Hydraulic lifters of the Hyundai Accent car: disassembly and replacement features. Hydraulic lifters of a Hyundai Accent car: disassembly and replacement features How to replace hydraulic lifters with a Hyundai Accent

08.07.2020

The hydraulic compensator or, as it is also commonly called, the hydraulic valve tappet is a hydromechanical device that can change its length. It must compensate for the thermal gap between the valves and camshaft and is the main component for automatic valve adjustment.

The hydraulic compensator includes an outer cylinder and a movable inner part, which is repelled by a 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 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 lifter 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 should come out of the hydraulic pusher and a jet is fed to the rocker bearing, this is how it is lubricated. The principle of operation of the 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 again try to compress. 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, at first on an unheated, cold engine, and over time on a warm one.

Sometimes, the noise that the valves make can be eliminated. To do this, you will need to slightly turn the spring or valve around the longitudinal axis.

Turn 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 the 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 a Hyundai Accent?

It is not necessary to remove the cylinder head from the engine to replace the hydraulic valve lifters. Removing the camshaft housing is sufficient for replacement. 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. At the same time, bubbles will rise, coming out of 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, which 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, it is necessary to 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 the need for 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 compensators 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 (round hole) exactly under it. If it doesn't work, then you have to raise it a little right wheel and twist it until the dots match.

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 sprockets and on the chain, which will have to be removed. PS. it is possible not to remove the chain from the belt pulley sprocket.

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 lifters. Officially, they need to be twisted with a force of 12-14 Nm, but in reality, 2 bolts were torn off, it was very difficult to pull them back out. Use a proven and good torque wrench.

2017-03-06T23: 10: 45 + 00: 00 admin Accent 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 ...admin

Hydraulic 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 operating principle 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 against the cam 5 of the camshaft and the end of the valve stem by the expanding force of the springs 8, respectively. 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, select the clearance in the valve mechanism.

The oil pressure 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 filled, 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 purging 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 lifters 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.

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 lifter, remove camshaft(cm.

Hydraulic compensatorsis equipment that uses oil pressure to adjust the gap between camshaft and valves, which leads to lower fuel consumption. Main partshydraulic compensatorsis an outer cylinder and a movable part with a spring. Also, the device is equipped with valves in the form of small balls that clamp the springs. Into the cavityhydraulic compensatorit is necessary to fill in oil by pulling out the inner side. 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 lifterscar Hyundai Accent, they must be filled with oil. For thishydraulic liftersmust be immersed in a container that is completely filled with oil, pressing them several times so that no air bubbles remain. For disassemblyhydraulic compensatora jack, wrenches and screwdrivers must be used.

Disassembly of 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, using a jack, to raise the wheel located with right side the car and rotate it until it matches. 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 part with a belt axis. Hydraulic compensatorsthe car are removed by hand without any special tools. After lifting camshaft it is recommended to remove fourhydraulic compensator, and 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 compensatorHyundai Accent car

Replacement hydraulic compensatorthe vehicle is required when a loud sound is heard in the passenger compartment when the engine is started. Repeating sound several times serves as an alarm signal. Checkhydraulic compensatorcan 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 neatly. You should start the engine and listen carefully: if sounds are still heard, repeat the operation. If this does not bring the desired result, the hydraulic lifter must be replaced.

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Hydraulic compensators compensate for the thermal gap between the camshaft and the valves by changing their own length to automatically adjust the valves. They consist of an outer cylinder and a spring-mounted movable part. At the inlet of the device there is a valve - a ball, pressed by a spring. In the process of extending the inner part, the cavity of the compensator is filled with oil. Reverse compression of the mechanism occurs with force - the valve does not release oil. From the outlet, oil is supplied to the rocker bearing.

How to get to the hydraulic lifters?

Everything can be done manually - no hydraulic suction cup needed. Before replacing, we wait for the engine to cool completely - the oil pressure will be minimal. It is important to secure the pulley so that it does not move. Along the way, it is advisable to replace the cylinder head gasket with a new one. New hydraulic lifters are filled with oil before installation. The compensator is lowered into the filled container, squeezed several times until the bubbles stop coming out. For disassembly you will need a jack, keys and screwdrivers:

Unscrew the screws and remove the cylinder block cover.
The belt pulley has a round hole. It needs to be aligned with the red notch on the left of the cylinder head. You need to raise the right wheel with a jack and turn it until it matches.
With a pair of clamps, firmly fix the pulley with the belt to each other.
On the sprockets and the camshaft chain, the marks should point in opposite directions. You can additionally mark the position with a marker.
The camshaft chain can now be removed. We remove it with one sprocket, leave the part with the belt pulley.
Hyundai Accent hydraulic lifters are easy to remove without special tools. Four of them near the belt pulley are removed after raising the camshaft, you still need to move the pulley. Due to the fixation with clamps, it does not move.
When reassembling, avoid overtightening the bolts and do not use a torque wrench.

After replacement at start-up, the engine makes more noise than usual - this takes place after the expansion joints are completely “pumped” with oil.

When do you need to replace hydraulic lifters?

The hallmark is a ringing sound at a cold start of the Hyundai Accent. In advanced cases, a knock is heard at every start. The removed hydraulic lifter is very easy to check: try to squeeze it - without air inside it is impossible. If even a little gives in, it is imperative to change. You don't need to check everything, just one is enough. The service life is approximately the same, the "bells" from all compensators will go further.

The described noise effect on the Accent is not always caused by a malfunction of the hydraulic lifters. Sometimes turning around the valve and spring axis is sufficient. By turning the crankshaft, we achieve that the noisy valve begins to open slightly. Lightly, with a small step, the spring with the valve unfolds. We start the engine and listen, if the knock remains, we do it again. You may need to tighten the spring - we measure and eliminate the gaps between the bushing and the guide. If it does not help, we change the hydraulic lifters.

Video: Replacing Hyundai Accent hydraulic lifters

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