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. C3 I (FC_, FN_)
2. XSARA (N1)
3. XSARA Break (N2)
4. XSARA Estate (N2)
5. XSARA Coupe (N0)
6. 206 CC (2D)
7. 206 Hatchback (2A/C)
8. 307 (3A/C)
9. BERLINGO / BERLINGO FIRST MPV (MF_, GJK_, GFK_)
10. BERLINGO MPV (MF_, GJK_, GFK_)
11. PARTNER MPV (5_, G_)
12. PARTNER ESCAPADE MPV (5_, G_)
13. PARTNER (5_, G_)
14. RANCH MPV (5_, G_)
15. GRAND RAID MPV (5_, G_)
16. PARTNER PATAGONICA / URBANA MPV (5_, G_)
17. 307 SW (3H)
18. 206 SW (2E/K)
19. 307 Break (3E)
20. 307 Estate (3E)
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.