A HERTH+BUSS JAKOPARTS 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. LAUREL (JC32)
2. PATROL III/2 Station Wagon (W260)
3. SAFARI III/2 Station Wagon (W260)
4. PATROL GR IV (Y60, GR)
5. PATROL IV (Y60, GR, GQ)
6. PATROL GR � (Y60, GR)
7. SAFARI IV (Y60, GR)
8. PATROL GR IV (Y60, GR, 260L)
9. PATROL GR V Wagon (Y61)
10. PATROL IV Station Wagon (Y61, GR_, GU)
11. PATROL GR Mk II Wagon (Y61)
12. SAFARI V Wagon (Y61)
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.