A HERTH+BUSS JAKOPARTS 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. 340-360 (343, 345)
2. 340-360 Saloon (344)
3. 480 E (482)
4. 440 K (445)
5. 460 L (464)
6. 460 L Saloon (464)
7. RAPID Box Body/MPV (F40_, G40_)
8. EXPRESS Box Body/MPV (F40_, G40_)
9. EXTRA Van (F40_, G40_)
10. EXTRA Box Body/MPV (F40_, G40_)
11. MEGANE I (BA0/1_)
12. MEGANE I Coach (DA0/1_)
13. MEGANE I Coupe (DA0/1_)
14. MEGANE I Classic (LA0/1_)
15. MEGANE Scenic (JA0/1_)
16. S40 I (644)
17. S40 I Saloon (644)
18. V40 Estate (645)
19. CARISMA (DA_)
20. CARISMA Saloon (DA_)
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.