A vessel having a main engine of DEUTZ SBV 12M 628 reported failure of the crankshaft. The vessel was at Claxton Bay Port, Port of Spain. RA Power Solutions technicians with a seaman’s book immediately flew to Trinidad and Tobago as the visa was arranged on arrival.
The details of the DEUTZ SBV 12M 628 are as follows: –
| S. No. | Crankpin Details | |
| 1 | Engine Make | DEUTZ |
| 2 | Engine Model | SBV 12M 628 |
| 3 | Crankpin Diameter Standard | 175.00 MM |
| 4 | Crankpin Bearing Width | 146.00 MM |
| 5 | Grinding of Crankpin Number | #02 & #04 |
| 6 | Polishing of Crankpin Number | #01, #03, #05 & #06 |
| 7 | Place of Execution of Grinding of Crankpin | Claxton Bay Port, Port of Spain |
| 8 | Name of Shipping Company | Reputed Company from Trinidad and Tobago |
| 9 | Date Of Execution | 06.05.2026 to 21.05.2026 |
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| Crankpin Wear and Scoring Marks on Crankshaft of DUETZ SBV 12M 628 Engine | Damaged Crankpin of DUETZ SBV 12M 628 Engine |
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| MPI Testing on Crankpin of DUETZ SBV 12M 628 Engine | Crankshaft Inspection by MPI – DUETZ SBV 12M 628 |
Inspection and Repair of DEUTZ SBV 12M 628
After inspection of all the crankpins, it was decided to grind crankpin numbers 02 and 04, and balance crankpin numbers 01, 03, 05, and 06, which were polished.
The following final dimensions were maintained:
| SIZE OF CR PINS AFTER REPAIR | |||||||||
| A | Aa | C | CC | B | Bb | Min | Maxi | Ovality | |
| CR-1 | 174.95 | 174.93 | 174.93 | 174.94 | 174.90 | 174.94 | 174.90 | 174.95 | 0.05 |
| CR-2 | 173.50 | 173.48 | 173.47 | 173.48 | 173.49 | 173.49 | 173.47 | 173.50 | 0.03 |
| CR-3 | 174.94 | 174.93 | 174.95 | 174.94 | 174.93 | 174.92 | 174.92 | 174.95 | 0.03 |
| CR-4 | 174.50 | 174.49 | 174.47 | 174.48 | 174.49 | 174.49 | 174.47 | 174.5 | 0.03 |
| CR-5 | 174.93 | 174.94 | 174.94 | 174.92 | 174.94 | 174.95 | 174.92 | 174.95 | 0.03 |
| CR-6 | 174.93 | 174.92 | 174.94 | 174.94 | 174.95 | 174.94 | 174.92 | 174.95 | 0.03 |
The undersized bearings have been arranged by the client, and the engine has been commissioned.
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| Smooth Crankpin Finish After Grinding and Polishing – DUETZ SBV 12M 628 | Final Surface Finish of DUETZ SBV 12M 628 Crankshaft |
The above repair work on the DEUTZ SBV 12M 628 crankshaft was carried out successfully without removing the crankshaft from the engine. Precision grinding and polishing ensured that all crankpins were brought within acceptable limits with minimum ovality and proper surface finish. Following assembly with undersized bearings supplied by the client, the engine was commissioned successfully and is running satisfactorily.
For more information on onsite crankshaft repair, grinding of crankshaft, and crankshaft polishing, please email us at rajshahani@rapowersolutions.com, or info@rapowersolutions.com, or call us at +91 9582647131 or +91 9810012383.
