The timing belt tensioner is a load-bearing pulley located on an adjustable axle. Its main function is belt tension; additional functions are to damp drive vibrations and increase the angle of the camshaft pulley wrap.

1. 19 II (B/C53_)
2. 19 Mk II (B/C53_)
3. 19 I Chamade (L53_)
4. 19 � Chamade (L53_)
5. 19 I (B/C53_)
6. 19 � (B/C53_)
7. 19 II Cabriolet (D53_, 853_)
8. 19 Mk II Cabriolet (D53_, 853_)
9. 21 Estate (K48_)
10. 21 Savanna (K48_)
11. CLIO I (B/C57_, 5/357_)
12. LUTECIA I (B/C57_, 5/357_)
13. RAPID Box Body/MPV (F40_, G40_)
14. EXPRESS Box Body/MPV (F40_, G40_)
15. EXTRA Van (F40_, G40_)
16. EXTRA Box Body/MPV (F40_, G40_)
17. 19 II Chamade (L53_)
18. 19 Mk II Chamade (L53_)
19. MEGANE I Coach (DA0/1_)
20. MEGANE I Coupe (DA0/1_)
21. See more in applications

The operation of the timing belt tensioner

The CAFFARO brand Tensioner, timing belt is a bearing with a pulley on the outer cage. Depending on the design, the tensioning mechanism can be made in the form of an eccentric pressed into the inner bearing race, or placed on a separate bracket. The bearing cage is packed with grease and covered with a lip. You can order an automatic tensioner, it is a little more complicated, but the roller itself has no fundamental differences.

Timing belt tension is designed for a specific force and must be consistent. Selecting a timing belt tensioner pulley that is too loose can cause the belt to slip through the timing belt teeth. This is unacceptable, since it will lead to a shift in the phases of the valve operation relative to the movement of the pistons.