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Now, when driving, the knocking in the car should completely stop, but if this does not happen and you hear an annoying sound, then you should contact the nearest car service for a complete diagnosis and subsequent repair.
Many craftsmen prefer to replace hydraulic lifters with bolts. The mechanism is the same, except for the details themselves. This is done in order to save money as much as possible, because the purchase of all turnkey equipment will cost you up to two thousand rubles. With this alternative, the engine starts to run louder, but idle is more stable. ... At the same time, to fasten these bolts, you will need an additional special probe, with which they will be tightened. It should be remembered that when carrying out such manipulations, the official car warranty ceases to be valid, but you get a more durable system.
Replacing hydraulic lifters is not an easy task. But after carrying out all the work listed above, you can get a working system without the cost of repair services, as well as gain invaluable experience. And even in the event of a repeated breakdown, you can easily clean and replace hydraulic lifters, saving time and money.
Each machine has its own strengths and weaknesses. If your choice fell on a new model Niva with the name "Chevrolet" in addition to "mechanics", then this is what you need. It occupies a leading position among those few who are ready to challenge the Russian off-road, and it has undergone a serious restyling in comparison with previous versions. Purchasing spare parts for Niva will not be a difficult task, and with proper maintenance and care, the car will serve you for many years. But it will break down over time, like any other.
Perhaps you caught yourself on the fact that you already understand your car well, as they say, from a half-word. There something creaks and makes noise, here it groans and thunders. Any extraneous noise causes an adrenaline rush, and immediately there is an irresistible obsessive desire to grease, spray, change and put on. And this is good. This is roughly what the harmony of man with a machine looks like.
But imagine such a conditional situation when the engine is already started and starts to warm up a little. When suddenly your sensitive ear picks up some suspicious knocking just in the area of the engine head. You get behind the wheel and drive off. The knocking seems to disappear for a while, at least nothing is heard due to the roar of the engine. As soon as the car stops and idles, the knock appears again.
The diagnosis is simple - it is the hydraulic lifters (valves) knocking.
If you hear the clatter of valves even with a well-warmed engine, then there is something to worry about, but early to panic. Usually only one valve fails, not all at once. It is impossible to determine which one "died" without skills and special tools. Therefore, you will have to buy and replace the entire kit. But more on that later.
Replacing hydraulic lifters for beginners is a very difficult process. You can call such a process the import word restyling, because we will change the state of our machine, and it will feel completely new. If you doubt what will happen, drive the car to the service station, and the trick is in the bag. But more economical and persistent motorists may want to try their hand, and you can acquire the skill, and get to know the hardware better. Now is the time to run for a new set of valves. Yes, and you will have to buy a new gasket. Have you bought it? We are starting the replacement.
We act strictly in the order described below:
We remove the cover of the hydraulic lifters and put it aside.
We fix the chain on the camshaft sprocket with a wire and carefully remove it.
Unscrew the crankshaft bed mount and remove it.
We dismantle the rockers and lay them out in the order they stood.
We remove and radically throw the hydraulic lifters into the bucket.
We clean thoroughly and lubricate the places where we will install new units with engine oil.
We screw in the hydraulic adjusters with effort very tightly.
Putting everything that was removed earlier in the reverse order.
You will need a wide-blade screwdriver to place the new parts back in place.
We will not put the lid back in place yet.
Now we begin the process of thoroughly cleaning the valve cover from oil and dirt adhering from the inside, which has literally eaten into the metal. The process is not very fast and not pleasant, but extremely important. Therefore, we are not in a hurry, because when will we be able to get to her next time?
In the same way, we clean the seat for the gasket, cutting off and cleaning off the remnants of the sealant, as well as pieces of the worn out gasket. By the way, the old gasket should have been in the bin for a long time. And no assumptions on the topic that suddenly it will come in handy. What tools do you need for this? A regular screwdriver, the back of a knife, or even a spatula can come in handy.
Now it remains to tighten the retainer correctly. In no case should you first twist one side, and then the other, since the gasket will still skew and squeeze to the side. Screw diagonally, tightening gradually to the end.
Most often, hydraulic lifters do not fail completely, but become heavily contaminated, as a result of which they are simply not able to perform the task assigned to them correctly. Or only one breaks, as noted above. If you have the time and desire, you can try to get the hydraulic lifters back from the bucket, which we had previously thrown there, and carry out restoration work.
To do this, you need to disassemble the units and rinse everything thoroughly. After that, reassemble everything in the reverse order. Sometimes there are situations when additional replacement of the adjusting bolts leads to good results, which also fail over time. What to do is up to you. The main thing is that the machine starts up again and pleases you with the uniform hum of a steadily working engine.
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Replacing hydraulic lifters in a Chevrolet Niva is carried out when the sound cannot be eliminated by other means. To do this, you can try to flush them or remove the camshaft and clean the channels. If this does not help, then you need to put on new "gidrics". The process of performing work can be divided into 2 stages: preparation of parts and tools and the repair itself.
First of all, removing the valve cover, you will damage the gasket under it, so you need to purchase a new one. It costs from 100 to 500 rubles, depending on the manufacturer and quality. Additionally, you will need a sealant, if it is not in your garage, it is advisable to take care of this in advance, since a gasket is installed on it. Naturally, new hydraulic lifters are bought. From the tools you need to prepare the following:
A set of car keys;
Ratchet wrench;
Screwdriver (Phillips and flat);
10 cm soft wire or nylon tie;
Large syringe for pumping oil;
1 - 2 liters of gasoline;
Rags;
Metal brush.
The machine is placed on a flat surface, the neutral speed is switched on;
With the help of a screwdriver, the rubber corrugation of the air duct (tortoise) is removed;
The branch pipes that block access to the valve cover are disconnected;
With a 10 key, 8 bolts of its fastening are unscrewed;
The serviceability of the hydrosupport is checked. All levers must be pressed in turn, while the plunger must go down completely. If pressing is given with difficulty, and the support practically does not move, the "hydrics" are working. In the opposite situation, when the levers move freely, we continue to disassemble the car;
The crankshaft head is carefully rotated until the mark on the camshaft sprocket is aligned with the mark on the gears;
A Phillips screwdriver presses the tensioner plunger;
The bolt securing the working gear is unscrewed;
The plunger at this time can be fixed in one position by screwing the cap nut onto it;
In this case, the camshaft sprocket is unscrewed, but not disconnected from the base. Below, in the pallet, the chain must also be firmly fixed and tensioned;
After the engine is assembled, it is advisable to clean the valve cover from carbon deposits, dust and old oil. The same is done with the surface on which the new gasket is placed. It is imperative to remove the remnants of old rubber or cork, sealant. This is done with a clerical knife or spatula. The installation of a new gasket is carried out on the sealant layer. When installing the cover, it is necessary to control the tightening torque of the nuts and not allow them to skew.
Older hydraulic lifters should not be overtightened. From this they quickly deteriorate, but it is also not recommended to leave them weakened. The tightening force should not exceed 2 kg / s.
Having disassembled the upper part of the car engine and removing the old "hydrics", before changing to new ones, you can try to disassemble and wash them. If you need to make an effort to press the lever, then replacing the hydraulic lifters on the Chevrolet Niva is no longer required, flushing helped. If the procedure does not bring results, we change to new ones.
On cars, a problem very often arises with the fact that the valves begin to knock, or the engine runs intermittently, this may be due to the fact that the hydraulic lifter does not work correctly, therefore, it is necessary to replace the hydraulic lifters for normal operation, the Chevrolet Niva is no exception.
And so let's figure out why the valves are knocking
On classic VAZ engines, a rocker is installed in the gas distribution mechanism, and the gaps in the valves can be adjusted using screws. And on 2123 cars, a hydraulic compensator is installed instead, which in their shape resemble the same adjusting vents, but without gaps, and are adjusted thanks to a plunger pair that work under oil pressure. This hydraulic compensator on Chevrolet Niva cars consists of several parts, and its device is very simple, it consists of:
Frame
Return spring
Upper and lower part of the plow pair
Timing valves can knock for the following reasons:
Insufficient oil pressure in the system
Clogged oil valves due to dirty engine oil
Insufficient oil level in the lubrication system
The seat under the expansion joint is worn out
Parts installed in the system, due to poor quality, require replacement
As a rule, the GC knocks when the car is not yet warmed up, and a minute after the car is started, the knock disappears. This is due to the fact that the oil supply occurs with a certain delay, and you can try to eliminate this problem by replacing the oil filter along with the oil. If the knocking occurs while the engine is warmed up, this is already more serious, therefore, it is necessary to remove the hydraulic lifters and the camshaft and clean all the channels. If after that the knock remains, then it is necessary to change the GCs themselves.
But the valve knock appears not only due to the fact that the hydraulics are faulty, but the reason for this may be the following:
Camshaft cams worn out
The valve stem end is worn out
The surface of the rockers is worn out
But it also happens that the hydraulic lifter on a Chevrolet Niva car causes intense wear of the camshaft and rockers. If a valve knock occurs, then driving is not recommended for the following reasons:
Parts of the gas distribution mechanism fail
Due to the rather large clearance, power is lost in the valves, increasing fuel consumption
This knock is unpleasant to the ear.
Already with low mileage this knock may appear, this is because initially from the factory they are installed on the Chevrolet Niva, low-quality expansion joints, the reason may also be insufficient rotation of the main engine at the factory, but if the hydraulics are still inoperative, then they can be replaced, for example, with those, which are produced by the German company INA, they are one of the most reliable, you can also purchase derivatives for this car at AvtoVAZ, they come in two samples of the old and new and differ in cylinder heads.
Basically, they are sold by the piece, but their price is not cheap, and ranges from three hundred to four hundred rubles, but the adjusting bolt will cost half the price. If the adjustment occurs every ten thousand kilometers, then it will be more convenient to put an adjusting bolt, since there will be fewer problems and it turns out cheaper.
If there is a knock, do not rush to remove the valve cover, first change the engine oil in the engine
Fill in the same brand of oil, this will reduce the chance that the HA will become clogged.
They should not be tightened too much, as the constriction will lead to a quick failure.
Before installing new ones, it is advisable to rinse the old ones in gasoline in order to clear it of toxins, then check it by pressing the plunger with your finger and if it returns to its original place, it is serviceable
Video (click to play).
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