"Renault Logan": adjustment of the valve. How to adjust the valve

On cars "Renault Logan" valve adjustment is not the most difficult, but quite responsible work. First of all, it is necessary in order to prolong the life of the motor and avoid many troubles in the future. Before you start, you should find out how the valves work and what they are for. A small technical education program is needed to better understand the principle of the gas distribution mechanism.

What are these elements for?

The valves in the internal combustion engine are a very important part of it. These elements are responsible for filling the fuel mixture of the combustion chambers and then releasing them from the burnt residues. Each cylinder of the four-stroke engine has at least one intake and exhaust valve. They open the windows alternately. One in the intake stroke, the other during the release (at the end of the operating cycle), releasing the spent fuel mixture.

It is important that they tightly close, not letting anything out of the combustion chambers. Therefore, they open inward so that the pressure created inside the chamber will further press the valve. From the proper lapping (processing of the contact surfaces), the formation of coke and the amount of compression on its edges depends. All this can adversely affect the engine performance, the durability of the valves themselves and the increase in fuel consumption.

Valve timing

It is very important that the intake valves open exactly when necessary. A workable element admits the fuel mixture at the moment when the piston is at the top and closes before the candle ignites the fuel. It is equally important that the exhaust valve also opens the way out at the end of the working cycle. Otherwise, incomplete combustion of the fuel mixture will be observed.

As a result - overrun and drop in engine power. The dependence of the opening and closing of the valves in combination with the movements of the piston and the work of the candle is called the timing of the gas distribution. By adjusting them, you can increase or decrease power, increase the appetite of the engine and influence many other factors. It becomes clear how important the adjustment of the valve is in the Renault Logan.

What happens when the gap is adjusted incorrectly?

During the engine operation, these elements under the influence of heat from the fuel mixture change their dimensions (the so-called thermal expansion occurs) and the rod of the mechanism elongates. To adjust the clearance between the valve stem in the mechanism is an adjusting bolt, the rotation of which can compensate for the change. It appears only during engine operation. Therefore, the adjustment of the valves is more appropriately called the adjustment of the thermal gaps. They are very small, but at the slightest increase in their work, the uncontrolled valves will be noticeable by ear. The adjusting bolt, like a hammer, hits the butt of the rod. With the gap widened, the valves wear out quickly enough. This can even lead to the fire of the rod and its fall into the cylinder. In this case, without dismantling the engine and expensive repairs can not do. Therefore, a rustling metallic knock is a sure sign of increased gaps. He should alert the car enthusiast. You should set up as soon as possible.

Differences 8- and 16-valve engine

In Russia cars "Renault Logan" are sold with two types of engines: 8- and 16-valve with a capacity of 84 and 102 horsepower respectively. Also, the first motor has a reduced working volume. The 8-valve engine is rated for 1.4 liters, and 16V for 1.6 liters.

Both engines proved to be very reliable and unpretentious in operation. They run about 200,000 kilometers without problems. The difference between them, in fact, only in the heads of the block. The first - two valves per cylinder, the second - four. Another difference is that the engine has 16V hydraulic compensators for thermal gaps. Thus, the adjustment of valves is excluded. "Renault Logan" (8 valves) has to be adjusted periodically. But if the 16-valve engine will have a characteristic rustling sound, then the case is in hydraulic compensators. They rustle in the absence or low oil pressure.

Preparation for work. Removing the cover

On cars "Renault Logan" the valve adjustment, as well as on any other car, is made on a cold engine. First you need to free access to the adjusting bolts. To do this, the air filter housing is loosened and the air outlet is removed. After that, high-voltage wires with candles and coils are needed. They will interfere with us. Then, with the head "for 8", several bolts for securing the valve cover are loosened. The gasket underneath it will be replaced.

Removal of covers газораспределительного the mechanism

On the Renault Logan (8th grade), the valves are not adjusted until the pistons and valves are reciprocally aligned. For this purpose, there are special marks on the pulley of the camshaft. They must be combined. To get to them, you need to remove the covers on the left side of the engine.

To do this, loosen the generator belt and remove it, and then unscrew the belt pulley generator. To do this, turn on the 5th gear, head "at 18" with a large collar, you must turn the bolt that holds it. After that, wrap the element back. Now you can unscrew and remove the gas distribution cover to allow access to the marks on the pulley of the camshaft. In passing, you can evaluate the condition of the drive belt.

Marking on the camshaft pulley

Turning коленвал, it is necessary to achieve coincidence of special labels on a pulley of a cam-shaft and a belt of the generator.

They will mean that both valves in the 1st cylinder are closed. Also on the shaft there is a special mark in the middle. When it is strictly above, this indicates that the piston in the first cylinder is located as high as possible. Both valves are closed. You can make settings.

Adjustment of valves "Renault Logan" 1,6

On the market there were 8 valve units with this volume. So, the order of adjustment on the cylinders is the following: 1st, 3rd, 4th, 2nd. It is in this order that the pistons work. The first cylinder is closer to the flywheel. If you look at the front of the car, then it is the far right. The intake valves are closer to the nose of the machine, the exhaust valves are closer to the salon.

On the Renault Logan, the valve adjustment should be as follows:

• For intake valves clearance - 0,15 mm;
• For graduation - 0,25 mm.

It will be necessary to stock up the adjustment probes of the appropriate thickness. In order to adjust the clearances, it is necessary to loosen with a wrench the 10 locknuts of the rocker arm and check the distance between the bolt and the end of the valve stem with a feeler gauge.

Then tighten the adjusting bolt until the probe is inserted and pulled out with difficulty. In this case, the second key or pliers should be held on the locknut so that it does not turn. Next - tighten the lock nut and check the gap again. If it does not meet the requirements (the probe enters and leaves the distance freely, or does not enter at all), it is necessary to repeat the operation. After both valves are adjusted, the crankshaft is rotated 180 degrees clockwise and the tags are re-aligned. After that, you can start adjusting the valves of the third cylinder. The rest of the work is built according to the same scheme. After all the valves have been checked, it is necessary to crank the crankshaft for 1 full turn, again aligning the marks, and repeat the test. So the adjustment of the valves "Renault Logan" will end 1.4. 8 valves will be exposed with the necessary clearance. Assembly is carried out in the reverse order.

When installing the valve cover, a new gasket must be installed. It is installed on the sealant.

Conclusion

The adjustment of the valves "Renault Logan" hands is not so complicated as it seems. In addition, Renault engines are reliable, and rarely require such work. Nevertheless, it is necessary to check the valve clearances in order to protect themselves from possible troubles and problems in the future.