How are valves adjusted (VAZ-2108) with their own hands?

Suddenly appearing noises in the engine compartment under idling and their disappearance after increasing the revolutions indicate an increase in the thermal gap between the timing joints and engine valves. It happens every 30-40 thousand kilometers. But this problem is completely solved. In this article, we will tell you how to adjust the valve clearances (VAZ-2108 will be considered as an example) with your own hands.

Difficulty adjusting

It should be noted that the device for driving the G8 engine valves differs significantly from the "classic" drive (VAZ 2105-2107). Therefore, for the first time you may experience some difficulties. On old models of "Zhiguli" for setting of backlashes it is necessary to twist a bolt and fix it with the help of a counternut. At the G8, a completely different order of valve adjustment. VAZ 2108 does not have such a system - here the gaps are exposed with the help of washers of different thicknesses. This is the main distinguishing feature of all front-wheel-drive VAZs of the "eighth" family.

How are valves adjusted (VAZ-2108 "injector") with their own hands?

Knowing these features of the work, you can begin to practice. To begin with, it is necessary to remove the valve cover and the nozzles. Further from the engine all candles are wrenched, oil is drained. So we will see all the pucks. After that, we jack up the front part of the car and scroll the front wheel. So we will combine all the marks on the camshaft pulley and the setting mark. The latter is located on the back cover of the timing belt. Then, through the inspection window on the gearbox, check whether the tags with a triangular notch on the block are aligned on the flywheel.

To make it easier to divide the pulley shaft into 4 parts, cut out a small cardboard box (8x8 centimeters). If you attach it to the end part of the gear, if you specify one angle to the factory default mark, all the others will indicate the position when adjusting. It's 90, 180 and 270 degrees. How are the valves adjusted? VAZ 2108 remains in the subdued condition, and at this time we rotate clockwise the camshaft to two or three teeth.

Clearance process

After carrying out all these operations, you can proceed to the very setting of the valve clearances. To do this, you need to make all the necessary measurements and find out which parts need adjustment. Using a special feeler, we measure the gap in the first and third valves. This tool is installed between the adjusting washer and the camshaft cam. The received data should be checked with tabulated values:

If the clearance between the adjusting washer and the camshaft cam is not correct, then this valve needs to be adjusted. We extract the washers from the saddles and record their thickness in a notepad. Next, we need a tool (adaptation), which pushes the valve pushers. We install it on the stud fastening the cover and rotate the pusher so that the slot looks at us. In parallel with this, you need to keep a record and number all the valves, as well as washers that have been installed.

How further is the VAZ-2108 valves adjusted ? Everything is simple. The valve is recessed downward, and we fix it with a clamp. It can be taken from the valve adjustment kit. Using a screwdriver or tweezers, push out the washer and measure its parameters with a micrometer. So we will make more precise adjustment.

What to do with the rest of the engine valves?

By the same principle, you need to measure all the valves, extract them, measure and write in the notepad numbered washers. After the product of all these manipulations, we calculate the size of the washer. This can be done according to the following formula. First we subtract the table value from the measured gap, then add to this number the thickness of the washer removed. As a result, we will get the thickness of the new spare parts

By this formula we count and write down all the necessary gaps, then go to the store, buy and install new washers. After that, we test the engine, wait until it heats up to 85 degrees Celsius, then wait until it cools down, and again measure the gaps. Some of them can get lost - in that case we regulate them once again. Remember that you only need to set clearances on a cooled engine.

Conclusion

At this point, the question "how the valves are adjusted correctly" can be considered closed. VAZ-2108 is a very simple car, so even such a laborious process will not cause any problems. At the same time, you will spend a minimum amount of money for maintenance.

So, we found out how the valves of the VAZ-2108 are adjusted by our own hands. By the time for this whole procedure will take about two to three hours of free time.