MAN 9 ASL 25/30 Crankshaft Repair/in situ Crankshaft Grinding RA Power Solutions

by RAPower Solutions RA Power

RA Power Solutions was informed by one of our client regarding failure of Crankpin no. 6 of AE#2 of MAN 9 ASL 25/30 Model Engine. 


The Engine details are as following:




 Crankshaft Details



 Engine Make



Engine Model

9 ASL 25/30


Crank pin Diameter Standard

195 mm


Crankpin Bearing Width

77 mm


Our technicians boarded the vessel at Mumbai port and performed an evaluation of the crankshaft. 


Following were the main observations:


Inspection & observation of MAN 9 ASL 25/30 crankshaft of engine no. 2 crank pin no. 6:


i) During the visual inspection of crankpin  it was observed that the crank pin bearing got melted and was badly embadded on the crankpin. 


ii) The crankpin bearing was removed and was found badly damaged. It was a serious accident as the bearing was burnt which shows that temperature exceeded 600°/700° celsius. 


iii) The crank pin was polished and dimensional inspection was conducted. During the dimensional inspection the ovality of 0.66 mm was observed.   


iv) The radius fillet of both the sides was badly damaged. 


v) The crack detection by MPI and high intensity magnaflux torch was conducted by our qualified technician showed the multiple cracks, length ranging from 5 mm to 19 mm.


vi) The hardness was found on a higher side.


Action taken by RA Power Solutions technicians to repair crank pin of MAN 9 ASL 25/30  


i) The crankpin bearing width 77 mm only made the execution of the job very complicated.


ii) We used a specially designed onsite crankshaft grinding tool to be accommodated on the crankpin. 


iii) We could undertake the grinding of crankpin with damaged radius because of the use of the latest technology of crankshaft grinding equipment developed and manufactured by us.  


iv) Initially the grinding was done to undersize 0.5 mm and crank pin diameter was maintained 194.50 mm. On undertaking the MPI test the multiple cracks were still present on a critical location near the radius fillet. 


v) The grinding of crankpin was again resumed and crack detection by MPI method was undertaken at different stages.  


vi) Finally the crankpin diameter was reduced to 193.5 mm as all the cracks got removed.


vii) The engine was assembled, oil gap was checked and everything was obseved within limits. Engine  was commissioned.   


 MAN 9 ASL 25/30 Repair of crankpin with damaged radius fillet


In spite of damage of  the radius fillet of both the sides of the crank pin of MAN 9 ASL 25/30, it was possible for RA Power to successfully repair the crankpin. 


The use of latest design and modern equipment helps us in executing the repair of crankpin &  main journal radius fillet of which is damaged.Most of the companies cannot undertake such repair. 


We have been regularly executing the on site crankshaft and Engine repairs in Mangalore port Karnataka, Krishnapatnam Port /Visakhapatnam Port Andhra Pradesh, Kandla Port Gujarat, Ennore Port Tamil Nadu, JNPT Port Mumbai, Mormugao Port Goa, Chennai Port Tamil Nadu, Paradip Port Odisha, Kochi Port Kerala, Kolkata Port West Bengal, Tuticorin Port Tamil Nadu etc.


This blog is written by Mr. Raj Shahani (Managing Director of RA Power Solutions India Pvt. Ltd.).Mr. Shahani is a highly experienced business leader with rich experience of more than 41 years in the field of Power, Heavy and Shipping industry. He is Technical Adviser to many shipping and heavy industries across the globe.

Mr. Shahani is one of the most enthusiastic professional and he has all the brilliance of an exemplary leader. Mr. Shahani is an extremely effective coach and mentor of teams and is adept at providing leadership in a global, cross-cultural environment.

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Created on Jun 25th 2021 05:06. Viewed 383 times.


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