This intentional deformation allows the washer to fill microscopic imperfections on the metal surfaces, preventing oil from leaking out under the constant pressure and heat of the engine oil. A small drip might seem harmless, but it leads to a loss of oil, which directly threatens engine lubrication and longevity.
Oil Drain Plug Washer Installation Guide: Proper Techniques for a Reliable Seal
It is typically thicker in the center and thinner at the edges. Under-tightening will not provide a proper seal.
The design of the washer itself is engineered for controlled failure. This occurs when the washer is over-tightened, incorrectly installed, or simply reused.
Proper Installation of Oil Drain Plug Washers for a Reliable Seal
They conform exceptionally well to the mating surfaces, creating a superior seal. Every seasoned mechanic understands the quiet frustration of a stripped oil drain plug.
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