Why do you think you need a new tensioner? Your old one is probably still good. The shop manuals dont explain much about these. They are spring loaded and only return when you insert a flat blade screwdriver in the back and rotate the screw clockwise. The shaft is supposed to stay in the body of the tensioner when the screw is turned fully clockwise. If it doesn't. Install the tensioner a little at a time, taking the pressure off the timimg chain by turning the screw clockwise. Its meant to keep a constant pressure on the chain. Taking up slack and never backing off. I learned this lesson the hard way.
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