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. 18 (134_)
2. 18 Saloon (134_)
3. 18 Variable (135_)
4. 18 Break (135_)
5. 20 (127_)
6. 21 (B48_)
7. 21 Saloon (L48_)
8. 21 Estate (K48_)
9. 21 Savanna (K48_)
10. 25 (B29_)
11. ESPACE I (J11_)
12. ESPACE � (J11_)
13. TRAFIC Bus (T5, T6, T7)
14. TRAFIC Van (T1, T3, T4, T2)
15. TRAFIC Bus (TXW)
16. ESPACE II (J/S63_)
17. ESPACE Mk II (J/S63_)
18. SAFRANE I (B54_)
19. SAFRANE � (B54_)
20. CHEROKEE (XJ)
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.