VAZ valve adjustment (classic): work scheme

2024 Author: Erin Ralphs | [email protected]. Last modified: 2024-02-19 11:41

VAZ valve adjustment is a classic of the last century for the repair of cars of this brand. This is because such a check should be carried out regularly. The clearance system is designed in such a way that their exchange and movements are carried out at a very fast pace, as a result, they quickly fail. For most VAZ drivers, setting up such valves does not present a big problem and usually takes a little time.

It takes much longer to wait for the engine to cool down to a temperature of 20 degrees. All car enthusiasts should understand that an untimely technical inspection of a car carries a lot of unpleasant surprises in the form of breakdowns, and this is not only about the motor. Valve adjustment is mandatory for all engines that do not have hydraulic lifters.

You can explain what a hydraulic compensator is like this - with the help of it, the valves in the car's engine open with the most even gaps. This eliminates the need for regular valve adjustment, and the engine itself runs smoothly and is much quieter.

Also in our article we will look at what a rake isadjustment of VAZ valves (classic), features of setting and caring for it.

Signs that need adjustment

Before describing the process of adjusting the valves, you should understand what causes a breakdown and what signs the driver needs to know. As a rule, the main symptom of a broken timing gap is a metallic knock (at the top of the engine).

At first, the knock appears in one mode of operation, but then it goes to everything. Based on this, its size can both increase and decrease. In any case, both options will lead to a weakening of the work and power of the motor. If the gap decreases, this will lead to valve tightening and a significant drop in pressure in the cylinder, as a result, compression will drop. Increasing the gap will lead to poor exhaust gas evacuation, as it will open for a significantly shorter time than usual.

What is this setting for?

Even despite the fact that the production of VAZ cars has not been carried out for more than 9 years, the engines of this model are recognized by mechanics as very confusing in structure. How well the engine works depends on the normal operation of the car. If you are unsure whether you can adjust the valves yourself, entrust this task to an experienced mechanic.

There are a couple of holes in the head of the block. One of them for candles and two for valves. Please note that two-stroke motors do not have plugs for such holes, which significantly affects power. But it is fair to add thatthis affects gas distribution and improves engine performance. During operation, the number of such cycles is usually increased by 4 times. The combustion chamber, in turn, is closed at the time of combustion.

Thus, if even a small gap is present, the air pressure drops significantly and it escapes through the gap. If the valves are closed, then the opposite effect occurs here.

Adjustment

During setup, be sure to check the VAZ valve adjustment procedure (classic). The camshaft and crankshaft must necessarily work synchronously. Two turns of the camshaft must synchronize one of the crankshaft itself. And from where exactly the cylinders are located, the closing and opening of the valves depends. If there are problems, then when you press the gas, there are certain sounds in the form of knocks, and when the engine warms up to a certain temperature, it will start to stall.

Timing

Carry out such work according to the vehicle inspection scheme. Such an adjustment of the VAZ 21 0 7 valves (classic) should be carried out once every 25 thousand kilometers.

Do not forget that the older your car, the more often this adjustment should be carried out. This procedure is necessary for the car even after 10 thousand mileage, so you can combine business with pleasure and when changing the oil, adjust the valves for prevention.

We take these tools:

1. Ratchet key at 38.
2. 0.15mm stylus (usually sufficient).
3. 13th and 17thwrench (open-end).
4. 10th key (end).

We do everything in order

VAZ valve adjustment (classic) requires work point by point.

1. Disconnect the battery from the on-board network.
2. Put in neutral and put something under the rear wheel.
3. Make sure the motor is cold (20 degrees minimum).
4. Unscrew all fasteners with a wrench by 10.
5. Remove the cylinder head cover.
6. Setting pattern starts from number 0.
7. The main valve cover has an arrow pointing to the camshaft mark.
8. There is a table on the handle, following it, set the 6th and 8th gap (calculation lead from the radiator).
9. Turn the crankshaft halfway, then adjust the 4th and 7th gaps.
10. Turn another half turn, then adjust 1st and 3rd.
11. Leave the 5th and 2nd gap to the very end.

Conclusion

Do-it-yourself valve adjustment on a VAZ (classic) can be done quickly and easily. But it is worth fully considering that for maximum accuracy, after the first adjustment of the valves, recheck their operation. It is important that when the nuts are tightened, the gap should not become smaller, and the valve cannot be completely clamped. The movement of the probe must be smooth and without obstacles. After the work done, you need to turn the crankshaft with a feeler gauge, and then check the gaps again.

We remind you that this tuning scheme is suitable for all VAZ models. But for 100% of the result before adjusting the valves, conduct a technical inspection of your car and make sure that the problem comes from the valves. Experts advise not to carry out maintenance on your own, but to contact a service station. Adjusting the VAZ valves (classic) still requires some skills from the person doing the work.