A 3RG 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. KAPPA (838_)
2. DOBLO Box Body/MPV (223_)
3. DOBLO MONOCAB (223_)
4. BRAVA (182_)
5. BRAVO I (182_)
6. MAREA (185_)
7. MAREA Weekend (185_)
8. BRAVO II (198_)
9. RITMO III (198_)
10. KAPPA SW (838_)
11. 156 (932_)
12. 9-3 Convertible (YS3F)
13. 9-3 (YS3F, E79, D79, D75)
14. 9-3 Saloon (YS3F, E79, D79, D75)
15. ASTRA H Estate Van (L70)
16. ASTRA H Van (L70)
17. GRANDE PUNTO (199_)
18. PUNTO (199_)
19. 9-3 Estate (E50)
20. 166 (936_)
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.