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. 208 I (CA_, CC_)
2. C-ELYSEE (DD_)
3. DS3
4. DS3 Convertible
5. C3 II (SC_)
6. 301
7. 2008 I (CU_)
8. 2008 I SUV (CU_)
9. 308 II (LB_, LP_, LW_, LH_, L3_)
10. 308 SW II (LC_, LJ_, LR_, LX_, L4_)
11. C1 II (PA_, PS_)
12. C4 CACTUS
13. 108
14. C4 II (B7)
15. DS4 (NX_)
16. 5008 (0U_, 0E_)
17. 3008 MPV (0U_)
18. C3 PICASSO (SH_)
19. C4 PICASSO II
20. C4 GRAND PICASSO II (DA_, DE_)
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.