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. 508 I (8D_)
2. 508 SW I (8E_)
3. MONDEO IV Turnier (BA7)
4. MONDEO IV (BA7)
5. GALAXY (WA6)
6. S-MAX (WA6)
7. EXPERT TEPEE (VF3X_)
8. FOCUS II Turnier (DA_, FFS, DS)
9. FOCUS II Station Wagon (DA_, FFS, DS)
10. FOCUS II (DA_, HCP, DP)
11. FOCUS C-MAX (DM2)
12. C-MAX (DM2)
13. SCUDO Bus (270_, 272_)
14. SCUDO MPV (270_, 272_)
15. SCUDO Van (270_, 272_)
16. FOCUS Hatchback (LV)
17. 307 (3A/C)
18. 407 (6D_)
19. 407 Saloon (6D_)
20. S40 II (544)
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.