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. SIERRA Hatchback (GBC, GBG)
2. SIERRA (GBG, GB4)
3. SCORPIO I (GAE, GGE)
4. GRANADA Mk III� (GAE, GGE)
5. GRANADA I (GAE, GGE)
6. TRANSIT Bus (V_ _)
7. TRANSIT Bus (T_ _)
8. TRANSIT Bus (E_ _)
9. SIERRA Hatchback (GBC)
10. SIERRA Turnier (BNC)
11. SIERRA Break (BNC)
12. SIERRA Turnier (BNG)
13. TRANSIT Van (T_ _)
14. TRANSIT Van (E_ _)
15. TRANSIT Van (V_ _)
16. TRANSIT Platform/Chassis (E_ _)
17. P 100 II
18. 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.