MAK 8M20 crankshaft machining and grinding has been undertaken by RA Power Solutions recently. The company has more than forty-three years of experience in onsite crankshaft machining and crankshaft repair. In the case of MAK 8M20, one crankpin was reported damaged. The vessel was at port Nouakchott. Our team of two technicians with a compact, lightweight, and latest design of onsite crankshaft grinding machine was deputed to port Nouakchott.
The major technical details of the crankshaft are given below:
| S. No. | Crankshaft Details | |
| 1. | Engine Make | MAK |
| 2. | Engine Model | 8M20 |
| 3. | Crankpin Diameter Standard | 152 mm |
| 4. | Crankpin Bearing Width | 71 mm |
| 5. | Place of execution of crankshaft repair | Nouakchott Port Mauritania |
- On going through the above major technical details of the crankshaft it can be seen that the crankpin width is as small as 71 mm and it is difficult for the onsite crankshaft grinding machine to be placed on the crankpin diameter for machining.
- RA Power Solutions has designed a dedicated tooling to undertake grinding of the MAK 8M20 crankpin having a bearing width of only 71 mm.
- Our team of two technicians inspected the crankpin and observed the ovality of 0.56 mm. The readings are posted below.
| SIZE OF CR Pins (mm) | |||||||||
| A | Aa | C | Cc | B | Bb | Min | STD | OVALITY | |
| CR-1 | |||||||||
| CR-2 | |||||||||
| CR-3 | 151.56 | 151.86 | 151.45 | 151.92 | 151.44 | 151.47 | 151.44 | 152.00 | 0.56 mm |
- All the parameters like hardness, MPI, and deflection were observed within limits.
- Grinding with a portable crankshaft grinding machine was undertaken. The diameter of 152.00 mm was reduced to 151.00 (1.0 mm undersize).
- Final readings after crankpin machining/crankpin grinding are pasted below:
| SIZE OF CR Pins (mm) | |||||||||
| A | Aa | C | Cc | B | Bb | Min | STD | OVALITY | |
| CR-1 | |||||||||
| CR-2 | |||||||||
| CR-3 | 150.98 | 150.99 | 150.99 | 150.98 | 150.98 | 150.98 | 150.98 | 151.00 | 0.02 mm |
- The undersize bearing was supplied by RA Power and the engine was successfully put back in operation within 15 hrs of boarding the vessel by our technicians.
For the specific engine and their model crankshaft repair, you may visit our blogs on the website RA Power Solutions or write to us to share the reports of various complicated repairs of crankshaft executed by us. RA Power Solutions is ISO 9001:2015 (Quality Management System) & ISO 14001:2015 (Environmental Management System) certified approved company.
We have been regularly executing on-site crankshaft repairs and crankshaft grinding in Dubai, Oman, Saudi Arabia, Qatar, Abu Dhabi, Sharjah, Ajman, Umm Al-Quwain, and Fujairah, Bahrain, Kuwait, Iraq, Antigua and Barbuda, Belize, Dominica, Dominican Republic, Grenada, Guyana, Haiti, Jamaica, Saint Kitts and Nevis, Saint Lucia, Saint Vincent and the Grenadines, Trinidad, and Tobago, etc.
For more details on the Repair of the engine and supply of bearings and crankshaft machining polishing please email us at rajshahani@rapowersolutions.com, or info@rapowersolutions.com, or call us at +91 9582647131 or +91 9810012383.
