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O problema aqui não foi a porca, que é um elemento sacrificial. O problema foi o fio de rosca do próprio pino articulador da bieleta. Quando a rosca do pino já vem com material inferior, usinagem mal feita ou tratamento térmico irregular, ela perde resistência ao torque. O resultado é espanar com facilidade, mesmo aplicando o aperto correto. Isso mostra claramente a queda de qualidade em algumas peças atuais. A rosca do pino deveria suportar o torque especificado sem deformação. Quando isso nã
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