cracked timing belt cover on my '99 camry, 4cyl
where one of the upper bolts secure the cover there is a crack, overtightening I assume. Will this cause a problem
to the belt or engine?
No, it should not... You might want to cover the crack with something so dirt or dust can't get in but as long as its not terribly warped and hitting the belt or drive, you should be just fine.
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