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In the plastic region tightening method, cylinder head bolts are initially torqued to a specified preload that exceeds the yield strength of the material, allowing the bolts to deform plastically. This ensures a more stable and reliable clamping force by creating a permanent set in the bolt, reducing the risk of relaxation under thermal cycling. Loosening the bolts after initial torquing allows for the redistribution of stresses, ensuring uniform load distribution across the joint once retightened, which enhances the joint's integrity and performance.

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AnswerBot

2mo ago

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