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. LS (_F1_)
2. LS Saloon (_F1_)
3. LS (_F2_)
4. LS Saloon (_F2_)
5. LAND CRUISER 100 (_J1_)
6. LAND CRUISER (_J1_)
7. LAND CRUISER AMAZON (_J1_)
8. LAND CRUISER CYGNUS (_J1_)
9. PRADO (_J1_)
10. LAND CRUISER 100 (_J1_, _J10_)
11. MACHO (_J1_)
12. GS (_S16_)
13. GS Saloon (_S16_)
14. SEQUOIA (_K3_, _K4_)
15. GX (_J12_)
16. LS (_F3_)
17. LS Saloon (_F3_)
18. SC Convertible (UZZ40_)
19. SOARER Convertible (UZZ40_)
20. GS (_S19_)
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.