Tensioner Pulley, timing belt - 531 0121 20 INA

A INA 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. COLT III (C5_A)
2. COLT III (C5_A, RD, RE)
3. COLT Mk III (C5_A)
4. LANCER IV Hatchback (C6_A, C7_A)
5. LANCER IV Hatchback (C6_A, C7_A, CA, CB)
6. LANCER Mk IV Hatchback (C6_A, C7_A)
7. GALANT IV Saloon (E3_A)
8. GALANT IV Saloon (E3_A, HG, HH)
9. GALANT Mk IV Saloon (E3_A)
10. ETERNA IV Saloon (E3_A)
11. GALANT IV (E3_A)
12. GALANT IV (E3_A, HG, HH)
13. GALANT Mk IV (E3_A)
14. ETERNA IV (E3_A)
15. L 300 III Van (P0_V, P1_V, P_2V)
16. EXPRESS III Van (SF, SG, SH, SJ, WA, P0_V, P1_V, P_2V)
17. DELICA III Van (P0_V, P1_V, P_2V)
18. L 300 III Bus (P0_W, P1_W, P2_W, P3_W)
19. STARWAGON III Bus (P0_W, P1_W, P2_W, SD, SE, SF, SG, SH, SJ,
20. DELICA III Bus (P0_W, P1_W, P2_W, P3_W)
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.