A HERTH+BUSS JAKOPARTS 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. AVENSIS Liftback (_T22_)
2. AVENSIS (_T22_)
3. AVENSIS Estate (_T22_)
4. COROLLA Compact (_E11_)
5. COROLLA Liftback (_E11_)
6. COROLLA Estate (_E11_)
7. PREVIA (_R3_)
8. TARAGO (_R3_)
9. PREVIA / ESTIMA (_R3_)
10. ESTIMA (_R3_)
11. AVENSIS VERSO (_M2_)
12. VERSO SPORTVAN (_M2_)
13. IPSUM (_M2_)
14. PICNIC (_M2_)
15. COROLLA (_E11_)
16. COROLLA Saloon (_E11_)
17. RAV 4 II (_A2_)
18. RAV 4 Mk II (_A2_)
19. RAV 4 II SUV (_A2_)
20. COROLLA (_E12_)
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.