A TOPRAN 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. LAGUNA I (B56_, 556_)
3. LAGUNA I Grandtour (K56_)
4. LAGUNA I Nevada (K56_)
5. LAGUNA I Estate (K56_)
6. LAGUNA II (BG0/1_)
7. LAGUNA II Grandtour (KG0/1_)
8. LAGUNA II Sport Tourer (KG0/1_)
9. TRAFIC II Bus (JL)
10. TRAFIC II Van (FL)
11. TRAFIC Van (FL)
12. VIVARO A Bus (X83)
13. VIVARO A Van (X83)
14. MOVANO Bus (X70)
15. MOVANO Van (X70)
16. MASTER II Bus (JD)
17. MASTER II Van (FD)
18. MOVANO Mk I (A) Combi (X70)
19. MOVANO Mk I (A) Van (X70)
20. INTERSTAR Bus (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.