Crankshaft bearings reduce the friction in the areas where it gets in contact with connecting rods and the mounting seats in the engine block. They spread the lubricant evenly over the mating surfaces of components and ensure the proper positioning of engine elements relative to each other. Depending on the location, there are main bearings and connecting rod bearings.
6 tips on how to use and replace them
- It is recommended to replace the parts when it is required. Manufacturers do not limit their service life.
- It is necessary to use only the engine oil recommended by the car manufacturer. Besides, it is important to monitor the working fluid level and replace it timely together with the oil filter. Thus, the risk of serious engine malfunctions becomes lower.
- Main crankshaft bearings or connecting rod bearings must be replaced as a set. Both types of parts have to be installed simultaneously when the power unit is overhauled.
- If you don’t have the necessary skills and required equipment for such repairs, it is worth visiting a service station. In particular, to dismantle the parts a vehicle lift is used.
- If you repair the vehicle yourself, you must be extremely careful in order to prevent dirt from getting inside the engine and the lubricating system.
- When new car parts are being mounted it is necessary to apply the tightening torque stated by the manufacturer. As a rule, this parameter differs for main and connecting rod bearings.
Malfunctions of crankshaft bearings, their causes and symptoms
- Abrasive wear. It is caused by contaminated working fluid. Knocking, clearly heard when the engine is idling, might be a symptom of this defect.
- Destruction by excessive loads. It happens in the case of incomplete combustion, for instance. Besides, the car part can melt on the surface due to crankshaft journal deformation of the and the lack of lubricant. Signs of thermal damage and deterioration are extraneous sounds coming from the unit.
- Cavitation erosion. It appears due to the inhomogeneity of the motor oil and can be caused by the coolant getting into it. In this case, you can hear knocking coming from the engine.
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