A FAI AutoParts 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. DUCATO Bus (250_, 290_)
2. DUCATO Bus (250_, 290_, 560_)
3. DUCATO Van (250_, 290_)
4. DUCATO Platform/Chassis (250_, 290_)
5. DAILY IV Bus
6. DUCATO Van (244_)
7. DUCATO Bus (244_)
8. DUCATO Platform/Chassis (244_)
9. DAILY III Platform/Chassis
10. DAILY III Van
11. DAILY IV Platform/Chassis
12. DAILY IV Van
13. DAILY IV Dump Truck
14. DAILY V Platform/Chassis
15. DAILY V Dump Truck
16. DAILY V Van
17. DAILY VI Platform/Chassis
18. DAILY VI Van
19. DAILY III Bus
20. DAILY SCUDATO III Bus
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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.