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. MERIVA Mk I (A) (X03)
2. ASTRA G Hatchback (T98)
3. ASTRA G Saloon (T98)
4. ASTRA G Estate (T98)
5. ASTRA Mk IV (G) Hatchback (T98)
6. ASTRA Mk IV (G) Estate (T98)
7. ASTRA Mk IV (G) Saloon (T98)
8. CORSA C (X01)
9. VITA C (X01)
10. CORSA Mk II (C) (X01)
11. CORSAVAN Mk II (C) Hatchback Van (X01)
12. CORSA C Hatchback Van (X01)
13. CIVIC VII Hatchback (EU, EP, EV)
14. MERIVA A MPV (X03)
15. ASTRAVAN Mk V (H) Estate Van (A04)
16. ASTRAVAN Mk IV (G) Estate Van (T98)
17. ASTRA G Estate Van (F70)
18. ASTRA G Delvan (F70)
19. ASTRA H Estate Van (L70)
20. ASTRA H Van (L70)
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.