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. LT 28-35 I Bus (281-363)
2. LT28-50 � Bus (281-363)
3. LT 28-35 I Van (281-363)
4. LT28-50 � Van (281-363)
5. LT 28-35 I Platform/Chassis (281-363)
6. LT28-50 � Platform/Chassis (281-363)
7. LT 40-55 I Van (291-512)
8. LT 40-55 I Platform/Chassis (293-909)
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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.