YANMAR 6N18L-SV Auxiliary Engine Crankshaft and Engine Block Repair on Vessel

YANMAR 6N18L-SV Auxiliary engine on board a vessel met with a serious accident. Three (3) technicians consisting of metal stitching expert and crankshaft grinding were deputed on the vessel at Fujairah Port, Dubai.

The Yanmar Engine details are as following:-

 

S. No.	Crankpin Details
1.	Engine Make	YANMAR YANMAR
2.	Engine Modal	6N18AL-SV
3.	Crankpin Diameter Standard	145.00MM
4.	Crankpin Bearing Width	64.00 MM
5.	Place of Execution of Grinding of Crankpin	Fujairah Port, UAE
6.	Name of Shipping Company	Reputed Company from Dubai

YANMAR 6N18L-SV Auxiliary Engine Accident Details:

 

1. Connecting Rod bolts of crankpin unit number #02 failed, resulting in the connecting rod hitting the engine block.
2. Engine block window cover sitting area was badly damaged. The casting was broken into pieces.
3. The window cover of the engine block was also broken and the crankpin unit number #02 of the crank shaft was damaged.

Inspection of Crankshaft and Engine Block of YANMAR 6N18L-SV. Damaged crankpin unit number #02 was inspected for the following parameters.

(a) Dimensional Inspection of crankpin unit number #02 showed ovality of 0.16 MM.

(b) Due to hitting of connecting rod, the crankpin developed deep depressions and hitting marks.

(c) Radius fillet profile of both the sides was badly damaged.

(d) Minor hairline cracks were observed on crankpin, which is common, as per our experience after such a serious accident.

(e) Hardness at a few spots was observed on the higher side.

(f) The engine block was badly damaged, as shown in the photographs. The total crack length was measured as 46 Inches.

 

SIZE OF CR PIN AFTER DAMAGE
	A	Aa	C	Cc	B	Bb	Min	STD	Ovality
CR-1
CR-2	144.92	144.85	144.93	144.84	144.84	144.85	144.84	145.00	0.16MM
CR-3
CR-4
CR-5
CR-6
CR-7
CR-8
CR-9
CR-10

 

Action taken for Repair of Crankshaft and Engine Block of YANMAR 6N18L- SV:

 

i) The crankpin unit number #02 was undersized by 1.20 MM, as per the recommendation of the Yanmar Engine manufacturer. The final size of the crankpin was maintained as 143.80 MM. The crank pin diameter was maintained 1.20 mm undersize.

ii) The damaged engine block was repaired by our technicians by metal lock process as mentioned above, the total length of crack was 46 inches.

iii) Damaged inspection window cover was replaced.

iv) Undersize crankpin bearing of 1.2 MM was supplied by RA Power Solutions Pvt Ltd.

v) Engine was commissioned and performance was observed satisfactorily.

 

SIZE OF CR PIN AFTER REPAIR
	A	Aa	C	Cc	B	Bb	Min	STD	Ovality
CR-1
CR-2	143.78	143.78	143.79	143.80	143.79	143.78	143.78	143.80	0.02MM
CR-3
CR-4
CR-5
CR-6
CR-7

 

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.

For more details of the crank pin grinding repair please email us on info@rapowersolutions.com Call at +91 9582647131, +91 9810012383.