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. HIACE III Bus (_H5_, _H6_, _H7_, _H8_, _H9_)
2. LAND CRUISER (_J7_)
3. CAREVACA (_J7_)
4. LAND CRUISER PRADO (_J7_)
5. CRESSIDA Saloon (_X6_)
6. CRESSIDA Saloon (MX62, _X6_)
7. CRESSIDA Station Wagon (_X6_)
8. HIACE III Van (_H5_, _H6_, _H7_, _H8_, _H9_)
9. HIACE II Van (_H11, _H2_, _H3_, _H4_)
10. DYNA Platform/Chassis (_U_, _Y_)
11. DYNA Bus (_U3_, _U2_)
12. HILUX IV Pickup (_N5_, _N6_)
13. 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.