A OPTIMAL 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. LANCER III Station Wagon (C1_V, C3_V)
5. LANCER III Break (C1_V, C3_V)
6. LANCER Mk III Station Wagon (C1_V, C3_V)
7. LANCER IV Hatchback (C6_A, C7_A)
8. LANCER IV Hatchback (C6_A, C7_A, CA, CB)
9. LANCER Mk IV Hatchback (C6_A, C7_A)
10. TREDIA (A21_)
11. GALANT III (E1_A)
12. GALANT III Saloon (E1_A)
13. SIGMA III (E1_A)
14. GALANT Mk III (E1_A)
15. ETERNA III (E1_A)
16. GALANT IV Saloon (E3_A)
17. GALANT IV Saloon (E3_A, HG, HH)
18. GALANT Mk IV Saloon (E3_A)
19. ETERNA IV Saloon (E3_A)
20. GALANT IV (E3_A)
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.