A SWAG 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. 4 RUNNER (_N1_)
2. SW4 (_N1_)
3. HILUX SURF (_N1_)
4. SURF (_N1_)
5. LAND CRUISER 90 (_J9_)
6. LAND CRUISER PRADO (_J9_)
7. LAND CRUISER COLORADO (_J9_)
8. MERU (_J9_)
9. 4 RUNNER (_N18_)
10. 4 RUNNER SUV (_N18_)
11. HILUX VI Pickup (_N1_)
12. TACOMA VI Pickup (_N1_)
13. HILUX MIGHTY X / HILUX TIGER VI Pickup (_N1_)
14. HILUX Platform/Chassis (LN_, _N1_)
15. HILUX SUV (_N1_, _N2_)
16. HILUX SURF SUV (_N1_, _N2_)
17. SW4 SUV (_N1_, _N2_)
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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.