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. C4 I Saloon
2. C4 PALLAS I Saloon
3. 408
4. C4 PICASSO I MPV (UD_)
5. 307 Saloon
6. C4 I (LC_)
7. C5 II (RC_)
8. C5 II Break (RE_)
9. 307 (3A/C)
10. 307 Break (3E)
11. 307 Estate (3E)
12. 307 SW (3H)
13. 307 CC (3B)
14. 407 SW (6E_)
15. 407 (6D_)
16. 407 Saloon (6D_)
17. 807 (EB_)
18. C8 (EA_, EB_)
19. JUMPY (VF7)
20. DISPATCH (VF7)
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.