankshaft Grinding Repair.