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. LAND CRUISER PRADO (_J15_)
2. LAND CRUISER (_J7_)
3. CAREVACA (_J7_)
4. LAND CRUISER PRADO (_J7_)
5. LAND CRUISER Hardtop (_J7_)
6. LAND CRUISER FRP Top (_J7_)
7. 4 RUNNER (_N1_)
8. SW4 (_N1_)
9. HILUX SURF (_N1_)
10. SURF (_N1_)
11. LAND CRUISER 90 (_J9_)
12. LAND CRUISER PRADO (_J9_)
13. LAND CRUISER COLORADO (_J9_)
14. MERU (_J9_)
15. DYNA Platform/Chassis (KD_, LY_, _Y2_, _U3_, _U4_)
16. HIACE IV Bus (__H1_, __H2_)
17. HILUX VI Pickup (_N1_)
18. TACOMA VI Pickup (_N1_)
19. HILUX MIGHTY X / HILUX TIGER VI Pickup (_N1_)
20. HIACE IV Van (__H1_, __H2_)
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.