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. BARCHETTA (183_)
2. BRAVA (182_)
3. BRAVO I (182_)
4. DELTA II (836_)
5. DELTA Mk II (836_)
6. COUPE (175_)
7. 155 (167_)
8. MAREA (185_)
9. MAREA Weekend (185_)
10. 145 (930_)
11. 146 (930_)
12. 156 (932_)
13. GT (937_)
14. LYBRA (839_)
15. LYBRA SW (839_)
16. PUNTO (188_)
17. 156 Sportwagon (932_)
18. 147 (937_)
19. STILO (192_)
20. STILO Multi Wagon (192_)
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.