A HERTH+BUSS JAKOPARTS 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. MX-3 (EC)
2. EUNOS 30X (EC)
3. AZ-3 / PRESSO (EC)
4. 30X (EC)
5. MX-6 (GE)
6. 626 IV Hatchback (GE)
7. CAPELLA IV Hatchback (GE)
8. 626 Mk IV Hatchback (GE)
9. TELSTAR IV Hatchback (GE)
10. XEDOS 6 (CA)
11. EUNOS 500 (CA)
12. XEDOS 9 (TA)
13. MILLENIA Saloon (TA)
14. MILLENIA (TA)
15. EUNOS 800 (TA)
16. PROBE II (ECP)
17. PROBE Mk II (ECP)
18. 323 F V (BA)
19. 323 ASTINA V (BA)
20. 323 F Mk V (BA)
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.