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 1. Home
 2. Our Blog
 3. Crankpin Repair of Yanmar S185L-ST Crankshaft | On Board Grinding of
    Crankshaft of Yanmar S185L-ST Engine


CRANKPIN REPAIR OF YANMAR S185L-ST CRANKSHAFT | ON BOARD GRINDING OF CRANKSHAFT
OF YANMAR S185L-ST ENGINE


A LEADING SHIPPING COMPANY BASED IN SAUDI ARABIA REPORTED A SERIOUS ACCIDENT OF
THEIR AUXILIARY ENGINE NO. 2 OF YANMAR S185L-ST USED AS GENERATOR.

 Team consisting of two technicians along with necessary calibrated  instruments
and onsite crankshaft grinding machine boarded the vessel in order to access the
damage to the engine and undertake necessary repairs.


MAJOR YANMAR S185L-ST ENGINE DETAILS ARE AS FOLLOWING:-

S. NO

Crankshaft Details

 

1

Engine Make

Yanmar

2

Engine Model

S185L-ST Engine

3

Crankpin Diameter Standard

140 mm

4

Crankpin Bearing Width

62 mm

5

  Name of Vessel

MV THE ABLA





ON INSPECTION OF THE CRANKSHAFT, FOLLOWING WERE THE MAIN OBSERVATIONS:-

 * On the visual inspection of crankpin no. 1 having a standard diameter of 140
   mm and bearing width of 62 mm , it was observed that big end bearing  failed
   and bearing material got embedded on the crankpin no.1 journal surface.
 * The crank pin journal surface had multiple bearing line marks, rough and was
   severely scored.
 * The radius fillet of both the sides was damaged losing its original profile.
 * Considering this to be a serious accident, all the connecting rods were
   disassembled and crank pins were subject to thorough inspection by our
   technicians.
 * No deviations were observed in other crankpins on dimensional inspection.
 * The hardness of crankpin no.1 was checked after removing the bearing from
   the crankpin journal which got embedded due to seizure of the bearing and
   observed within limit.
 * The crack detection test was done by high intensity magna flux torch
   and MPI equipment.
 * No abnormality or cracks were observed.
 * This was a big relief to our technicians as considering the serious nature of
   the accident, surface cracks in crank pin no. 1 were expected.
 * Deflection of the crankshaft was taken and was observed within limits.





FOLLOWING ARE THE READINGS OBSERVED:-

The crankpin no.1 was subject to dimensional inspection and following readings
were observed:-

Crankpin no. 1, Minimum diameter observed before repair - 139.50 mm

Crankpin no. 1, Maximum diameter observed before repair - 139.88 mm

Total ovality observed - 0.50 mm, considering the standard diameter of 140 mm.

REPAIRS UNDERTAKEN BY RA POWER SOLUTIONS FOR SUCCESSFUL OPERATION OF CRANKSHAFT
OF YANMAR S185L-ST ENGINE:-

 * Initially the crank pin having a standard diameter of 140 mm and bearing
   width of only 62 mm was ground to 0.50 mm under size with a hope 
   the scratches and deep line marks will be removed.
 * Since even after grinding 0.50 mm, the deep line marks were clearly visible,
   it was decided to under size the crank pin further by 0.5 mm.

FINALLY THE CRANKPIN NO. 1 WAS GROUND TO 1 MM UNDER SIZE AND  DIMENSIONS WERE
MAINTAINED AS FOLLOWING AFTER GRINDING:-

Minimum diameter observed after grinding  - 138.98 mm

Maximum diameter observed after grinding - 139.00 mm

Maximum ovality observed - 0.02 mm

The undersized bearing of 1 mm was supplied by RA Power Solutions from their
stock and engine was put back into operation.


MAIN FEATURES OF EXECUTING SUCCESSFUL CRANKPIN REPAIR OF  YANMAR S185L-ST
ENGINE:-

 * A company has experience of more than four decades in the field of crankshaft
   repair having experienced technicians trained in in-house training school.
 * Manufactures its own on site crankshaft grinding machine using it for the
   last 25 years. This facilitates us even to grind shafts in limited space
   available.
 * Only company in the world which can undertake the grinding of small diameter
   and main journal like in case of Yanmar S185L-ST having a diameter of 140 mm
   and bearing length of only 62 mm. This really needs a compact on site
   crankshaft grinding machine.
 * Only company in the world which can execute the grinding of crankshaft while
   the vessel is on move maintaining the tolerance of 0.01/0.02 mm with surface
   finish of less than 20 RA value.
 * Maintaining under size and special size of bearings in stock, hence no time
   is wasted to put back the engine into operation.
 * All technicians having Indian CDC can fly to any destination in the world in
   a short notice.
 * The on site crankshaft grinding machine is carried by our technicians as an
   accompanied baggage and no need of booking the machine in cargo and wasting
   the time in custom clearance etc.
 * Light-weight machine costing less in terms of air freight charges towards the
   transportation.
 * We are considered offering our services on lowest cost in the world.
 * For reduction in cost of the maintenance and to put back engines
   into operation , contact us.

We have been executing the repairs in Laos, Lebanon, Malaysia, Maldives,
Mongolia, Nepal, North Korea, Oman, Philippines, Qatar, Russia, Saudi Arabia,
Singapore, South Korea, Sri Lanka, Syria, United Arab Emirates, Yemen 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 40 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.

For more information about Crankpin Repair, contact
us on raj.shahani@rapowersolutions.com or info@rapowersolutions.com or call us
at +91-9582647131 or +919810012383

Visit our
website:  http://rapowersolutions.com/ or https://crankshaftgrindingrepair.com/




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INSITU GRINDING OF CRANKSHAFT OF YANMAR S185L-ST CRANKSHAFT

CRANKSHAFT REPAIR OF YANMAR S185L-ST CRANKSHAFT

TECHNICIAN DOING CRANKPIN REPAIR OF YANMAR S185L-ST CRANKSHAFT

 * Bhavnagar Port
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RA Power Solutions provides the onsite crankshaft grinding repair services
around the world for the last four decades.

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 * 411, 4th Floor, Unitech Arcadia,
   South City II, Gurgaon,Haryana (India)
 * +91 - 124 – 437 8292 / +91 9582647131
 * info@rapowersolutions.com

© 2019 Crankshaft Grinding Repair. All rights reserved.


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