I had a timing cover explode on my 1987 celica a few years ago, the timing belt went once, so me and my dad did the repair, but forgot to tighten the tensioner when we put it back together, to be short, two weeks later it was on the side of the highway, no belt to be found, and a timing cover with the shape of the belt cut out of the center when the belt jumped its path, really glad the 3sfe isn't one of those engines that gets totally wrecked when the timing belt goes