A GATES 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. LAGUNA I (B56_, 556_)
2. LAGUNA I Grandtour (K56_)
3. LAGUNA I Nevada (K56_)
4. LAGUNA I Estate (K56_)
5. S40 I (644)
6. S40 I Saloon (644)
7. V40 Estate (645)
8. SAFRANE II (B54_)
9. SAFRANE Mk II (B54_)
10. S70 (874)
11. S70 Saloon (874)
12. V70 I (875, 876)
13. V70 � (875, 876)
14. C70 I Coupe (872)
15. S80 I (184)
16. S80 I Saloon (184)
17. C70 I Convertible (873)
18. V70 II (285)
19. V70 Mk II (285)
20. S60 I (384)
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.