A OPTIMAL 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. GS
2. GS Break
3. CX II
4. CX I (MA)
5. CX � (MA)
6. CX I Break (MA)
7. CX � Break (MA)
8. CX II Break
9. CX Mk II Break
10. C25 Bus (280_, 290_)
11. J5 Bus (280P)
12. J5 Platform/Chassis (280L)
13. J5 Bus (290P)
14. PANDA (141_)
15. PANDA Hatchback Van (141_)
16. TIPO (160_)
17. UNO (146_)
18. Y10 (156_)
19. DEDRA (835_)
20. DELTA II (836_)
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.