The YANMAR 6N18L-SV auxiliary engine aboard a vessel was involved in a serious accident. The company dispatched three technicians, including a metal stitching expert and a crankshaft grinding specialist, to the vessel at Fujairah Port, Dubai.
The Yanmar Engine details are as follows:
| S. No. | Crankpin Details | |
| 1. | Engine Make | 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 |
| Damaged Crankpin of Yanmar Engine |
| Damaged Engine Block of Yanmar Repaired By Metal Lock |
YANMAR 6N18L-SV Auxiliary Engine Accident Details –
The YANMAR 6N18L-SV auxiliary engine experienced a significant failure due to the following issues:
- Connecting Rod Bolt Failure:
The connecting rod bolts in crankpin unit #02 failed, causing the connecting rod to hit the engine block.ck.
2. Engine Block Damage:
The window cover sitting area of the engine block sustained severe damage. The casting was shattered into multiple pieces.
3. Additional Damage:
The incident completely broke the window cover of the engine block. It also extensively damaged crankpin unit #02 of the crankshaft.
Hardness Inspection of Crank Pin
| Metal Stitching Of Yanmar Block |
Inspection of Crankshaft and Engine Block of YANMAR 6N18L-SV:
The team inspected the damaged crankpin unit #02 based on the following parameters:
(a) The dimensional inspection of crankpin unit #02 revealed an ovality of 0.16 mm.
(b) The impact from the connecting rod caused the crankpin to develop deep depressions and noticeable impact marks.
(c) The team observed that the radius fillet profile on both sides was severely damaged.
(d) The team detected minor hairline cracks on the crankpin, which, based on our experience, typically appear after such a severe incident.
(e) The team observed higher-than-normal hardness at certain spots.
(f) The engine block sustained severe damage, as evidenced by the photographs, with the total length of the cracks measuring 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 | |||||||||
| Crack Repair By Metal Locking |
| Metal Stitching of Yanmar Engine Block Under Process |
Actions Taken for Repair of Crankshaft and Engine Block of YANMAR 6N18L-SV:
(i) The technicians found crankpin unit #02 undersized by 1.20 mm, in line with the Yanmar engine manufacturerâs recommendation. They then adjusted the final crankpin diameter to 143.80 mm, maintaining the 1.20 mm undersize.
ii) The damaged engine block was repaired by our technicians using the metal lock process, as described above. The total length of the crack was 46 inches.
(iii) The team replaced the damaged inspection window cover.
(iv) RA Power Solutions Pvt. Ltd. supplied a 1.2 mm undersized crankpin bearing.
(v) The team commissioned the engine and observed its performance to be satisfactory.
| 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 consistently perform on-site crankshaft repairs and insitu crankshaft grinding in locations such as Dubai, Fujairah, Qatar, Saudi Arabia, Oman, Iraq, Togo, Malta, Freetown, Egypt, Malaysia, Iran, Indonesia, Vietnam, Jordan, and many more.
For more information about our crankpin grinding repair services, please email us at info@rapowersolutions.com or call +91 9582647131 or +91 9810012383.
| Engine Block Window After Repair By Metal Lock |
| Engine Block Window After Repair |
| Engine Block Metal Stitched |