Note: The car has a timing belt (gas distribution mechanism) should be replaced every 45,000 km. During vehicle operation, it is necessary to periodically check the tension and technical condition of the timing belt. A special indicator is required to check its tension. But tension adjustment work can be performed with sufficient accuracy without it. The timing belt must be clean - without traces of dirt and oil on its surface. A timing belt with tears, cracks, delamination, cut or worn teeth, abrasions to the cord must be replaced immediately.
Warning: Timing belt adjustment should be performed on a cold engine.
To adjust the tension you will need:
- timing belt tensioner key;
- calipers;
- household steelyard.
We hook the spring balance hook onto the handle of the socket wrench extension. We secure the spring balance hook to the extension with insulating tape or scotch tape.
Checking the condition and adjusting the tension of the timing belt
1. Prepare the car for work (see "Preparing a car for maintenance and repair").
2. On the injection engine VAZ 21124 (l,6i) remove the upper part of the front cover of the timing belt (see items 3, 4 "Front Timing Belt Cover - Removal and Installation").
On the injection engine VAZ 2112 (l,5i) we remove the front cover of the gas distribution mechanism.
Note: To check the condition and tension of the timing belt on the VAZ 2112 injection engine, simply remove the plug from the front cover.
3. Remove the right mudguard of the engine compartment (see items 1-4 "Engine compartment mudguards - removal and installation").
4. Rotating the crankshaft (clockwise by the pulley bolt) using a 17 mm socket wrench, inspect the timing belt.
Warning: Oil and dirt on the timing belt will reduce its service life.
5. Check the timing belt tension in the middle part of the branch between the camshaft pulleys. Place a screwdriver with a long blade on the camshaft pulleys. Using an extension, press on the timing belt with a force of 10 kgf, measure its deflection with a caliper, which should be 5.4 mm.
Note: On a car with a 2112 engine, the timing belt deflection can be measured from the edge of the front cover (if it is not removed). First, you need to determine the distance from the edge of the lid to the belt and take this size into account when taking measurements.
If the deflection is greater than specified, tighten the timing belt; if the belt is too tight, loosen its tension.
Tension adjustment
1. Using a 17 mm wrench, loosen the tension roller mounting nut.
[The original is available on the website: VAZbook]
2. Using a special key, turn the tension roller to adjust the timing belt tension. Without releasing the tension roller, tighten its fastening nut.
Warning: Over-tensioning the timing belt will shorten its service life and may cause failure of the coolant pump bearings, tensioner pulley and idler pulley.
3. Install the removed parts on the vehicle in the reverse order of removal.