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. 323 S IV (BG)
2. 323 IV Saloon (BG)
3. PROTEGE Mk VI (BG)
4. 323 S Mk IV (BG)
5. FAMILIA IV (BG)
6. 323 IV (BG)
7. 323 C IV (BG)
8. 323 C Mk IV (BG)
9. ETUDE IV (BG)
10. 323 F IV (BG)
11. 323 ASTINA IV (BG)
12. 323 F Mk IV (BG)
13. ASTINA IV (BG)
14. FAMILIA / ASTINA IV (BG)
15. MX-5 I (NA)
16. MX-5 � (NA)
17. MX-5 / ROADSTER I (NA)
18. MX-5 / MIATA I (NA)
19. MIATA I (NA)
20. MX-3 (EC)
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.