Engine Bearing | Crankpin Bearing | Main Journal Bearings
RA Power Solutions maintains main and auxiliary engine bearings for leading engine manufacturers and their various models.
With over 46 years of global experience in crankshaft repair, we understand the challenges shipowners and power plant operators face during engine overhauls. In many cases, undersized bearings for crankpins and main journals are not readily available in the market. As a result, engine commissioning is often delayed after the repair process.
Moreover, sourcing customized or non-standard bearing sizes can take considerable time. Project schedules are prolonged, operating expenses rise, and vessel downtime becomes inevitable as a result. Therefore, choosing a repair partner that can provide immediate technical solutions and alternative bearing support is critical for minimizing delays and ensuring smooth engine performance.
Maintenance of Stock of Crankpin | Main Journal Bearings by RA Power Solutions
We maintain a large stock of crankpin and main journal bearings for auxiliary and main engines of popular makes and models.
A few are described as follows:
| Sr No. | Description |
| Daihatsu 6DL-16 Standard Crankpin Diameter-120 mm | |
| 1 | a) 2.50 mm Undersized Crankpin Bearing |
| b) 3.00 mm Undersized Crankpin Bearing | |
| c) 4.00 mm Undersize Crankpin Bearing | |
| MAN CME 5L 16/24 Standard Crankpin Diameter- 130mm | |
| 2 | a) 0.50 mm Undersized Crankpin Bearing |
| b) 1.00 mm Undersized Crankpin Bearing | |
| c) 1.50 mm Undersized Crankpin Bearing | |
| d) 2.00 mm Undersized Crankpin Bearing | |
| e) 2.50 mm Undersized Crankpin Bearing | |
| Yanmar Engine S 185L Standard Crankpin Diameter—140 mm | |
| 3 | a) 0.80 mm Undersized Crankpin Bearing |
| b) 1.20 mm Undersized Crankpin Bearing | |
| c) 1.60 mm Undersized Crankpin Bearing | |
| d) 2.00 mm Undersized Crankpin Bearing | |
| Yanmar Engine 6N18AL-DN/DV Standard Crankpin Diameter—145 mm | |
| 4 | a) 0.40 mm Undersized Crankpin Bearing |
| b) 0.80 mm Undersized Crankpin Bearing | |
| c) 1.20 mm Undersized Crankpin Bearing | |
| d) 1.60 mm Undersized Crankpin Bearing | |
| e) 2.00 mm Undersized Crankpin Bearing | |
| f) 2.40 mm Undersized Crankpin Bearing | |
| g) 2.80 mm Undersized Crankpin Bearing | |
| Daihatsu 5DC-17 Standard Crankpin Diameter—145 mm | |
| 5 | a) 0.50 mm Undersized Crankpin Bearing |
| b) 1.00 mm Undersized Crankpin Bearing | |
| c) 1.50 mm Undersized Crankpin Bearing | |
| d) 2.00 mm Undersized Crankpin Bearing | |
| e) 2.50 mm Undersize Crankpin Bearing | |
| f) 3.00 mm Undersize Crankpin Bearing | |
| g) 4.00 mm Undersize Crankpin Bearing | |
| MAK 8M20 Standard Crankpin Diameter—152 mm | |
| 6 | a) Standard Undersized Crankpin Bearing |
| b) 1.00 mm Undersized Crankpin Bearing | |
| c) 1.50 mm Undersized Crankpin Bearing | |
| d) 2.00 mm Undersized Crankpin Bearing | |
| Daihatsu 5DK-20 Standard Crankpin Diameter—170 mm | |
| 7 | a) 0.50 mm Undersized Crankpin Bearing |
| b) 1.00 mm Undersized Crankpin Bearing | |
| c) 1.50 mm Undersized Crankpin Bearing | |
| d) 2.00 mm Undersized Crankpin Bearing | |
| e) 2.50 mm Undersize Crankpin Bearing | |
| f) 3.00 mm Undersize Crankpin Bearing | |
| g) 3.50 mm Undersize Crankpin Bearing | |
| h) 4.00 mm Undersize Crankpin Bearing | |
| i) 5.00 mm Undersized Crankpin Bearing | |
| MAN 6L 23/30H Standard Crankpin Diameter—185 mm | |
| 8 | Key Position *12.5 x 15.5 * |
| a) 0.50 mm Undersized Crankpin Bearing | |
| b) 1.00 mm Undersized Crankpin Bearing | |
| c) 1.50 mm Undersized Crankpin Bearing | |
| d) 2.00 mm Undersized Crankpin Bearing | |
| e) 2.50 mm Undersized Crankpin Bearing | |
| f) 3.00 mm Undersized Crankpin Bearing | |
| g) 4.00 mm Undersized Crankpin Bearing | |
| h) 5.00 mm Undersized Crankpin Bearing | |
| Key Position *7.7 x 10.7 * | |
| a) 0.50 mm Undersized Crankpin Bearing | |
| b) 1.00 mm Undersized Crankpin Bearing | |
| c) 1.50 mm Undersized Crankpin Bearing | |
| d) 2.00 mm Undersized Crankpin Bearing | |
| e) 2.50 mm Undersized Crankpin Bearing | |
| f) 3.00 mm Undersized Crankpin Bearing | |
| g) 4.00 mm Undersized Crankpin Bearing | |
| h) 5.00 mm Undersized Crankpin Bearing | |
| Allen Engine PVBCS 12 F Standard Crankpin diameter – 190.45 mm to 190.47 mm | |
| 9 | a) 0.50 mm Undersized Crankpin Bearing |
| b) 1.00 mm Undersized Crankpin Bearing | |
| MAN 9ASL 25/30 Standard Crankpin Diameter-195 mm | |
| 10 | a) 2.50 mm Undersize Crankpin Bearing |
| b) 3.00 mm Undersize Crankpin Bearing | |
| c) 4.00 mm Undersize Crankpin Bearing | |
| Gas Engine Deutz MWM TBG32V16 Standard Crankpin diameter 204.50 mm | |
| 11 | a) 0.50 mm Undersized Crankpin Bearing |
| MAN 9L28/32 H Standard Crankpin Diameter-230 mm | |
| 12 | a) 0.50 mm Undersized Crankpin Bearing |
| b) 1.00 mm Undersized Crankpin Bearing | |
| c) 1.50 mm Undersized Crankpin Bearing | |
| d) 2.00 mm Undersized Crankpin Bearing | |
| e) 2.50 mm Undersize Crankpin Bearing | |
| f) 3.00 mm Undersize Crankpin Bearing | |
| Daihatsu 8DKM-28 Standard Crankpin Diameter-235 mm | |
| 13 | a) 0.50 mm Undersized Crankpin Bearing |
| b) 1.00 mm Undersized Crankpin Bearing | |
| c) 1.50 mm Undersized Crankpin Bearing | |
| d) 2.00 mm Undersized Crankpin Bearing | |
| e) 2.50 mm Undersize Crankpin Bearing | |
| Daihatsu 8DK-32 Standard Crankpin Diameter-250 mm | |
| 14 | a) 0.50 mm Undersized Crankpin Bearing |
| b) 1.00 mm Undersized Crankpin Bearing | |
| c) 1.50 mm Undersized Crankpin Bearing | |
Development of Special-Size Crankpin and Main Journal Bearings
R A Power Solutions also maintains a stock of crankpin and main journal bearings that are undersized beyond the manufacturer’s recommendations. The ready availability of special-size bearings has saved many crankshafts from rejection.
Special-size crankpin and main journal bearings are critical to making sure an engine runs well after a crankshaft repair. When typical undersized bearings aren’t available, custom-engineered solutions are necessary to avoid expensive downtime and delays in commissioning. So, precision manufacture, precise dimensional control, and high-quality Babbitt lining are all done very carefully to meet the exact specifications for the crankpin and main journal.
Also, innovative manufacturing methods and thorough quality checks make sure that the load is evenly distributed, friction is low, and the life of the bearings is longer. Because of this, special-size journal bearings are a reliable choice for marine engines, power plants, and heavy industrial uses.
For undersized crankpin and main journal bearing requirements, please email us at info@rapowersolutions.com or call +91 9582647131 or +91 9810012383.
FAQs
Crankpin bearings support the crankpins, while main journal bearings support the crankshaft main journals; both reduce friction between moving parts and ensure smooth engine rotation, especially after grinding or repair work.
When crankpins or main journals are ground to remove wear or damage, their diameters are reduced. As a result, undersized bearings are needed to maintain correct clearances and proper lubrication.
Yes—the company maintains a large inventory of standard, undersized, and special-size crankpin and main journal bearings for many popular engine makes and models, helping minimize downtime.
RA Power Solutions supports top manufacturers such as Wartsila, Daihatsu, MAN, Sulzer, Yanmar, MWM, Caterpillar, MTU, Cummins, and more, with a wide range of bearing sizes in stock.
Absolutely — custom bearings made beyond OEM undersize limits can save crankshafts that would otherwise be rejected, ensuring reliable performance and reducing the need for costly replacements.
