MAN 9 ASL 25/30 Crankshaft Repair/in situ Crankshaft Grinding RA Power Solutions
by RAPower Solutions RA PowerRA 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.
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.
Content Source : https://rapowersolution.blogspot.com/2021/06/man-9-asl-2530-crankshaft-repairin-situ.html
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Created on Jun 25th 2021 05:06. Viewed 376 times.