A SNR 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. DUCATO Bus (230_)
2. DUCATO Van (230_)
3. DUCATO Van (280_)
4. KANGOO BE BOP (KW0/1_)
5. MASTER II Van (FD)
6. MASTER II Platform/Chassis (ED/HD/UD)
7. MASTER II Bus (JD)
8. DUCATO Platform/Chassis (230_)
9. MASTER I Van (T__)
10. MASTER I Bus (T__)
11. LAGUNA III Grandtour (KT0/1)
12. LAGUNA III Sport Tourer (KT0/1)
13. LAGUNA III Sportour (KT0/1)
14. MASTER I Platform/Chassis (P__)
15. DAILY I Platform/Chassis
16. DAILY II Platform/Chassis
17. DAILY I Van
18. DAILY II Van
19. DAILY II Dump Truck
20. LAGUNA Coupe (DT0/1)
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.