The tensioner must be disassembled, the plunger removed and reassembled, removing the whole body isn't going to work.

Yes the timing chain will rotate when the engine is turned, that is good as it shows the chain is engaged with the lower crank gear teeth. If the chain doesn't rotate with the engine it isn't taught on the gear and will jam in the front cover.

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"Rudeness is a weak man's imitation of strength" - Eric Hoffer