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. LS (_F2_)
2. LS Saloon (_F2_)
3. LX (UZJ100)
4. LAND CRUISER 100 (_J1_)
5. LAND CRUISER (_J1_)
6. LAND CRUISER AMAZON (_J1_)
7. LAND CRUISER CYGNUS (_J1_)
8. PRADO (_J1_)
9. LAND CRUISER 100 (_J1_, _J10_)
10. MACHO (_J1_)
11. SEQUOIA (_K3_, _K4_)
12. SEQUOIA (_K6_)
13. CROWN (_S20_)
14. SC Convertible (UZZ40_)
15. SOARER Convertible (UZZ40_)
16. GX (_J12_)
17. GS (_S16_)
18. GS Saloon (_S16_)
19. LS (_F3_)
20. LS Saloon (_F3_)
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.