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. KADETT D (31_-34_, 41_-44_)
2. KADETT D Estate (35_, 36_, 45_, 46_)
3. KADETT E Hatchback (T85)
4. KADETT E (T85)
5. MONZA E (T85)
6. KADETT E Estate (T85)
7. KADETT E Convertible (T85)
8. ASCONA C Hatchback (J82)
9. ASCONA C (J82)
10. VECTRA A Hatchback (J89)
11. VECTRA A (J89)
12. OMEGA A (V87)
13. OMEGA A Estate (V87)
14. MANTA B CC (53_, 55_)
15. MANTA B Hatchback (53_, 55_)
16. MANTA B (58_, 59_)
17. CALIBRA A (C89)
18. ASTRA F Hatchback (T92)
19. ASTRA F (T92)
20. OPTIMA F (T92)
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.