A KRAFT AUTOMOTIVE 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. ASTRA H Estate (A04)
4. ORLANDO (J309)
5. MOKKA / MOKKA X (J13)
6. CRUZE (J300)
7. ZAFIRA B Box Body/MPV (A05)
8. AVEO Hatchback (T300)
9. SONIC Hatchback (T300)
10. CRUZE Hatchback (J305)
11. AVEO Saloon (T300)
12. SONIC Saloon (T300)
13. CORSA D (S07)
14. ASTRA J GTC
15. ASTRA J Coupe
16. ASTRA Mk VI (J) GTC (P10)
17. CORSA Mk III (D) (S07)
18. ZAFIRA TOURER C (P12)
19. ZAFIRA C (P12)
20. ASTRA Mk IV (G) Convertible (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.