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. DUCATO Bus (230_)
2. DUCATO Van (230_)
3. DUCATO Panorama (290_)
4. DUCATO Platform/Chassis (290_)
5. DUCATO Bus (244_)
6. DUCATO Van (244_)
7. DUCATO Platform/Chassis (230_)
8. DUCATO Van (290_)
9. BOXER Bus (230P)
10. BOXER Platform/Chassis (ZCT_)
11. BOXER Van (230L)
12. BOXER FURGON Van (230L)
13. JUMPER Bus (230P)
14. RELAY Bus (230P)
15. JUMPER Platform/Chassis (230)
16. RELAY Platform/Chassis (230)
17. JUMPER Van (230L)
18. RELAY Van (230L)
19. BOXER Bus (244, Z_)
20. JUMPER Bus (244, Z_)
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.