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. C-MAX II (DXA/CB7, DXA/CEU)
2. GRAND C-MAX (DXA/CB7, DXA/CEU)
3. C4 II (B7)
4. 508 I (8D_)
5. 508 SW I (8E_)
6. 5008 (0U_, 0E_)
7. 5 (CW)
8. PREMACY (CW)
9. C30 (533)
10. DS4 (NX_)
11. C4 PICASSO I MPV (UD_)
12. 3 Saloon (BL)
13. AXELA Saloon (BL)
14. 3 (BL)
15. AXELA (BL)
16. 3 SPORT (BL)
17. C4 GRAND PICASSO I (UA_)
18. GALAXY (WA6)
19. S-MAX (WA6)
20. MONDEO IV (BA7)
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.