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. MEGANE III Coupe (DZ0/1_)
2. MEGANE CC (EZ0/1_)
3. MEGANE I (BA0/1_)
4. LAGUNA I (B56_, 556_)
5. LAGUNA I Grandtour (K56_)
6. LAGUNA I Nevada (K56_)
7. LAGUNA I Estate (K56_)
8. ESPACE III (JE0_)
9. ESPACE Mk III (JE0_)
10. SCENIC I MPV (JA0/1_, FA0_)
11. VIVARO A Platform/Chassis (X83)
12. VIVARO A Bus (X83)
13. VIVARO A Van (X83)
14. CLIO II (BB_, CB_)
15. CLIO Mk II (BB_, CB_)
16. LUTECIA II (BB_, CB_)
17. CLIO MIO II (BB_, CB_)
18. LAGUNA II (BG0/1_)
19. LAGUNA II Grandtour (KG0/1_)
20. LAGUNA II Sport Tourer (KG0/1_)
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.