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. VIVARO A Platform/Chassis (X83)
2. S40 I (644)
3. S40 I Saloon (644)
4. V40 Estate (645)
5. CARISMA (DA_)
6. CARISMA Saloon (DA_)
7. SPACE STAR MPV (DG_A)
8. LAGUNA II (BG0/1_)
9. LAGUNA II Grandtour (KG0/1_)
10. LAGUNA II Sport Tourer (KG0/1_)
11. TRAFIC II Bus (JL)
12. TRAFIC II Van (FL)
13. TRAFIC Van (FL)
14. VIVARO A Bus (X83)
15. VIVARO A Van (X83)
16. MOVANO Bus (X70)
17. MOVANO Van (X70)
18. MASTER II Bus (JD)
19. MASTER II Van (FD)
20. MOVANO Mk I (A) Combi (X70)
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.