A FEBI BILSTEIN brand Tensioner Pulley, timing belt is a part of the timing belt drive, which serves to bypass the belt in a certain place or several places and is a freely rotating pulley of small diameter.

The composition of the roller is small: it is the roller mount, the internal rolling bearing with a protective oil seal, and the working body of the roller itself, which is in contact with the belt.

1. BARCHETTA (183_)
2. BRAVA (182_)
3. BRAVO I (182_)
4. DELTA II (836_)
5. DELTA Mk II (836_)
6. COUPE (175_)
7. 155 (167_)
8. MAREA (185_)
9. MAREA Weekend (185_)
10. 156 (932_)
11. GT (937_)
12. LYBRA (839_)
13. LYBRA SW (839_)
14. PUNTO (188_)
15. 156 Sportwagon (932_)
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17. STILO (192_)
18. STILO Multi Wagon (192_)
19. GTV (916_)
20. SPIDER (916_)
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The principles of the timing belt tensioner work

Excessive tension leads to intensive wear of the timing parts - pulley bearings (water pump, generator, tensioner, etc.), the belt itself, and others. In addition, a tight belt stretches faster and shortens its service life. Too little preload is fraught with more serious problems - slipping of the belt along the toothed pulleys of the camshafts, which leads to a violation of the valve timing and deterioration of the entire engine.

Therefore, a tensioning device is introduced into the timing drive in the form of rollers of one design or another, which, during engine operation, maintain an optimal belt tension.