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. ASTRA F Convertible (T92)
2. CORSA B (S93)
3. VITA B (S93)
4. TIGRA (S93)
5. VECTRA B Hatchback (J96)
6. VECTRA B (J96)
7. ASTRA F Hatchback (T92)
8. ASTRA F (T92)
9. OPTIMA F (T92)
10. ASTRA F Estate (T92)
11. VECTRA B Estate (J96)
12. ASTRA Mk III (F) Hatchback (T92)
13. CORSA Mk I (B) (S93)
14. TIGRA Mk I (S93)
15. LACETTI Estate (J200)
16. VECTRA (B) Saloon (J96)
17. VECTRA (B) Hatchback (J96)
18. ASTRA G Hatchback (T98)
19. ASTRA G Estate (T98)
20. ASTRA G Coupe (T98)
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.