A SWAG 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. 21 (B48_)
2. 21 Saloon (L48_)
3. 21 Estate (K48_)
4. 21 Savanna (K48_)
5. ESPACE I (J11_)
6. ESPACE � (J11_)
7. TRAFIC Bus (TXW)
8. ESPACE II (J/S63_)
9. ESPACE Mk II (J/S63_)
10. SAFRANE I (B54_)
11. SAFRANE � (B54_)
12. TRAFIC Van (TXX)
13. 21 Estate Van (S48_)
14. MASTER I Van (T__)
15. TRAFIC Platform/Chassis (PXX)
16. TRAFIC Rodeo (PXX)
17. TRAFIC Platform/Chassis (P6)
18. TRAFIC Rodeo (P6)
19. MASTER I Platform/Chassis (P__)
20. MASTER I Bus (T__)
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.