A SWAG 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. C-MAX II (DXA/CB7, DXA/CEU)
2. C4 II (B7)
3. 508 I (8D_)
4. 508 SW I (8E_)
5. 5008 (0U_, 0E_)
6. 5 (CW)
7. PREMACY (CW)
8. DS4 (NX_)
9. C4 PICASSO I MPV (UD_)
10. C4 GRAND PICASSO I (UA_)
11. GALAXY (WA6)
12. S-MAX (WA6)
13. MONDEO IV (BA7)
14. MONDEO IV Turnier (BA7)
15. C3 PICASSO (SH_)
16. BERLINGO MULTISPACE (B9)
17. FOCUS III Saloon
18. FOCUS III
19. FOCUS III Turnier
20. 208 I (CA_, CC_)
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.