A DAYCO 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. XSARA PICASSO (N68)
2. 206 Hatchback (2A/C)
3. 406 (8B)
4. 406 Saloon (8B)
5. 406 Break (8E/F)
6. 406 Estate (8E/F)
7. 406 Coupe (8C)
8. 206 CC (2D)
9. 607 (9D, 9U)
10. 607 Saloon (9D, 9U)
11. ZETA (22_)
12. EVASION MPV (22, U6)
13. SYNERGIE MPV (22, U6)
14. JUMPY (U6U_)
15. DISPATCH (U6U_)
16. JUMPY Van (BS_, BT_, BY_, BZ_)
17. DISPATCH Van (BS_, BT_, BY_, BZ_)
18. EXPERT (224_)
19. XSARA (N1)
20. XSARA Break (N2)
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.