Cast iron is one of the most commonly used materials for engine bearing covers, its price is relatively cheap, and has good wear resistance, high compressive strength, corrosion resistance and good castability.
The important role of engine bearing cover:
1. Fixing and supporting the engine crankshaft.
2. Protect the bearing from interference from the external environment and effectively extend the service life of the bearing
3. The bearing cover can withstand the pressure exerted by the lubricating oil and prevent the oil from leaking or overflowing.
4. Prevent dust and impurities from entering the bearing. 
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