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. 155 (167_)
2. TIPO (160_)
3. DEDRA (835_)
4. TEMPRA (159_)
5. TEMPRA S.W. (159_)
6. TEMPRA SW (159_)
7. DUCATO Panorama (290_)
8. DUCATO Bus (230_)
9. 145 (930_)
10. DELTA II (836_)
11. DELTA Mk II (836_)
12. DEDRA SW (835_)
13. 146 (930_)
14. DUCATO Van (230_)
15. DUCATO Panorama (280_)
16. DUCATO Van (280_)
17. DUCATO Van (290_)
18. BRAVA (182_)
19. BRAVO I (182_)
20. C25 Bus (280_, 290_)
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.