Some mechanics prefer to apply a thin layer of butter on the cylinder block when installing the cylinder head gasket, thinking it helps improve the seal. However, this practice is actually not recommended. When the engine runs, the high temperatures can cause the butter to melt, leading to gaps between the cylinder head, block, and gasket, which increases the risk of gas leakage. Moreover, the butter can carbonize under heat, accelerating the aging of the gasket and making future removal and installation more difficult. This can also lead to unnecessary repair complications.
When installing a piston pin, it's important not to use an open flame to heat the piston. The reason is that open flame heating causes uneven expansion due to its high thermal coefficient, which can easily distort the piston shape. Additionally, it's hard to control the temperature when using an open flame, leading to inconsistent heating. The correct method is to immerse the piston in hot oil, which provides even and controlled heating, ensuring safe and effective installation without damaging the component. Always follow proper procedures to avoid costly mistakes and ensure long-lasting performance.
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