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. C4 II (B7)
2. 508 I (8D_)
3. 508 SW I (8E_)
4. FREELANDER 2 (L359)
5. LR2 (L359)
6. LR2 SUV (L359)
7. C5 III (RD_)
8. C5 III Saloon (RD_)
9. C5 III Break (RW_)
10. PHEDRA (179_)
11. S-MAX (WA6)
12. MONDEO IV (BA7)
13. MONDEO IV Turnier (BA7)
14. ULYSSE (179_)
15. RANGE ROVER EVOQUE (L538)
16. RANGE ROVER EVOQUE SUV (L538)
17. GALAXY (WA6)
18. XF (X250)
19. XF Saloon (X250)
20. 807 (EB_)
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.