The last time I changed the cam belt was when I had the engine out to do a big end repair, so the bracket holding the AC unit was already removed when I pulled the engine. I had the sump off so I was able to wedge a piece of wood between the block and one of the crankshaft counterweights, I used a 6 foot scaffold pole on the end of the wrench and as you said “can't believe how tight that bolt was”. The cam belt tensioner I replaced just as precaution as I had one seize on a previous supra which ended up with belt shredded. When they go they sound like a Flymo grass edge trimmer.
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