RA Power Solutions is the only company in the world that designs and manufactures onsite crankshaft grinding machines ranging from 35 mm to 700 mm in terms of diameter. The design and manufacturing of crankshaft grinding equipment for small diameters and with hands-on expertise, facilities, and experience is done by us. We were recently approached by one of our clients regarding the failure of YANMAR Diesel Engine 6N18AL-DV 450 kva. crankshaft.

The crankshaft’s major details are as follows

As we can see from the above table YANMAR Diesel Engine 6N18AL-DV 450 kva has a crankpin diameter of 145 mm and a bearing width of only 65 mm.

The team of RA Power Solutions technicians was sent on board the vessel which was sailing near the SUEZ canal on-boarding the vessel, the inspection of the crankshaft was conducted, and the following observations were made.

• All the crankpins having a diameter of 145 mm and bearing width of only 65 mm had bearing line marks, pitting, taper, and ovality ranging from 0.16 to 0.28.
• The crankpin hardness and crack detection by MPI were done and no abnormality was observed.
• The deflection readings were observed within limits.
• It was decided to undertake the grinding of all the crankpins to the next undersize of 0.40 mm. All the crankpin diameter was maintained at 144.60 mm.
• The engine was assembled and load trials were taken.

Successful crankshaft grinding and crankshaft polishing of Yanmar diesel engine 6N18AL-DV 450 kva.

The machine manufactured by us is designed to be accommodated on the crankpin diameter and is capable of maintaining the tolerance within 0.02 mm. To our knowledge, none of the crankshaft grinding companies possess compact equipment. For your requirement of grinding of crankshafts of small diameter and bearing width contact RA Power Solutions.

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, about the Yanmar diesel engine and repair of the diesel crankshaft, please email us at rajshahani@rapowersolutions.com, or info@rapowersolutions.com, or call us at +91 9582647131 or +91 9810012383.

The post Onsite Repair of Crankshaft of YANMAR Diesel Engine 6N18AL-DV 450 kva appeared first on Crankshaft Grinding Repair.

Following are the main observations of MAN Diesel Engine

• The crank pin of the engine has a diameter of 130 mm with a bearing width of 56 mm.
• All the crank pins had scoring marks and bearing line marks due to the seizure of the crankpin bearing.
• The dimensional inspection was done and the crank pins had taper and ovality in the range of 0.2 mm to 0.4 mm.
• The hardness was checked and was observed within the limits.
• MPI check was done and few hairline cracks were observed.
• The deflection and runout were observed within the limit.

Action taken by RA Power Solutions

• The grinding of crank pins was undertaken and all the crank pins diameter was maintained within 0.4 mm.
• Crankpin No.3 had deep bearing line marks due to the seizure of the crankpin bearing. The grinding of the crank pin to 0.6 mm was done which is the last size recommended by the engine manufacturer.
• As per the manufacturers since the damage to the crankpin was more than the last limits specified Crankshaft stands rejected and the purchase of a new crankshaft was recommended.
• To save the crankshaft from rejection, RA Power Solutions decided to continue the grinding of the crank pin to the undersize of 1.0 mm under deviation
• The under-size bearing was supplied through one of our associate manufacturers of bearings. The engine was put into operation and has been performing satisfactorily for the last more than nine months.

Expertise available with RA Power Solutions to save the crankshaft from rejection

Having on hand experience of more than forty years, RA Power Solutions has repaired thousands of crankshafts of marine engines and engines installed in power plants which were rejected by the engine manufacturer for the following reasons.

• The damage to the crankpin or main journal was more than the last limit specified by the engine manufacturer.
• Presence of cracks in the crank pin and main journal.
• Observation of higher hardness due to the seizure of bearing.
• Observation of higher runout and deflection.
• RA Power Solutions as the name suggests has the well-tried and tested solution, technology, and equipment available to repair the diesel crankshaft having the above defects.

Don’t reject the crankshaft, reduce the cost of maintenance, and contact RA Power Solutions for a successful repair. Use our technology, equipment, and experienced technicians to save your crankshaft from rejection.

For more information, about MAN Diesel Engine, and diesel engine crankshaft repair, please email us at rajshahani@rapowersolutions.com, or info@rapowersolutions.com, or call us at +91 9582647131 or +91 9810012383.

The post Crankshaft Repair of MAN Diesel Engine having Small Diameter appeared first on Crankshaft Grinding Repair.