The bearing seized and damaged the Daihatsu 6DK-20 auxiliary engine crankshaft. The authorities did not permit the vessel to cross the Suez Canal because the auxiliary engine was not operational.
RA Power Solutions technicians were deployed from New Delhi and boarded the vessel at the Suez Canal. Following are main details of Daihatsu 6DK-20 Crankshaft Repair and engine.
| S. No. | Crank Pin Details | |
| 1. | Engine Make | Daihatsu |
| 2. | Engine Model | 6DK-20 |
| 3. | Crankpin Diameter Standard | 170.00 MM |
| 4. | Crankpin Bearing Width | 78.00 MM |
| 5. | Place of Execution of Grinding of Crankpin | Suez Canal (Egypt) |
Details of the Inspection of the Crankshaft of Daihatsu 6DK-20 undertaken by Technicians
- During the visual inspection, we found crankpin #6 of the crankshaft damaged. The remaining crankpins were in good condition.
- The hardness of the crankpin was checked and observed on the higher side in some spots.
- After removing the bearing material from the crankpin, we carried out a crack detection test. We observed multiple hairline cracks.
- The crankpin number #6 was subject to dimensional inspection. Against the standard diameter of 170.00 MM. The Minimum diameter observed was 169.26 MM, thus the ovality of 0.74 MM.
The report is pasted below:
SIZE OF CR JOURNAL
| A | Aa | C | Cc | B | Bb | Min | STD | Ovality | |
| CR-1 | |||||||||
| CR-2 | |||||||||
| CR-3 | |||||||||
| CR-4 | |||||||||
| CR-5 | |||||||||
| CR-6 | 169.31 |
169.96 |
169.26 |
169.93 |
169.29 |
169.93 |
169.26 |
170.00 |
0.74MM |
| CR-7 | |||||||||
| CR-8 | |||||||||
| CR-9 | |||||||||
| CR-10 |
Action Taken By RA Power Solutions for the Repair of the Damaged Crankpin
- We initially ground crankpin #6 to a size of 169.00 mm, which is 1.00 mm undersize from the standard diameter.
- Since the crankpin still had ovality and damage line marks, we jointly decided with the Chief Engineer to undersize the crankpin by 2.00 mm. We maintained the final size of the crankpin at 168.00 mm.
| Hardness Test of Crankpin | Grinding of Daihatsu DK-20 Crankpin |
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Supply of Crankpin Undersize Bearing by RA Power Solutions Pvt Ltd
RA Power Solutions technicians carried with them undersized bearings of 1.5 MM/2.0 MM/2.5 MM. The 2.00 MM bearing was retained by the ship staff and the engine was commissioned. The Auxiliary engine as on date is performing satisfactory.
In this case, time was short. RA Power technicians hand-carried a 2.00 mm undersize bearing, which greatly helped the client. The team commissioned the engine within four hours of grinding the crankpin.
| Daihatsu 6 DK-20 Crankpin After Grinding to 2.0 mm Undersize |
Daihatsu Crankpin After Polishing |
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RA Power Solutions maintains a stock of 6DK-20 engines, up to 4.00 MM undersize bearings, and have saved number of crankshafts from rejection.
For more information regarding crankshaft grinding services, Daihatsu 6DK-20 Crankshaft Repair please contact us at rajshahani@rapowersolutions.com or info@rapowersolutions.com or call us at +91 9582647131 or +91 9810012383.
