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. FIESTA III (GFJ)
2. FIESTA Mk III (GFJ)
3. ESCORT V (AAL, ABL)
4. ESCORT Mk VI (AAL, ABL)
5. ORION III (GAL)
6. VERONA III (GAL)
7. MONDEO I (GBP)
8. MONDEO � (GBP)
9. MONDEO I Saloon (GBP)
10. MONDEO � Saloon (GBP)
11. ESCORT V Turnier (ANL)
12. ESCORT NOMADE V Turnier (ANL)
13. ESCORT V Break (ANL)
14. ESCORT Mk V Turnier (ANL)
15. ESCORT V Convertible (ALL)
16. ESCORT Mk V Convertible (ALL)
17. MONDEO I Turnier (BNP)
18. MONDEO I Clipper (BNP)
19. MONDEO � Turnier (BNP)
20. MONDEO I Rural (BNP)
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.