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. 18 Variable (135_)
2. 18 Break (135_)
3. 20 (127_)
4. 21 Saloon (L48_)
5. 21 (B48_)
6. 21 Estate (K48_)
7. 21 Savanna (K48_)
8. 25 (B29_)
9. FUEGO (136_)
10. ESPACE I (J11_)
11. ESPACE � (J11_)
12. TRAFIC Bus (TXW)
13. ESPACE II (J/S63_)
14. ESPACE Mk II (J/S63_)
15. CX I (MA)
16. CX � (MA)
17. CX II
18. CX I Break (MA)
19. CX � Break (MA)
20. 505 (551A)
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.