RA Power Solutions was invited by a company based in Italy to repair the crankshaft of MAK 8 M20 on board a vessel that was at anchorage in Saudi Arabia.
RA Power Solutions team of two well-experienced technicians along with an insitu crankshaft grinding machine was deputed to Saudi Arabia. On arrival, the crankshaft was inspected by our technicians. The following are the main specifications:
The Engine and crankshaft details of the MAK 8 M20 are given below:
| S.No | Crankshaft Details | |
| 1. | Engine Make | MAK |
| 2. | Engine Model | 8 M20 |
| 3. | Crankpin Diameter Standard | 152 mm |
| 4. | Crankpin Bearing Width | 69 mm |
| 5. | Place of Execution of Job | Dammam Drydock in South Arabia |
Observations:
- The MAK 8 M20 crankpins have a standard diameter of 152 mm and a crankpin bearing width of only 69 mm.
- The dimensional inspection of all the crankpins was undertaken.
- Excessive ovality up to 0.26 mm was observed in all eight crankpins of the engine.
- On visual inspection, the radius fillet profile was also found damaged.
- Hardness was checked by the portable hardness tester and was observed within limits.
- As a matter of routine, the crack detection was done.
- No crack abnormality was observed.
- Bearing line marks, the rough surface was observed in the case of all crankpins.
Action taken by RA Power Solutions technicians for successful Repair of the crankshaft
- All the crankpins were undersized by 0.5 mm.
- The important parameters like ovality were controlled within 0.02 mm.
- The surface finish was maintained of less than 15 RA value far better than the International standard.
- The final readings of crank pins after grinding were as follows:
SIZE OF CR PINS (SIZES IN MM)
| A | Aa | C | Cc | B | Bb | Min | Max | Ovality | |
| CR-1 | 151.49 | 151.48 | 151.49 | 151.48 | 151.49 | 151.50 | 151.48 | 151.50 | 0.02MM |
| CR-2 | 151.48 | 151.49 | 151.49 | 151.50 | 151.49 | 151.50 | 151.48 | 151.50 | 0.02MM |
| CR-3 | 151.49 | 151.49 | 151.50 | 151.48 | 151.48 | 151.49 | 151.48 | 151.50 | 0.02MM |
| CR-4 | 151.49 | 151.49 | 151.48 | 151.50 | 151.50 | 151.49 | 151.48 | 151.50 | 0.02MM |
| CR-5 | 151.49 | 151.50 | 151.49 | 151.48 | 151.48 | 151.49 | 151.48 | 151.50 | 0.02MM |
| CR-6 | 151.48 | 151.49 | 151.49 | 151.50 | 151.49 | 151.48 | 151.48 | 151.50 | 0.02MM |
| CR-7 | 151.50 | 151.49 | 151.49 | 151.48 | 151.49 | 151.50 | 151.48 | 151.50 | 0.02MM |
| CR-8 | 151.49 | 151.50 | 151.49 | 151.48 | 151.48 | 151.49 | 151.48 | 151.50 | 0.02MM |
RA Power Solutions is ISO 9001:2015 (Quality Management System) & ISO 14001:2015 (Environmental Management System) certified approved company.
We have been regularly executing the onsite 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, MAK Engine 6M20 Crank Pin Grinding, please email us at rajshahani@rapowersolutions.com, or info@rapowersolutions.com, or call us at +91 9582647131 or +91 9810012383.
