I know this post is a little old, but there seems to be a disreprency, as there are different types of tensioners. That little piston assembly is like a hydraulic lifter, it's gotta be primed. If it's already stuck together, do like I did- if there is any thing to grab on to ie; the little plunger, grab it with a vice and rotate the outer cylinder, and pull, it should pop apart. I did this and installed it, but it collapsed again, so far that I couldn't get a hold of the piston the second time, so I just threw it on the concrete in anger, and it popped out. It was then that I noticed the little holes in the piston, they relieve the extra oil pressure and probably allowed the oil to leak out while you had the engine apart.
I took the little gadget and put it in some motor oil and pumped it in small increments, you'll notice it will suck oil in and get stiff. gettin it in after that was a little tough, just cram it up in there and use a screwdriver against the timing chain casing to move it around until you get the bolt holes lined up. I hope this helps someone
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