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. KANGOO Express (FC0/1_)
2. KANGOO Rapid (FC0/1_)
3. FLUENCE (L3_)
4. LOGAN MCV (KS_)
5. CLIO II (BB_, CB_)
6. CLIO Mk II (BB_, CB_)
7. LUTECIA II (BB_, CB_)
8. CLIO MIO II (BB_, CB_)
9. THALIA II (LU_)
10. SYMBOL II (LU_)
11. LAGUNA I Grandtour (K56_)
12. LAGUNA I Nevada (K56_)
13. LAGUNA I Estate (K56_)
14. LAGUNA I (B56_, 556_)
15. DUSTER (HS_)
16. MEGANE Scenic (JA0/1_)
17. MEGANE I Grandtour (KA0/1_)
18. MEGANE I Break (KA0/1_)
19. MEGANE I Coach (DA0/1_)
20. MEGANE I Coupe (DA0/1_)
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.