The timing belt tensioner is a load-bearing pulley located on an adjustable axle. Its main function is belt tension; additional functions are to damp drive vibrations and increase the angle of the camshaft pulley wrap.

1. 850 (854)
2. 850 Estate (855)
3. 850 Rural (855)
4. S40 I (644)
5. S40 I Saloon (644)
6. V40 Estate (645)
7. S70 (874)
8. S70 Saloon (874)
9. V70 I (875, 876)
10. V70 � (875, 876)
11. XC70 CROSS COUNTRY (295)
12. XC70 CROSS COUNTRY Estate (295)
13. XC70 CROSS COUNTRY SUV (295)
14. V70 XC (295)
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The operation of the timing belt tensioner

The SWAG brand Tensioner, timing belt is a bearing with a pulley on the outer cage. Depending on the design, the tensioning mechanism can be made in the form of an eccentric pressed into the inner bearing race, or placed on a separate bracket. The bearing cage is packed with grease and covered with a lip. You can order an automatic tensioner, it is a little more complicated, but the roller itself has no fundamental differences.

Timing belt tension is designed for a specific force and must be consistent. Selecting a timing belt tensioner pulley that is too loose can cause the belt to slip through the timing belt teeth. This is unacceptable, since it will lead to a shift in the phases of the valve operation relative to the movement of the pistons.