A leading shipping company based in Italy reported a failure of its Auxiliary Engine, Yanmar 8N 330L EV, near Panama. Due to the failure of Auxiliary Engine, they were not able to sail. RA Power Solutions was contacted by the client for repair of crankshaft of Yanmar 8N 330L EV. The Client shared with us the photographs of damaged crankpins.
On going through the basic reports shared by the Chief Engineer of the vessel the following action was taken.

Action Taken By RA Power Solutions For Repair of Crankshaft Yanmar 8N 330L EV

i) Since the vessel was anchored near Panama Port, RA Power Solutions deputed two technicians having a valid US VISA and Seaman book. Both technicians flew to Panama along with onsite crankshaft grinding machine and measuring instruments and boarded the vessel within 48 hours of the client’s first information of the breakdown of crankshaft of Yanmar 8N 330L EV.

The Details of Engine / Crankpin are as following:

S. No	Crankpin Details
1.	Engine Make	YANMAR
2.	Engine Model	8N330L-EV
3.	Crankpin Diameter Standard	260.00 MM
4.	Crankpin Bearing Width	115.00 MM
5.	Place of Execution of Grinding of Crankpin	Panama Port
6.	Name of Shipping Company	Reputed Company from Italy

 

ii) RA Power Solutions technicians inspected all the crankpins (8 Nos) to check the taper & ovality, the dimensions of observed are pasted below.

SIZE OF CR PINS BEFORE REPAIR
	A	Aa	C	Cc	B	Bb	Min	STD	Ovality
CR-1	259.92	259.94	259.94	259.94	259.90	259.93	259.90	260.00	0.10MM
CR-2	259.84	259.72	259.62	259.57	259.88	259.92	259.57	260.00	0.43MM
CR-3	259.90	259.92	259.91	259.93	259.92	259.91	259.90	260.00	0.10MM
CR-4	259.91	259.94	259.92	259.93	259.95	259.94	259.91	260.00	0.09MM
CR-5	259.92	259.94	259.90	259.93	259.91	259.92	259.90	260.00	0.10MM
CR-6	259.90	259.93	259.91	259.94	259.92	259.93	259.90	260.00	0.10MM
CR-7	259.93	259.94	259.91	259.93	259.93	259.92	259.91	260.00	0.09MM
CR-8	259.91	259.94	259.93	259.92	259.93	259.93	259.91	260.00	0.09MM

iii) On going through the readings, it was observed that the crankpin number #02 has developed excessive ovality of 0.43 MM, against the tolerance of 260.00 MM + 0.03 MM. This is considered very much on the higher side. All other crankpins also have ovality ranging from 0.09 MM to 0.10 MM, The bearing line marks and rough surface on the crankpin were observed.

iv) As a Protocol, hardness was checked of eight (8 Nos) Crankpins and was observed within limits.

v) Crack detection was also conducted, and no crack was observed on damaged crankpin number #02 and other crankpins.

vi) It was jointly decided to undertake the grinding of crankpin number #02 and polishing the remaining crankpins to remove the bearing line marks and to improve the surface finish.

vii) Although in the crankpin numbers #01,#03,#04,#05,#06,#07, and #08 the ovality was observed on the higher side as 0.10 MM, however, this was accepted under divation.

viii) The Crankpin number #02 was undersized by 1.5 MM, A Final Dimensional Report after grinding and polishing of crankpins of Yanmar 8N 330L EV is pasted below.

SIZE OF CR PINS AFTER REPAIR
	A	Aa	C	Cc	B	Bb	Min	STD	Ovality
CR-1	259.92	259.94	259.94	259.94	259.90	259.93	259.90	260.00	0.10MM
CR-2	259.48	258.49	258.48	258.48	258.49	258.50	248.48	258.50	0.02MM
CR-3	259.90	259.92	259.91	259.93	259.92	259.91	259.90	260.00	0.10MM
CR-4	259.91	259.94	259.92	259.93	259.95	259.94	259.91	260.00	0.09MM
CR-5	259.92	259.94	259.90	259.93	259.91	259.92	259.90	260.00	0.10MM
CR-6	259.90	259.93	259.91	259.94	259.92	259.93	259.90	260.00	0.10MM
CR-7	259.93	259.94	259.91	259.93	259.93	259.92	259.91	260.00	0.09MM
CR-8	259.91	259.94	259.93	259.92	259.93	259.93	259.91	260.00	0.09MM

 

ix) In order to assist ship staff, our technicians undertook the dimensional and MPI Inspection of connecting rods available on the vessel, they were observed within limits.

The engine was commissioned during the presence of our technicians on the vessel.

 

We have been regularly executing on site crankshaft repairs and In Situ crankshaft grinding in Dubai, Fujairah, Qatar, Saudi Arabia, Oman, Iraq, Togo, Malta, Freetown, Egypt, Malaysia, Iran, Indonesia, Vietnam, Jordan, etc.

We have a team of trained technicians available 24/7 hrs and can be deputed on short notice. Some of our technicians also have valid US VISA and can fly to South America, Caribbean countries, etc.

 

For more information regarding crankshaft grinding services, please contact us at rajshahani@rapowersolutions.com or info@rapowersolutions.com or call us at +91 9582647131 or +91 9810012383.