A guy at this link,
http://www.corolland.com/forums/inde...s-for-9th-gen/, had the following to say about removing the bolt.
Quote:
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Then, the main bolt won't come out all the way because it is so long it hits the side of the car's frame before it can be fully removed. The TSB doesn't mention this. I was afraid I was going to have to remove the upper engine mount and lift the engine. Luckily, I was able to get enough clearance by lifting the engine without removing the engine mount. I just put a floor jack under the oil pan (with a piece of wood for protection) and jacked it up a few pumps. Just the little bit of clearance by taking the weight off the engine mount was enough.
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And a poster (see post #7) in that thread indicates he was able to remove the bolt/entire tensioner assembly without having to jack up the engine or remove/loosen the mounting bolts. It looks like some are able to remove the assembly easily others are not.
While replacing the tensioner assembly if the serpentine belt hasn't been replaced, consider replacing it with a Goodyear Gatorback belt, they are much better than the stock OEM belt from Toyota according to many Corolla users on various Corolla boards.