A SWAG 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. TRAFIC Bus (TXW)
2. DUCATO Bus (230_)
3. DUCATO Van (230_)
4. DUCATO Panorama (290_)
5. DUCATO Platform/Chassis (290_)
6. TRAFIC Van (TXX)
7. ARENA Combi (A97)
8. ARENA Van (TB, TF)
9. ARENA Van (A97)
10. DUCATO Platform/Chassis (230_)
11. MASTER I Van (T__)
12. MASTER I Bus (T__)
13. DUCATO Van (290_)
14. MOVANO Mk I (A) Chassis/Cab (X70)
15. DUCATO Van (244_)
16. DUCATO Bus (244_)
17. DUCATO Platform/Chassis (244_)
18. TRAFIC Platform/Chassis (PXX)
19. TRAFIC Rodeo (PXX)
20. MASTER I Platform/Chassis (P__)
21. See more in applications

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.