Deflection, guide, drive or idler pulleys are devices that ensure that the V-ribbed belt runs in the best direction and along the optimal path. This means that the belt wraps around the drive pulleys with the greatest possible angle, which means it can transmit more power with a smaller width and tension. The timing belt in a modern vehicle uses several nodes at once. To guide the belt along the most correct contour, guide pulleys are used. Their use helps the belts to wrap around the drive pulleys as much as possible and achieve a good effect with less tension and belt width.

1. ROADMASTER Estate
2. MUSTANG Coupe (C)
3. MUSTANG Convertible (C)
4. TAURUS (P5_)
5. TAURUS Wagon (P5_)
6. CORVETTE
7. BLAZER S10
8. BLAZER S10 SUV
9. STS
10. CORVETTE Convertible
11. CAMARO
12. CAMARO Convertible
13. MARK VIII Coupe
14. ALERO
15. ALERO Saloon
16. LESABRE
17. LESABRE Saloon
18. HUMMER H1
19. SEVILLE
20. SEVILLE Saloon
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The functionality of the deflection pulley

The GATES brand Deflection/Guide Pulley, v-ribbed belt is fixed and has an offset center. This design makes it possible to effectively adjust the position of the belt drive during the rotation of the tensioner. In this case, premature wear or rupture of the belt, as well as bending of the valves, is excluded, which can cause damage to the gas distribution system and the engine.

The reasons why the deflection pulley fails can be associated with its contamination, excessive or weak tension, as well as the displacement of the timing belt. Debris between the belt and the pulley can damage the outer ring or sidewall guide.