The hydraulic compensator or, as it is also called, the hydraulic valve tappet is a hydromechanical device capable of changing its length. It must compensate for the thermal gap between the valves and the camshaft and is the main component for automatic valve adjustment.
The hydraulic compensator includes an external cylinder and a movable interiorwhich is repelled by the spring. In the cavity of the hydraulic compensator, at the inlet, there is a valve consisting of a ball pressed by a spring. What helps the hydraulic valve lifter to change its length?
The principle of its operation is to increase the length due to the spring inside, which is able to bring the uncompressed valve tappet to the state of maximum length. When the inner part is extended, the filling of the hydraulic compensator cavity with what was around begins through the valve.
If you hold the hydraulic pusher in your hands, it will be filled with air, and if it is mounted on the engine, it will be filled with oil. The compression process of the hydraulic valve tappet is somewhat more complicated, since the valve practically does not allow oil back through. A small amount of oil still comes out through small distances between the rubbing surfaces. When the working pusher is compressed, you will not see the oil exit.
The hydraulic compensator is installed so that the outlet is directed upwards, it will serve as a support for the rocker arm or, as they say, a rocker, which will cover the outlet. A hole is provided in the rocker arm, through which oil must come out of the hydraulic pusher and is fed to the rocker bearing by a jet, this is how it is lubricated. The principle of operation of a hydraulic valve tappet is simple, everything will depend on how hard the pressure is applied, it is able to pick up oil through the intake valve or squeeze it out through tiny gaps.
If the hydraulic valve tappet is in good working order, it will hold pressure perfectly when filled with oil. When the hydraulic lifter is removed, it is easy to check, when you try to compress it, you will not succeed, if even the minimum compression succeeded, then such a pusher requires replacement.
But if we assume that air has entered the pusher, then the compression, quite possibly, to check it will need to be filled with oil and try to compress it again. If one of the hydraulic lifters fails, then the best solution will replace all pushers, because their service life is approximately the same and the remaining ones will not last long.
It is possible to recognize the failure of the hydraulic compensator, the main symptom of their malfunction will be the appearance of a ringing knock in the engine, first on an unheated, cold engine, and over time on a warm one.
Sometimes, valve noise can be eliminated. To do this, you will need to slightly turn the spring or valve around the longitudinal axis.
- Rotate the crankshaft so that the noisy valve starts to open slightly.
- Unfold the spring slightly, and the valve will unfold with it.
- Start the engine and listen. If the noise remains, then the operation should be repeated with the valve and spring.
- If it is impossible to eliminate the noise by turning the valve and the spring, then it is worth checking the condition of the latter. This measures the gaps between the valve guide sleeve and valve stem and then removes it if necessary.
- If the clearances are within normal limits and the valve with the spring is in good condition, and when the engine is running, you still hear the knock of the valves, then the hydraulic valve tappets will have to be replaced.
How to independently replace engine hydraulic lifters on Hyundai Accent?
It is not necessary to remove the cylinder head from the engine to replace the hydraulic valve lifters. For replacement, it is sufficient to remove the camshaft housing. Remember, when removing the housing, the head gasket will have to be replaced with a new one to avoid a leaky connection when tightening the bolts.
Preparatory work
Fill a new hydraulic compensator with oil. To do this, you need to completely lower the pusher in a container with oil and squeeze it there several times. In this case, bubbles will rise, coming out of the central hole, you need to squeeze until the bubbles stop. After the hydraulic lifter is completely filled with oil, you can start installing it on the engine.
Replacing hydraulic pushers on a car Hyundai accent
- Unscrew and remove the cover from the cylinder head.
- Remove the rocker arm, cracker that is located on the valve stem and the camshaft.
- Pull the hydraulic valve tappet out of its seat in the cylinder head.
- Lubricate the engine socket with oil and take the previously prepared new hydraulic compensator. Install it in the socket.
- By analogy, replace all remaining hydraulic lifters.
- Reinstall the camshaft and other removed parts in reverse order.
Before starting work on replacing hydraulic lifters, you must wait until the engine has cooled down, it will take about half an hour, but it is required in order to reduce the oil pressure in the hydraulic valve lifters.
The hydraulic valve tappet is located inside the cylinder head seat with minimal interference and can be easily removed without assistance special tools... But it will be most convenient to use a rubber suction cup.
When the hydraulic lifters are replaced and the engine is started for the first time, it is possible that for some time there will be increased noise during operation, but do not worry. The hydraulic lifters are fully pumped out and all extraneous noise will stop.
For a person who is more or less experienced or who understands mechanics, it will not be difficult to replace the hydraulic lifters with a Hyundai Accent manually in the garage. This will require standard tools and a little time.
We will briefly describe all the replacement steps:
1. The first thing you need is to remove the cover from the timing belt, something like this should remain after this step:
2. Now you have to find a red dot on the head of the block, which you need to take as a reference point and fit the timing belt pulley exactly under it (round hole). If it does not work, then you will have to slightly raise the right wheel and turn it until the points are aligned. 
3. We advise you to fix the belt and pulley with something, you can quite conveniently do this with ordinary clamps. In addition, it is better to draw marks on the stars and on the chain, which will have to be removed. PS. it is possible not to remove the chain from the belt pulley star. 
4. Now you can already remove all hydraulic lifters, the last 4 will be difficult, these are the ones that are at the timing belt pulley, you will have to play with raising the camshaft. The main thing is to tighten the clamps well in the previous step.
In addition, you need to warn you about the well-known 24 bolts that are tightened after installing new hydraulic compensators. Officially, they need to be twisted with a force of 12-14 Nm, but in fact, we had 2 bolts tore off, it was very difficult to pull them back out. Use a proven and good torque wrench.
2017-03-06T23: 10: 45 + 00: 00 adminAccent For a person who is more or less experienced or who understands mechanics, it will not be difficult to replace the hydraulic lifters with a Hyundai Accent manually in the garage. This will require standard tools and a little time. We will briefly describe all the steps for replacing: 1. The first thing you need is to remove the cover from the timing belt, something like this should remain ...adminHydraulic compensators of the DOHC engine, made in the form of cylindrical pushers located between the camshaft and the valves, combine two functions: transferring force from the camshaft to the valves and eliminating gaps in their drive.
The work of the hydraulic compensator is based on the principle of incompressibility engine oil, which constantly fills the internal cavity of the hydraulic compensator during engine operation and moves its plunger when a gap appears in the valve drive. This ensures that the tappet (valve actuator lever) is in constant contact with the cam. camshaft no clearance. This eliminates the need to adjust the valves when maintenance... The principle of operation of the hydraulic compensator is shown in fig. 4.11 ... Oil under pressure necessary for the operation of the hydraulic compensator is supplied to its internal cavities A and B from channel C of the engine lubrication system through a side hole in the pusher 6, made in the annular groove of its cylindrical surface. When the valve 1 is closed, the pusher 6 (through the plunger 7) and the sleeve 9 are pressed by the expanding force of the springs 8, respectively, to the cam 5 of the camshaft and the end of the valve stem. The pressure in cavities A and B is the same, the check valve 3 of the hydraulic compensator is pressed against the seat in the plunger 7 by spring 2. There are no gaps in the valve mechanism. When the camshaft rotates, the cam 5 runs onto the pusher 6, moving it and the plunger 7 associated with it. The movement of the plunger 7 in the sleeve 9 leads to a sharp increase in pressure in the cavity B. Despite small oil leaks through the gap between the plunger and the sleeve, the pusher 6 and sleeve 9 moves in one piece and opens valve 1. With further rotation of the camshaft, cam 5 reduces the pressure on the pusher 6 and the oil pressure in cavity B becomes lower than in cavity A. Check valve 3 opens and passes oil from cavity A connected to the engine oil line, into the cavity B. The pressure in the cavity B increases, the sleeve 9 and the plunger 7, moving relative to each other, choose a clearance in the valve mechanism.
The pressure of the oil supplied to the hydraulic lifters is regulated by a special valve installed in the cylinder head. Since after stopping the engine from the channels coming from the oil pump, oil flows into the oil sump, and the channels for supplying oil to the hydraulic lifters remain full, after starting the engine, air locks may form in the cavities of the latter. To eliminate them, calibrated compensation holes are provided in the engine oil supply channels, which provide automatic blowing of the hydraulic compensator cavities. In addition, the expansion holes allow to slightly reduce the pressure of the oil entering the hydraulic lifters at a high speed crankshaft engine, when the pressure in the cavity of the hydraulic compensator can become so great that its pusher, leaning on the back of the camshaft cam, will slightly open the valve at a moment that does not correspond to the valve timing.
Almost all malfunctions of hydraulic compensators are diagnosed by the characteristic noise emitted by the gas distribution mechanism in various engine operating modes.
Valve noise can sometimes be eliminated by slightly turning the spring or valve around the longitudinal axis. To do this, do the following.
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2. Check the hydraulic lifter by pressing on it with a pointed tool (the cam should face the hydraulic lifter with the back of the head). If the hydraulic lifter is in good working order, it should be sunk with considerable effort. If this force is small, the hydraulic lifter is faulty. 3. To replace the hydraulic compensator, remove the camshaft (see. |
Hydraulic compensators
is equipment that uses oil pressure in order to adjust the gap betweencamshaft and valves, which leads to lower fuel consumption. Main partshydraulic compensators is an outer cylinder and a movable part with a spring. The device is also equipped with valves in the form of small balls that clamp the springs. Into the cavityhydraulic compensator it is necessary to fill in oil by pulling out inside... Then you need to squeeze the mechanism back. Then the oil goes to the rocker bearing.Replacement methods hydraulic compensator hyundai car Accent
In order to replace the hydraulic lifter, it is necessary for the car's engine to cool down completely, so as not to get burned. After the engine has completely cooled down, the oil pressure will be equal to the minimum. It is necessary to fix the pulley so that it does not budge. In addition, it will not be superfluous to change the old head gasket at the same time. Please note that before installinghydraulic lifters car Hyundai Accent, they must be filled with oil. For thishydraulic lifters must be immersed in a container that is completely filled with oil, pressing them down several times so that no air bubbles remain. For disassemblyhydraulic compensator a jack, wrenches and screwdrivers must be used.
Dismantling the car compensator is carried out as follows:
First of all, you need to disconnect the cylinder block cover by unscrewing the bolts. Then match the round hole on the belt axis with the bright red notch on the left side of the cylinder head. To do this, it is necessary, with the help of a jack, to raise the wheel located on the right side of the car and turn it until it coincides. Next, fix the axle with the belt by winding them with tow, creating several clamps.
Camshaft chain markings and the asterisks should point in different directions. For convenience, these positions can be marked with a bright marker. Then it is necessary to remove the chain from the camshaft partially with one sprocket, leaving partwith a belt axis. Hydraulic compensators the car are removed by hand without special tools. After liftingcamshaft it is recommended to remove fourhydraulic compensatorand also do not forget to move the axis. It is in the same position as it is fixed with clamps.
After assembling all the car parts, care must be taken not to overtighten the bolts. It is not recommended to use a special torque wrench.
After all parts are in place, start the engine. At first, it will rattle louder than usual. This happens during pumping.hydraulic compensator oil.
Replacement hydraulic compensator Hyundai Accent car
Replacement hydraulic compensator the vehicle is required when a loud sound is heard in the passenger compartment during engine start. Repeating sound several times serves as an alarm signal. Checkhydraulic compensator can be done very quickly. You just need to squeeze it. If this is not possible, then it is too early to change the hydraulic compensator. If air has formed inside, the expansion joint will begin to shrink. In this case, it must be replaced. It is enough to check only one hydraulic compensator and not check all the others, because other compensators have approximately the same shelf life and will fail from day to day.
But noise is not always the cause of the breakdown. Sometimes you just need to turn the valve and spring around the pulley. By turning the crankshaft, it is necessary to ensure that the valve, which makes a loud noise, begins to open. The spring and valve should also rotate gently. You should start the engine and listen carefully: if sounds are still heard, do the operation again. If this does not bring the desired result, the hydraulic lifter must be replaced.
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