A SNR 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. CHEROKEE (XJ)
2. WAGONEER (XJ)
3. CHEROKEE SUV (XJ)
4. VOYAGER / GRAND VOYAGER III (GS)
5. TOWN & COUNTRY III (GS)
6. TACUMA Mk II (GS)
7. CARAVAN III (GS)
8. VOYAGER IV (RG, RS)
9. TOWN & COUNTRY IV (RG, RS)
10. VOYAGER Mk III (RG, RS)
11. GRAND VOYAGER IV (RG, RS)
12. CHEROKEE (KJ)
13. LIBERTY SUV (KJ)
14. LIBERTY (KJ)
15. CHEROKEE / LIBERTY (KJ)
16. 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.