The tensioner extends due to the spring pressure, true. But it has an internal cam type deal, that prevents it's retraction, unless done manually, as descibed above. So when you remove it, the spring pushes it out to full extension. And if installed without releiving it, damage is done. Sometimes more readily seen immediately, sometimes not, if the engine has enough time on it to have already stretched the chain considerably, and or, worn the guides.
All I'm saying, is yours is parobably maxxed out, and not capable of any further adjusting, so as wear piles up, and future stretching occurs, there will be nothing left to compensate.
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