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 Model | 6N18AL-SV |
| 3. | Crankpin Diameter Standard | 145.00 MM |
| 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 –
The YANMAR 6N18L-SV auxiliary engine experienced a significant failure due to the following issues:
- Connecting Rod Bolt Failure: The connecting rod bolts in the crankpin unit #02 failed, causing the connecting rod to hit the engine block.
- Engine Block Damage: The window cover of the engine block’s sitting area sustained severe damage. The casting was shattered into multiple pieces.
- Additional Damage: The incident completely broke the window cover of the engine block. It also extensively damaged crankpin unit #02 on the crankshaft.
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 noticed severe damage on both sides of the radius fillet profile.
(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 | 0.16 mm |
| CR-3 | |||||||||
| CR-4 | |||||||||
| CR-5 | |||||||||
| CR-6 | |||||||||
| CR-7 | |||||||||
| CR-8 | |||||||||
| CR-9 | |||||||||
| CR-10 | |||||||||
Actions Taken for Repair of Crankshaft and Engine Block of YANMAR 6N18L-SV:
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 recommendation from the Yanmar engine manufacturer. 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 | 0.02 mm |
| CR-3 | |||||||||
| CR-4 | |||||||||
| CR-5 | |||||||||
| CR-6 | |||||||||
| CR-7 | |||||||||
We consistently perform onsite crankshaft repairs and in situ 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.
