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. 155 (167_)
3. 145 (930_)
4. 146 (930_)
5. GTV (916_)
6. SPIDER (916_)
7. DELTA II (836_)
8. DELTA Mk II (836_)
9. DEDRA (835_)
10. DEDRA SW (835_)
11. COUPE (175_)
12. MAREA (185_)
13. MAREA Weekend (185_)
14. 156 (932_)
15. 166 (936_)
16. 166 Saloon (936_)
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18. LYBRA SW (839_)
19. 156 Sportwagon (932_)
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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.