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

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

Product Details:

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Product Description

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:


S. NO

 Crankshaft Details

 

1

 Engine Make

MAN

2

Engine Model

9 ASL 25/30

3

Crank pin Diameter Standard

195 mm

4

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.   



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.





R. A. POWER SOLUTIONS PVT. LTD.

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