A VAICO 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. COLT I (A15_A)
2. COLT I (A15_A, RA)
3. COLT � (A15_A)
4. COLT II (C1_A)
5. COLT II (C1_A, RB, RC)
6. COLT Mk II (C1_A)
7. COLT III (C5_A)
8. COLT III (C5_A, RD, RE)
9. COLT Mk III (C5_A)
10. LANCER II (A17_)
11. LANCER II Saloon (A17_)
12. LANCER � (A17_)
13. LANCER F (A15_)
14. COLT Saloon (A15_, RC)
15. COLT (A15_)
16. LANCER III (C1_A, C6_A)
17. COLT III Saloon (C1_A, C6_A, RD, RE)
18. LANCER Mk III (C1_A, C6_A)
19. LANCER III Station Wagon (C1_V, C3_V)
20. LANCER III Break (C1_V, C3_V)
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.