Replacing the valves on the "Prior" (16 valves) with their own hands

The modern "Prior" engine is a sixteen-valve injection unit with integrated valves, which, unlike previous analogues, are characterized by high reliability and a long service life. But when the belt of the gas distribution mechanism breaks, the pistons collide with the valves, which can cause bending of the latter. Further operation of such a car is no longer possible. The output is the replacement of the valves on the "Prior" (16 valves). Reviews of motorists note that such a malfunction arises extremely rarely. Most often this happens because of late replacement of the belt. In today's article, we'll look at how valves are replaced (Priora, 16 valves), as well as installing candles and cleaning injectors.

Belt status

Drivers should take into account that the valves can last a million kilometers, provided high-quality fuel is used. However, this is not the only condition for reliable and long operation. The fact is that if you regularly check the condition of the timing belt for the presence of ruptures and microcracks, you can completely eliminate the bending of the valves. If you find any defect on the surface of this part, immediately purchase a new belt. So you reduce the chances of bending the parts several times.

What if they are already bent?

If this incident has already occurred, it should be noted that dismantling of these elements, as well as replacing the hydraulic compensators (Priora, 16 valves), is not so easy, since it requires disassembly of the cylinder head. It is worth noting that the very dismantling of cylinder head is performed only in extreme cases. That is only with the replacement of springs, valves and other important mechanisms. Also, each time the cylinder block is disassembled, a new gasket is installed.

The valves are replaced on the "Prior" (16 valves) from the disassembly of the engine. Of course, the entire motor must not be disassembled - it is enough simply to remove the head and install it on a special workbench so that the distribution heads are located at the top. Next, you need to remove the engine support on the left side. To do this, unscrew the nuts holding the support. When they are unscrewed, it will be very easy to extract it. In the next step, the support bracket must be dismantled by removing the fuel tube fixing bolts and the phase sensor beforehand. Further, with the help of a key for 21 disconnect the sensor from the alarm system. This element signals a critical oil level, it is located in the bearing housing.

Thermostat

Then you need to go to the thermostat. "Priora" (16 valves), the replacement in which the thermostat itself is not required, remains still on the go. The next step is to remove the temperature sensor from the body of the element. It is used to monitor the temperature of the coolant. Now it is possible to loosen a few fixing bolts and freely take the thermostat out. The sealing gasket is removed from the studs. After that, you need to remove all the candles. In this case, such an action as replacing the pump, "Priora" (16 valves) will not demand from you. Below you will find detailed instructions for the removal of candles.

Replacement of candles ("Priora", 16 valves)

In general, this operation should be carried out once in 30 thousand kilometers. But in the case of bending the valves will have to take them out before. The main difference between eight and sixteen-valve "Prior" motors lies in the depth of the arrangement of the candles. In our case, they are hidden very deeply, so we will experience some difficulties in the work.

Tools for work

In order to extract these elements, we need the following set of tools:

1. Candle key for 16 millimeters with a rubber band.
2. The key is 10 with ratchet.
3. Ratchet handle.
4. Extension. Without it, we will not get to the wells.

Initially, the upper engine cover is removed (plastic decorative cover). By the way, before this you need to remove all the ignition coils. To do this, remove from each side of the plug and unscrew the bolts fixing each of them. Further we pass to candles. To do this, it is recommended to use a candle head with a rubber ring to grasp the part from the well. At this stage, the extraction of candles can be considered complete.

Spin force

When further assembling, pay great attention to the effort with which you spin them back. For such a car as the VAZ "Priora", the moment is 30-40 Nm. If there is no dynamometric key, you can use the folk way. To do this, we twist the candle with one hand until it stops. This effort is enough to twist the details into the well. By the way, if you lightly hold the candle, while the engine is running, it can simply fire outward due to the high pressure in the combustion chamber of the engine.

And what about the cost? A set of new parts can be purchased at a price of 500 to 2 thousand rubles, depending on the manufacturer. For injector motors, select items marked "R".

What's next?

At this, the replacement of the valves on the "Prior" (16 valves) does not end. After unscrewing the spark plugs, unscrew all bolts securing the camshaft, and then remove this part. On the sixteen-valve "Priora" there are two, and you need to shoot both shafts. To do this, you also need to remove the plugs located in the end of the cylinder head. After the motor is dismantled, the valves are replaced immediately. On the "Prior" (16 valves) it is done as follows.

After removing the camshaft with a puller, remove the fastening "crackers". It is recommended that you place a small stand under the "small plates". How is the valve replacement on "Prior" (16 valves)? After removing these parts, the plate is taken out together with the springs. It should be very careful, since the force of the springs is very large. By negligence they can jump off the plate. Under the springs there is one more detail. These are persistent plates. They also need to be removed. But this is done only after removing the stuffing box. In order to dismantle it, we will use a special grip.

The process of dismantling is as follows. We tighten the grip of the stuffing box, while pressing it slightly. Having made pair of turns to the right-to the left (at the moment of проворачивания) we extend an epiploon upwards. It is not recommended to make such inclinations with the clamped hold, as there is a risk of damage to the bead of the mechanism on the guide bushing. That's all, most of the work we did. Now it remains only to pull out the old valves and install new ones.

What should I do not to bend the valves?

Often motorists solve this problem by installing a piston group type 124. However, this replacement is not worth your money, say the reviews. After all, you will need to remove the old piston group, take out the engine, disassemble it, remove all the shafts and so on. On SRT for this procedure you will take about 50 thousand rubles.

But there is a simpler and cheaper way - just to regularly diagnose the timing belt for defects and, if necessary, change it to a new one. Also worth noting that buy a belt should only be branded. Otherwise, there is a risk that it will break already in the next 10 thousand kilometers. Quality belts "walk" on 100-200 thousand kilometers and do not need a replacement. Therefore, you should not save on such a responsible purchase. Well, the most reliable option is the use of a chain instead of a belt (as at ZMZ 406), but on the "Prior" engines this, unfortunately, can not be done.

Replacement of injectors

"Priora" (16 valves) is equipped with very reliable spray nozzles, so replacing them will be an extremely unprofitable solution. In general, it must be said that the dismantling of these elements refers to such types of work that need to be done only as a last resort.

The main signs that you need to replace these parts

• A sharp drop in engine power.
• "Trochanie" (when one of the cylinders in the motor stops working).
• Increase fuel consumption.
• Difficult start of engine even "on hot".

Cleaning the injectors is a more democratic solution than replacing them with new parts, and in both cases they will have to be removed. Below we will consider how to remove and clean this part from accumulated deposits.

First you need to remove the ramp. This is the detail in which the nozzles are located. When replacing the engine itself must be cooled down.

So, how to remove the ramp? To begin with, we de-energize the gasoline pump by disconnecting the wires from it, starting the engine and letting it run on the remaining fuel that is in the fuel lines, until it stops. So we will remove the differences in the pressure from the gasoline supply system. Then we safely remove the ramp, having previously disconnected it (the wiring is located on the side of the passenger compartment).

For further dismantling, unscrew the fuel hoses and all the wiring connected to the ramp. This is an idle speed regulator , a pressure regulator, as well as a throttle position sensor. Using a hexagon, unscrew the 2 bolts of the ramp fastening. The last detail can now be safely removed in the direction parallel to the ground.

Now the injectors

Clean them on a clean, clean surface. For further work we need the following elements: nozzles, a 12 volt bulb, a carburetor cleaning balloon, a switch and a pair of wires. All parts are connected in series:

1. Lamp.
2. Nozzle.
3. Switch.

Using a plastic clip, attach the hose at the outlet of the spray nozzle with a length of 30 centimeters. Next, turn on the nozzle, and put the end of the tube into the cleaning fluid. We follow the change in the spraying of the jet. It can expand or narrow (it all depends on the degree of contamination). After the jet stops changing, you can safely complete the cleaning process. The assembly of the element is carried out in the reverse order similar to the removal. For the future, it should be taken into account that such an operation should be repeated at least once in 30 thousand kilometers of run (as well as replacement of candles).

So, we found out how the valves are replaced on the "Prior" (16 valves) with their own hands. As you can see, this process is very complicated, but you can still cope with it.