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. 18 Variable (135_)
2. 18 Break (135_)
3. 20 (127_)
4. 21 Saloon (L48_)
5. 21 (B48_)
6. 21 Estate (K48_)
7. 21 Savanna (K48_)
8. 25 (B29_)
9. FUEGO (136_)
10. ESPACE I (J11_)
11. ESPACE � (J11_)
12. TRAFIC Bus (TXW)
13. ESPACE II (J/S63_)
14. ESPACE Mk II (J/S63_)
15. CX II
16. 505 (551A)
17. 505 Break (551D)
18. SAFRANE I (B54_)
19. SAFRANE � (B54_)
20. 18 (134_)
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.