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. TRAFIC II Bus (JL)
2. VIVARO A Platform/Chassis (X83)
3. ESPACE III (JE0_)
4. ESPACE Mk III (JE0_)
5. MOVANO Bus (X70)
6. MOVANO Van (X70)
7. MOVANO Platform/Chassis (X70)
8. MASTER II Bus (JD)
9. MASTER II Van (FD)
10. MASTER II Platform/Chassis (ED/HD/UD)
11. LAGUNA II (BG0/1_)
12. LAGUNA II Grandtour (KG0/1_)
13. LAGUNA II Sport Tourer (KG0/1_)
14. MOVANO Mk I (A) Combi (X70)
15. MOVANO Mk I (A) Van (X70)
16. MOVANO Mk I (A) Chassis/Cab (X70)
17. ESPACE IV (JK0/1_)
18. ESPACE Mk IV (JK0/1_)
19. INTERSTAR Bus (X70)
20. INTERSTAR Van (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.