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. SUPER 5 (B/C40_)
2. 9 (L42_)
3. 9 Saloon (L42_)
4. ALLIANCE (L42_)
5. 11 (B/C37_)
6. ENCORE (B/C37_)
7. 19 I (B/C53_)
8. 19 � (B/C53_)
9. 19 I Chamade (L53_)
10. 19 � Chamade (L53_)
11. 19 II Chamade (L53_)
12. 19 Mk II Chamade (L53_)
13. 19 II (B/C53_)
14. 19 Mk II (B/C53_)
15. 19 II Cabriolet (D53_, 853_)
16. 19 Mk II Cabriolet (D53_, 853_)
17. 21 Saloon (L48_)
18. 21 (B48_)
19. 21 Estate (K48_)
20. 21 Savanna (K48_)
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.