How did that happen, it seems they were over torqued when being made?
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14 years ago
Re: Head bolt failure and Coolant Loss on 2002-2006 Toyota 2.4L engines
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14 years ago
Not to be too obvious, but head bolts aren't supposed to just loosen up in the first place. I'm guessing they skipped a step in assembly, or had materials problems.
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14 years ago
According to what I saw, the threads aren't robust enough. The fix appears to be Heli-coils. They sure as hell won't pull out!