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Tension roller: common defects and their signs

Wear of V-belt tension roller.
- The alternator doesn’t supply the car mains with electric energy.
- Excessive noise appears during alternator operation.
- The belt and the roller strongly vibrate while working.
- Displacement of the alternator belt occurred.
Mechanical damages.
- Free play appears during roller rotation.
- The alternator belt wears out unevenly.
- Belt deflection value is higher than normal.
- Rotation of the roller is troubled, screech appears.

How to replace tension roller?

Operation lifetime of the V-belt tension roller and the timing belt tension roller is almost equal and it is about 60 000 – 75 000 operational kilometers.

If any signs of defects of the alternator belt roller noted above were found, it should be replaced. Specialists recommend to perform replacement of the car V-belt roller and the timing belt tension roller simultaneously with the tensioners and the belts. It is necessary to perform component replacement at a service station, because such work requires specific knowledge and tools.

Belt drive Car parts:

Idler pulley / v belt pulley - V belt - Tensioner - Timing belt cover / crankshaft cover - Timing belt & cam belt kit - Guide pulley / deflection pulley - Serpentine belt - Freewheel clutch alternator / flexible coupling sleeve