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. GALANT II (A16_)
2. GALANT II Saloon (A16_)
3. GALANT Mk II (A16_)
4. PAJERO I Canvas Top (L04_G)
5. MONTERO � Canvas Top (L04_G)
6. PAJERO/SHOGUN Mk II Canvas Top (L04_G)
7. PAJERO/SHOGUN I Canvas Top (L04_G)
8. PAJERO I (L04_G, L14_G)
9. PAJERO I (L04_G, L14_G, NA, NB, NC, ND, NE, NF, NG)
10. MONTERO � (L04_G, L14_G)
11. PAJERO/SHOGUN � (L04_G, L14_G)
12. PAJERO/SHOGUN I (L04_G, L14_G)
13. L 300 / DELICA II Bus (LO3_P/G, L0_2P)
14. EXPRESS II Bus (LO3_P/G, L0_2P, SA, SB, SC, SD, SE)
15. DELICA II Bus (LO3_P/G, L0_2P)
16. L 300 III Van (P0_V, P1_V, P_2V)
17. EXPRESS III Van (SF, SG, SH, SJ, WA, P0_V, P1_V, P_2V)
18. DELICA III Van (P0_V, P1_V, P_2V)
19. L 300 III Bus (P0_W, P1_W, P2_W, P3_W)
20. STARWAGON III Bus (P0_W, P1_W, P2_W, SD, SE, SF, SG, SH, SJ,
21. 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.