A OPTIMAL 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. A3 (8P1)
2. A3 / S3 (8P1)
3. GOLF V (1K1)
4. RABBIT V (1K1)
5. TOURAN (1T1, 1T2)
6. ALTEA (5P1)
7. A3 Sportback (8PA)
8. A4 (8EC, B7)
9. A4 Saloon (8EC, B7)
10. A4 / S4 (8EC, B7)
11. TOLEDO III (5P2)
12. A4 Avant (8ED, B7)
13. A4 / S4 Avant (8ED, B7)
14. OCTAVIA II (1Z3)
15. LAURA II (1Z3)
16. OCTAVIA II Combi (1Z5)
17. PASSAT (3C2)
18. PASSAT Saloon (3C2)
19. PASSAT / Magotan (3C2)
20. JETTA III (1K2)
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.