Adjusting the tension of the camshaft drive belt (VAZ-2109)

Remove the front timing belt cover and turn the crankshaft by its bolt clockwise two turns.

Check the belt tension. It is considered normal if in the middle part of the branch between the pulleys of the camshaft and crankshaft the belt is twisted by 90° with a finger force of 1.5...2 kgf (see figure 26). If the force is below the norm, then you should loosen the tension roller mounting nut, turn its axis by the hex head 10...15° counterclockwise and tighten the axis mounting nut.

Rotate the crankshaft two turns clockwise again and check the belt tension. If it is still insufficient, repeat the belt tensioning operation.

If the tension is normal, tighten the tension roller axle mounting nut to 4 kgf·m and install the front toothed belt cover. Avoid over-tensioning the belt, as this will significantly reduce its service life.

The crankshaft should be turned only in the direction of tightening the bolt (clockwise). When tensioning the belt, do not turn the crankshaft by rotating the camshaft pulley or its mounting bolt.

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The text was reviewed by the specialist: Grigory Vologodtsev

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VAZ-2109: Engine repair

Checking the condition of the camshaft drive belt
Maintenance of the valve timing mechanism
Valve timing and cylinder head
Main faults of the crank mechanism and cylinder block
Crank mechanism and cylinder block

Adjusting the clearances in the valve timing mechanism
Replacing the camshaft drive belt
Main faults of the valve timing mechanism and cylinder head