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Here's a picture of my old tensioner. It was working, but had taken a "set" from age and heat. I've taken the picture as it would be mounted on the car, but from the rear (as viewed from the driver's seat). Note that when the flats are perpendicular to the ground, the pulley is at about 4:30 - 5:00. Viewed from the front, this would be around 7:00 - 7:30. A new one may be closer to 6:30 - 7:00. When the adj. nut is turned CW, it will move the pulley toward the 6:00 position. If you have this type of tensioner and it deviates significantly from the picture, replace the tensioner. If it's the original it's already been subjected to tension and heat for 10 years. If there's a significant number of miles on it in addition, you might want to replace it just as preventive maintenance.
Hope this helps
Gary
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