A INA 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. JUMPY (U6U_)
2. DISPATCH (U6U_)
3. JUMPY Van (BS_, BT_, BY_, BZ_)
4. DISPATCH Van (BS_, BT_, BY_, BZ_)
5. JUMPY Platform/Chassis (BU_, BV_, BW_, BX_)
6. DISPATCH Platform/Chassis (BU_, BV_, BW_, BX_)
7. SCUDO Bus (220_)
8. SCUDO Van (220_)
9. 508
10. 607 (9D, 9U)
11. 607 Saloon (9D, 9U)
12. 406 (8B)
13. 406 Saloon (8B)
14. 406 Break (8E/F)
15. 406 Estate (8E/F)
16. 406 Coupe (8C)
17. C5 I (DC_)
18. C5 I Break (DE_)
19. C5 I Estate (DE_)
20. BOXER Bus (244, Z_)
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.