Daihatsu 8DK32 Crankshaft Repair | While Sailing from Durban, South Africa, to Mumbai Port
Failure of a Daihatsu 8DK32 crankshaft was reported by one of our clients based in Greece. The failure was of a serious nature, as bearing material was found in the oil sump under five nos of crankpins.
In order to inspect and undertake grinding of the crankshaft of the Daihatsu 8DK32, having a standard diameter of 250.00 mm and a bearing width of 120.00 mm, two (2) technicians, along with an onsite crankshaft grinding machine and measuring instruments, were deputed and boarded the vessel at Durban anchorage.
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| Damaged Crankpin of Daihatsu 8DK32 Diesel Engine | Crankpin having scoring marks on Daihatsu 8DK32 Marine Engine |
The details of the Daihatsu 8DK32 engine crankshaft are as follows:
| S. No. | Crankpin Details | |
| 1 | Engine Make | Daihatsu |
| 2 | Engine Model | 8DK32 |
| 3 | Auxiliary Engine No | #04 |
| 4 | Crankpin Diameter Standard | 250.00 MM |
| 5 | Crankpin Bearing Width | 120.00 MM |
| 6 | Grinding of Crankpin Number | #02, #04, #05, #06 & #08 |
| 7 | Place of Execution of Grinding of Crankpin | Durban, South Africa, to Mumbai Port (while sailing of the vessel) |
| 8 | Name of Shipping Company | Reputed Company from Greece |
| 9 | Date of Execution | 24.07.2026 to 10.08.2026 |
The Daihatsu 8DK32 crankshaft, after disassembly, was subjected to a detailed inspection as per our company's protocol. The main observations are as follows:
i) Bearing material was found in the oil sump of the entablature at the positions of crankpins No. 02, 04, 05, 06, and 08.
ii) The connecting rods were disassembled to facilitate the inspection of the damaged crankpins.
iii) The crankpins were subjected to dimensional inspection, and excessive ovality was observed. The crankpin dimensions are as follows:
| SIZE OF CR PINS BEFORE REPAIR | |||||||||
| A | Aa | C | Cc | B | Bb | Min | STD | Ovality | |
| CR-1 | |||||||||
| CR-2 | 249.94 | 249.87 | 249.93 | 249.64 | 249.93 | 249.97 | 249.64 | 250.00 | 0.36 |
| CR-3 | |||||||||
| CR-4 | 249.94 | 249.83 | 249.80 | 249.96 | 249.81 | 249.95 | 249.80 | 250.00 | 0.20 |
| CR-5 | 249.94 | 249.92 | 249.78 | 249.94 | 249.78 | 249.92 | 249.78 | 250.00 | 0.22 |
| CR-6 | 249.95 | 249.92 | 249.80 | 249.94 | 249.80 | 249.95 | 249.80 | 250.00 | 0.20 |
| CR-7 | |||||||||
| CR-8 | 249.93 | 249.86 | 249.81 | 249.98 | 249.78 | 249.92 | 249.78 | 250.00 | 0.22 |
iv) Due to the failure of the crankpin bearings of crankpins No. 02, 04, 05, 06, and 08 and continued running of the engine, deep scoring/line marks were observed on all the crankpins.
v) All other parameters, such as hardness, crack detection by MPI, and crankshaft deflection, were observed to be within limits.
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| MPI Testing of Daihatsu 8DK32 Engine Crankshaft | Hardness Testing of Daihatsu 8DK32 Crankpin |
Action Taken by RA Power Solutions to Repair the Daihatsu 8DK32 Crankshaft
i) Crankpins No. 02, 04, 05, 06, and 08 were ground undersize depending on the depth of the scoring marks.
ii) The crankpins were undersized, ranging from 0.50 mm to 2.50 mm.
iii) After grinding, all crankpins were polished to achieve the required surface finish.
iv) The final measurement of the repaired crankpins was recorded and verified against the required undersize dimensions.
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| Onsite Crankpin Machining of Daihatsu 8DK32 Engine | Smooth Surface of Crankpin After Grinding of Daihatsu 8DK32 Auxiliary Engine |
Supply of Undersized Bearings for Daihatsu 8DK32 by RA Power Solutions
All the required undersize bearings were supplied by RA Power Solutions. Following the crankshaft repair and installation of the undersize bearings, the engine has been performing satisfactorily.
For more information on onsite crankshaft repair, crankshaft grinding, and crankshaft polishing, please email us at rajshahani@rapowersolutions.com or info@rapowersolutions.com, or call us at +91 9582647131 or +91 9810012383.