This permanent deformation is the key to its reliability, ensuring a leak-proof seal for the life of the component. They are generally considered semi-reusable; while they can often be reinstalled a few times, it is best practice to replace them with each oil change to guarantee a perfect seal.
Crush Washer Material Selection for a Reliable, Leak-Proof Seal
As you torque the drain plug, the metal of the washer flows into the microscopic imperfections of the drain port and the plug, filling any gaps that would otherwise allow oil to leak. Before inserting the new washer, always clean the drain port on the oil pan thoroughly to remove any old debris or hardened metal particles.
Rubber gaskets can degrade over time due to exposure to high temperatures and old oil, leading to hardening and eventual failure. Wipe the drain plug thread clean as well.
Crush Washer Material Selection for Optimal Seal and Reusability
This final step is essential, as it ensures the washer deforms correctly without being over-tightened, which could strip the threads. Hand-tighten the plug securely, then use a torque wrench to apply the manufacturer's specified torque.
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