Recommendation. If, when the engine is running, a loud noise from a rotating bearing is heard in the area under the front timing belt covers ("Checking the technical condition of the engine"), you should check the condition of the tension roller and replace it if necessary. This can be done without removing the belt. The roller should also be replaced during routine replacement of the timing belt ("Timing Belt - Replacement").
Timing drive with tension roller
1. Remove the front timing belt cover ("Timing Belt - Checking Condition").
Recommendation. When replacing the tension roller without removing the timing belt, there is a risk of the belt jumping over the pulley teeth, which will lead to a shift in the valve timing. Therefore, before releasing the belt tension, align the mark on the camshaft pulley with the protrusion on the rear belt cover ("Timing Belt - Replacement"). After installing the roller, the mark should not shift.
2. Loosen the tension roller mounting nut ("Timing Belt - Checking Condition") and turn it completely away.
3. Remove the roller from the pin, keeping the belt taut.
4. Install a new roller on the stud and secure it with a nut and washer, preventing the belt tension from slackening.
5. Adjust the tension of the timing belt ("Timing Belt - Checking Condition").
6. Install the front timing belt cover.
Timing belt drive with automatic tensioner
1. Prepare the car for work ("Preparing the car for maintenance and repair").
2. Remove the upper front timing belt cover ("Timing Belt - Checking Condition").
Note: After the timing belt tension is released, there is a risk of the belt jumping over the pulley teeth, which will lead to a shift in the valve timing. Therefore, before releasing the belt tension by turning the crankshaft, align the mark on the timing belt pulley with the protrusion on the rear belt cover. After installing the roller, the marks should not shift.
3. Using a 15 mm wrench, loosen the automatic tensioner mounting bolt by half a turn to loosen the timing belt tension.
4. Unscrew the tensioner mounting bolt and remove it together with the bolt.
Installation
1. Install the automatic tensioner without tightening the mounting bolt.
2. Put the timing belt on the tensioner roller, make sure the marks match and adjust the tension ("Timing Belt - Replacement").
3. Install the removed parts in the reverse order of removal.
Data obtained from the website ladaman.ru