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. COROLLA (_E10_)
2. COROLLA Saloon (_E10_)
3. COROLLA Compact (_E10_)
4. COROLLA SECCA Compact (_E10_, AE102)
5. COROLLA Liftback (_E10_)
6. COROLLA Estate (_E10_)
7. PASEO Coupe (EL54_)
8. CYNOS Coupe (EL54_)
9. STARLET (_P9_)
10. COROLLA Estate (_E11_)
11. COROLLA (_E11_)
12. COROLLA Saloon (_E11_)
13. COROLLA Compact (_E11_)
14. COROLLA Liftback (_E11_)
15. PASEO Convertible (EL54_)
16. CYNOS Convertible (EL54_)
17. 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.