A TOPRAN 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 J Sports Tourer (P10)
2. ASTRA Mk VI (J) Estate (P10)
3. MERIVA Mk II (B) (S10)
4. ZAFIRA Mk II (B) (A05)
5. ASTRA H Estate Van (L70)
6. ASTRA H Van (L70)
7. ASTRA Mk VI (J) (P10)
8. ASTRA J (P10)
9. ASTRA Mk VI (J) GTC (P10)
10. ASTRAVAN Mk V (H) Estate Van (A04)
11. ASTRA J GTC
12. ASTRA J Coupe
13. MERIVA A MPV (X03)
14. ASTRA G Hatchback (T98)
15. ASTRA G Saloon (T98)
16. ASTRA G Estate (T98)
17. ASTRA Mk IV (G) Hatchback (T98)
18. ASTRA Mk IV (G) Saloon (T98)
19. ASTRA Mk IV (G) Estate (T98)
20. ASTRA H (A04)
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.