Valve adjustment: what is it for and what does it give. Determining the parameters of the transient response By the type of transient response, you can determine the dynamic properties of the object: K, Khust,? d, T, R

The valve is...

A control valve is a fitting used to regulate the pressure and fuel consumption in a car. There are many types of this fitting.

So, the car has two valves on one cylinder (sometimes more). And one of them releases exhaust gases (exhaust and intake), and the other starts the combustible mixture. The mechanism that sets the valves in motion is called gas distribution (another name is valve). After the engine is heated, its parts expand. It follows from this that on a cold engine between certain details there must be gaps, and strict. So, if something rattled in the engine, incomprehensible extraneous sounds, then it's worth checking - maybe it's time to repair the valves?

gaps

Valve adjustment is a very important process. If it is of poor quality, then malfunctions may occur due to this, which will lead to a poor result - just the efficiency of the engine will decrease significantly. Even the resources of its parts will become less. Small gaps can cause valve seats to burn and burn. If they are large, then even worse - the engine will have low performance.

It is advisable to check every 20 thousand kilometers, if necessary, it will be necessary to carry out a process such as valve adjustment.

Dealing with gaps

First you need to check if the engine is cold. Only then can the valves be adjusted. First you need to set the cylinder piston to the compression dead center, which must be adjusted in advance. It is in this position that the valves are closed. Then you need to release the locknut on the adjusting bolt or screw. Then, using the adjusting bolt, you need to adjust well

gap and tighten the nut. The clearance after the locknut is tightened may change. That is why you should be extremely careful when performing this operation. If the flat probe passes into it with some effort, then everything is set up correctly. If it is too heavy or easy, it is worth adjusting it more precisely.

This topic is also worth touching on. If the pushrods are damaged, it becomes difficult for the driver to start the engine. If this is not corrected in time, then the valve heads will simply burn. Or, as the worst outcome, they can simply be broken. To correct this, you need to set the camshaft in such a position that the exhaust valve is fully opened, and set the gaps in the remaining valves. To adjust them, you need to loosen the locknut of the pusher bolt. And then tighten the adjusting bolt so as to obtain the desired clearance on the probe. This is what the valve adjustment looks like. The main thing is not to make a mistake in this painstaking process (however, as in any other that concerns the breakdown automotive parts) so that you do not have to completely replace already defective parts.

5 years ago

Welcome!
Valve adjustment - most people, of course, know what this process is and why it needs to be done regularly on some cars, for example, on the Classic, but there are people who don’t know anything about it and want to understand this issue, therefore, especially for such people this article was prepared from which you will learn a lot. And if something becomes unclear to you, then in this case, write a comment with your question at the very bottom of the site and we will answer it as soon as possible.

Note!
And in addition, at the end of the article, an interesting video clip awaits you, thanks to which you will understand a lot for yourself in adjusting the valve drive!

Why do you need to adjust the valves?

Their adjustment is necessary in order for the machine to work more stably both at high and at low revs engine. Because, as a rule, due to incorrect adjustment of the valves, the gaps that should be between the camshaft cam and the valve itself are violated, which leads to too much opening of the valve during engine operation and, as a result, depressurization will occur in the cylinder, which in turn can adversely affect the engine life .

Note!
In the event that the gap between the valve seat and the side particles of the cylinder has become very large (see photo below, this gap is marked there), then in this case the valve may burn out, and also if the piston stroke is very large, then meeting of valves with the piston itself during engine operation. Therefore, the valves must be adjusted periodically and with great care, since incorrectly set gaps during adjustment can again adversely affect the motor resource!

How will the valves work if the clearance is incorrectly set?

In this case, as mentioned earlier, the operation of the valves is disrupted, in connection with this, the valves either begin to open a little more than expected, or they begin to be in a constantly open position, due to which the sealing in the cylinder disappears, for clarity, look at the photo below on which the valve adjustment is violated and in connection with which the valve is in a permanently open mode.

How to get rid of valve adjustment?

Have you ever asked yourself: “Why, for example, on a 16-valve prior, do you not need to adjust the valves?” And the thing is that in the engine, the priors instead of the "Pusher" due to which the cam camshaft pushes the valve, there are “Hydro-compensators”, which, in turn, due to the high oil pressure, find the optimal gap between the cam and the “Hydro-compensator” of the valve itself, and in connection with this, the valves always work at optimal clearances.

Note!
By the way, "Hydro-compensators" can be installed on almost any car, and therefore you can forget about valve adjustment, but there is one But! "Hydro-compensators" can only be installed on cars in which the "Gas Distribution Mechanism - aka Timing" consists of a camshaft, crankshaft, as well as valves and piston group- in fact, this is the main part of the car!

The alignment procedure is performed to eliminate and prevent the occurrence of problems with handling vehicle. If the wheels are set incorrectly, the car will react less to the movement of the steering wheel, it will be difficult to enter turns, and there will be a problem of rapid tire wear (in some cases, the wear threshold can be 500 km). Currently, wheel alignment is adjusted only at specialized service stations. Contrary to the opinion of some car owners, such a procedure cannot be performed at home.

What is wheel alignment?

Camber - the angle of deviation of the wheels along the vertical axis. Positive camber occurs when the angle formed by the upper parts of the wheels is greater than the lower ones. This camber is used on trucks moving in a loaded state, which compensates for the difference in angles. Negative camber occurs when the angle of the upper parts of the wheels is less than the lower ones. This camber is used to stabilize the car when cornering at high speeds. The most preferred zero camber, in which the angles of the upper and lower parts of the wheels are the same. This camber provides city car handling and reduces tire wear. Wheel alignment is also positive and negative. With positive convergence, the front parts of the wheels are at a distance less than the rear ones. With a negative - on the contrary, the rear parts of the wheels are closer. Proper toe adjustment is extremely important, as an incorrectly set toe can increase tire wear several times over.

Signs of an incorrectly set wheel alignment:

Despite the fact that the wheel alignment is regulated only on professional equipment in the service station, you can independently diagnose the correctness of its adjustment. Below are a few signs that indicate the need for a wheel alignment adjustment:

• screeching sound when cornering at high speed
• the car moves in a straight line only after the steering wheel is tilted to the side
• without fixing the steering wheel, the car pulls to the side
• fast tire wear

When should wheel alignment be done?

There are a number repair work, after which the adjustment of the wheel alignment is required without fail:

• after installing a new ball joint
• when replacing the steering rack or steering end
• after replacing and installing a new CV joint

For camber adjustment, we recommend that you use only high-quality spare parts that you can find in the IXORA store. Qualified managers will definitely help to make right choice will answer all your questions. Contact us, it's profitable and convenient.

The engine is the most important part of the car, on which the operation of the car is completely based. That is why it is important to monitor the condition of the engine, carry out diagnostics, and also change it in a timely manner. Consumables. Valves can be the cause of many problems in a car (for example, knocking, power loss). Therefore, it is important to know how to properly adjust the valves.

valves in cars

Each car has either 8 or 16 valves. Their number depends on the number of cylinders - either one valve per cylinder, or two. The first is responsible for launching the combustible mixture into the combustion chamber, the second is responsible for opening the outlet for the exhaust gases to exit. Such a mechanism that regulates the distribution of the mixture and gases is called gas distribution or valve. It is worth noting that different systems are installed on a diesel engine and an injector.
When the motor heats up, the metal expands. Thus, there must be gaps on the engine that have a fixed size. The consequences of incorrectly adjusted valves include reduced engine efficiency, as well as rapid wear of parts.

For example: if the gap is insufficient, the valve will burn, if the gap is too large, the valve will not fully open and make a metallic knock.
How often should the valves be adjusted?
If you change the size of the gaps, you need to adjust them.

Signs of improper valve adjustment

There are a lot of signs that the gaps have been violated. First of all, the engine power and efficiency of its work are reduced. An unpleasant metallic knock, noise, burning smell, etc. may occur. Knock appears mainly under loads or on Idling. As a result, engine parts are subject to rapid wear.
The above signs of misadjusted valves are an alarming symptom. If at least one of them appears, it is necessary to check the valves and adjust them.

valve adjustment result

Valve adjustment: what is it for?

Ultimately at correct adjustment valves, the stability of the motor is restored, power and wear resistance increase. The engine will run smoother and more stable at both low and high speeds.

Can the valves be adjusted?

V modern cars so-called hydraulic compensators are installed. V conventional engines there are camshaft cams or “pushers” that push the valve. As for the hydraulic compensators, they themselves find the necessary clearance for the release of gases when high pressure oils. They ensure optimal valve performance in all cases. Many people ask: “If you don’t adjust the valves, what will happen?” If the car has hydraulic lifters, then valve adjustment is not necessary. Otherwise, the valves should be adjusted and checked periodically.

How to adjust valves?

How to properly adjust valve clearances

Many car owners try to adjust the valves themselves without contacting technical service.
It is necessary to set the dimensions of the gaps on the engine in a cold state, since the factory settings were made on cold metal. In this case, it does not change its dimensions, and they remain standard.
It is worth noting that it is worth adjusting the valves exactly according to the recommendations and instructions, otherwise the gaps will be set incorrectly.
First, the cylinder piston is set to the dead center of the compression stroke at the top. The cylinder clearance will be determined with a feeler gauge. This will ensure that both valves close and that the rocker arm swings within the specified clearance limits. Manufacturers usually put marks on which you can install the piston in this position.
The adjustment itself is made by turning the screws of the rocker arms in the right direction. Turn the crankshaft asterisk only clockwise. Many apply their marks to determine the position of each of the cylinders. The marks must match on the bearing and crankshaft.
Next, you need to release the locknut on the bolt or screw. The gap must be set to the limit, in this case, which is the probe. Then it is necessary to fix the position by tightening the nut. This should be done carefully, taking into account the tightening force, since the established gap can be knocked down. To check the gap, you need to insert the probe, it should pass, but with effort. If the probe does not pass, you need to repeat the adjustment.

It is necessary to adjust the valves one by one in the order in which the cylinders in the car work, and with the utmost care.

The crankshaft is rotated only by the starting handle (crooked starter handle), or by the screw securing the generator drive pulley, and only clockwise.
Here you definitely need a probe or a special tool for adjusting the valves.
In special books on engine repair, the adjustment procedure is fully described. Another feature is the setting of the gap on the intake and exhaust valves. The boost pressure control valve has a clearance different from the exhaust. In addition, different clearances may be required for different cylinders. All this is described in the car repair manual.

Required Tools

What you need to adjust the valves

As mentioned earlier, a probe or special tool is required. If you choose the right one, you can work with adjustment plates. A rail is often used to adjust valves, which provides greater accuracy than plates or a feeler gauge. However, the adjustment process itself is different, it does not correspond to the above method.
You can use an indicator. It is a special device for adjusting valves with high precision.

Thus, the valves are responsible for the distribution of the combustible mixture in the engine, the timely release of exhaust gases. Valve clearances should be monitored regularly and adjusted if necessary. You can adjust the valves yourself, without resorting to the services of car services. It is important to accurately measure valve clearances, as they ensure the stability and efficiency of the engine.