A DAYCO 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 E Saloon (_T19_)
2. CARINA E (_T19_)
3. CARINA E Liftback (_T19_)
4. COROLLA Compact (_E10_)
5. COROLLA SECCA Compact (_E10_, AE102)
6. COROLLA Liftback (_E10_)
7. CELICA Coupe (_T20_)
8. CARINA E Sportswagon (_T19_)
9. COROLLA Estate (_E10_)
10. COROLLA (_E10_)
11. COROLLA Saloon (_E10_)
12. COROLLA Estate (_E11_)
13. COROLLA (_E11_)
14. COROLLA Saloon (_E11_)
15. COROLLA Compact (_E11_)
16. COROLLA Liftback (_E11_)
17. AVENSIS (_T22_)
18. AVENSIS Liftback (_T22_)
19. AVENSIS Estate (_T22_)
20. 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.