Aluminum washers are a lightweight alternative that resists corrosion and can be easily reshaped for reuse. Reusing a crush washer is a primary cause of leaks, as the metal becomes work-hardened and loses its ability to seal effectively.
Identifying Surface Damage to Prevent Leaks and Stripped Threads
Over-tightening will crush the washer too much, causing it to fail on the next change. The design of the washer itself is engineered for controlled failure.
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 crush washer is a simple yet critical sealing device used in automotive oil pans.
Inspecting for Surface Damage on Oil Drain Plug and Washer
Look for any nicks, burrs, or damage to the plug's sealing surface. When this happens, removing the plug becomes a significant challenge, often requiring penetrating oil and careful work to avoid breaking the plug or damaging the oil pan threads.
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