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. LAND CRUISER (_J7_)
2. CAREVACA (_J7_)
3. LAND CRUISER PRADO (_J7_)
4. CRESSIDA Saloon (_X6_)
5. CRESSIDA Saloon (MX62, _X6_)
6. CRESSIDA Station Wagon (_X6_)
7. HIACE III Bus (_H5_, _H6_, _H7_, _H8_, _H9_)
8. HIACE III Van (_H5_, _H6_, _H7_, _H8_, _H9_)
9. HILUX V Pickup (_N_, KZN1_, VZN1_)
10. PICKUP V Pickup (_N_, KZN1_, VZN1_)
11. TACOMA V Pickup (_N_, KZN1_, VZN1_)
12. HILUX MIGHTY X V Pickup (_N_, KZN1_, VZN1_)
13. CRESSIDA Saloon (_X7_)
14. HILUX IV Pickup (_N5_, _N6_)
15. HIACE II Bus (_H11, _H2_, _H3_, _H4_)
16. HIACE II Pickup (_H11, _H2_, _H3_, _H4_)
17. DYNA 100 Platform/Chassis (LY1_, YY1_)
18. DYNA Platform/Chassis (LH8_)
19. 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.