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. COLT II (C1_A)
2. COLT II (C1_A, RB, RC)
3. COLT Mk II (C1_A)
4. COLT III (C5_A)
5. COLT III (C5_A, RD, RE)
6. COLT Mk III (C5_A)
7. LANCER III (C1_A, C6_A)
8. COLT III Saloon (C1_A, C6_A, RD, RE)
9. LANCER Mk III (C1_A, C6_A)
10. LANCER III Station Wagon (C1_V, C3_V)
11. LANCER III Break (C1_V, C3_V)
12. LANCER Mk III Station Wagon (C1_V, C3_V)
13. LANCER IV (C6_A, C7_A)
14. LANCER IV (C6_A, C7_A, CA, CB)
15. LANCER Mk IV (C6_A, C7_A)
16. LANCER IV Hatchback (C6_A, C7_A)
17. LANCER IV Hatchback (C6_A, C7_A, CA, CB)
18. LANCER Mk IV Hatchback (C6_A, C7_A)
19. LANTRA I (J-1)
20. LANTRA I Saloon (J-1)
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.