A DAYCO 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. 323 F VI (BJ)
2. 323 ASTINA VI (BJ)
3. PROTEGE5 VI (BJ)
4. FAMILIA VI (BJ)
5. 323 F/P Mk VI (BJ)
6. ETUDE VI (BJ)
7. PREMACY (CP)
8. 6 Hatchback (GG)
9. ATENZA Hatchback (GG)
10. MPV II (LW)
11. MPV Mk II (LW)
12. 6 Station Wagon (GY)
13. ATENZA Station Wagon (GY)
14. 6 Saloon (GG)
15. ATENZA Saloon (GG)
16. 323 S VI (BJ)
17. 323 PROTEGE VI (BJ)
18. PROTEGE VI (BJ)
19. ALLEGRO MK VIII (BJ)
20. 323 S Mk VI (BJ)
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.