What are the causes of engine cracks?

[LaAurora]

Engine cracks can be caused by inherent manufacturing defects, improper usage, and inadequate maintenance. Manufacturing defects: Such as sand holes, shrinkage porosity, gas pores, as well as poor aging and stress concentration zones, which can lead to cracks in the engine block. Improper usage: For example, suddenly adding a large amount of cold water when the engine is overheated and lacks water; adding a large amount of hot water when starting the engine on a cold winter morning; starting the engine first and adding cold water only after the temperature rises; not using antifreeze in winter, parking for a long time without draining the cooling water, causing the cooling water to freeze and crack the engine block. Improper maintenance and repair: Not tightening the main bolts and auxiliary bolts as specified; using self-made water plugs with excessive interference; cracking the engine block during flipping due to lack of specialized repair tools. During usage and maintenance, the above issues should be noted to prevent engine block cracks.