Crankshaft bearings are the main bearings that support the crankshaft. The two ball bearings sit on the left and right of the crankwebs on the journals. These ball bearings must carry and withstand heavy loads and must always be well lubricated to ensure that the engine runs smoothly. ... In our shop we offer inexpensive crankshaft bearings in OEM quality from Motoforce and Naraku, we also carry high quality SKF bearings from Stage6 or Polini. In most cases the bearings are available in a pack with the matching O-ring oil seals, but they can also be purchased separately, just like the crankshaft bearings themselves.