A SNR 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. MEGANE I (BA0/1_)
2. MEGANE I Classic (LA0/1_)
3. MEGANE Scenic (JA0/1_)
4. SANDERO
5. KANGOO (KC0/1_)
6. CLIO II (BB_, CB_)
7. CLIO Mk II (BB_, CB_)
8. LUTECIA II (BB_, CB_)
9. CLIO MIO II (BB_, CB_)
10. KANGOO Express (FC0/1_)
11. KANGOO Rapid (FC0/1_)
12. LOGAN Pickup (US_)
13. MEGANE I Grandtour (KA0/1_)
14. MEGANE I Break (KA0/1_)
15. SANDERO/STEPWAY I (BS_)
16. THALIA I (LB_)
17. CLIO SYMBOL I (LB_)
18. CLIO I Saloon (LB_)
19. SYMBOL I (LB_)
20. LOGAN (LS_)
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.