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HOPouring water onto a glowing hot engine can cause serious damage because of rapid temperature shock. Metal expands when it’s hot, and when cold water hits it suddenly, the surface cools and contracts much faster than the inner layers. That uneven contraction creates extreme stress inside the metal, which can lead to cracking or warping of engine components.
This is especially risky for parts like engine blocks, cylinder heads, and exhaust components that are already under high pressure. What seems like a quick way to cool things down can turn a minor overheating issue into a major repair. Letting an engine cool gradually protects the metal’s integrity and prevents long-term damage that can’t be reversed.
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