A OPTIMAL 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. CARINA II Saloon (_T17_)
2. CARINA Mk II Saloon (_T17_)
3. CARINA II (_T17_)
4. CARINA II Liftback (_T17_)
5. CARINA Mk II (_T17_)
6. CAMRY (_V2_)
7. CAMRY Saloon (_V2_)
8. CAMRY (_V1_)
9. CAMRY Saloon (_V1_)
10. SCEPTER (_V1_)
11. CAMRY Estate (_V2_)
12. CAMRY Estate (_V1_)
13. SCEPTER Estate (_V1_)
14. CARINA E Saloon (_T19_)
15. CARINA E (_T19_)
16. CARINA E Liftback (_T19_)
17. CARINA E Sportswagon (_T19_)
18. RAV 4 I (_A1_)
19. RAV 4 � (_A1_)
20. CARINA II Estate (_T17_)
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.