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. 323 III (BF)
2. 323 III Saloon (BF)
3. FAMILIA MK V (BF)
4. FAMILIA III (BF)
5. ETUDE III (BF)
6. 323 III Hatchback (BF)
7. ASTINA / ETUDE III Hatchback (BF)
8. FAMILIA MK V Hatchback (BF)
9. FAMILIA III Hatchback (BF)
10. ETUDE III Hatchback (BF)
11. 323 S IV (BG)
12. 323 IV Saloon (BG)
13. PROTEGE Mk VI (BG)
14. 323 S Mk IV (BG)
15. FAMILIA IV (BG)
16. 323 IV (BG)
17. 323 C IV (BG)
18. 323 C Mk IV (BG)
19. ETUDE IV (BG)
20. MX-5 I (NA)
21. See more in applications

The operation of the timing belt tensioner

The JAPANPARTS 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.