A JP GROUP 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. ASTRA J Sports Tourer (P10)
2. DOBLO Cargo (263_)
3. DOBLO MPV (263_)
4. DOBLO Kombi (263_)
5. DOBLO Combi (263_)
6. SEDICI (FY_)
7. GIULIETTA (940_)
8. ASTRA Mk VI (J) Estate (P10)
9. BRAVO II (198_)
10. RITMO III (198_)
11. DOBLO Box Body/MPV (223_)
12. DOBLO MONOCAB (223_)
13. INSIGNIA Mk I (A) Sports Tourer (G09)
14. BRERA (939_)
15. 156 (932_)
16. 159 (939_)
17. 159 Saloon (939_)
18. 159 Sportwagon (939_)
19. ASTRA H Estate Van (L70)
20. ASTRA H Van (L70)
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.