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. MEGANE II Estate (KM0/1_)
2. MEGANE II Grandtour (KM0/1_)
3. MEGANE II Sport Tourer (KM0/1_)
4. LAGUNA II (BG0/1_)
5. LAGUNA II Grandtour (KG0/1_)
6. LAGUNA II Sport Tourer (KG0/1_)
7. MEGANE II (BM0/1_, CM0/1_)
8. SCENIC II (JM0/1_)
9. PRIMERA (P12)
10. PRIMERA Hatchback (P12)
11. PRIMERA Estate (WP12)
12. PRIMERA Traveller (WP12)
13. MEGANE II Coupe-Cabriolet (EM0/1_)
14. MEGANE II Saloon (LM0/1_)
15. GRAND SCENIC II (JM0/1_)
16. GRAND VITARA II (JT, TE, TD)
17. GRAND VITARA XL-7 II (JT, TE, TD)
18. GRAND ESCUDO II (JT, TE, TD)
19. GRAND VITARA II SUV (JT, TE, TD)
20. GRAND NOMADE / GRAND VITARA II (JT, TE, TD)
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.