Emulsion on the lid of the oil filler neck (VAZ-2107, Skoda, Gazel, BMW)

Specialists recommend replacing the oil every 8 and 10 thousand kilometers on diesel and gasoline engines, respectively. However, when the cap is opened, an emulsion appears on the lid of the oil filler neck. This "mayonnaise" uniquely drives drivers into shock. What to do if an emulsion formed on the cover of the oil filler neck of BMW or another car? Let's consider.

Causes

The presence of so-called mayonnaise can speak about many things. Often, this emulsion occurs when a coolant enters the crankcase system. It happens:

• Because of the breakdown of the gasket between the block and the head.
• Presence of a crack in the head or block.
• Deformations of the cylinder head.
• Water or coolant (tosol or antifreeze) enters the cylinders, and then into the crankcase of the engine.
• Formation of condensate.
• Absence of ventilation of crankcase gases. Hot gas contains a large percentage of water, which condenses at the top of the engine, and as a result, there is an emulsion on the lid of the oil filler neck.

Determine the exact cause of the "mayonnaise" is quite difficult. However, in 80 percent this is a breakdown of the cylinder head gasket. Due to this malfunction, the antifreeze contained in the cooling system is mixed in the oil channels with the lubrication system. As a result, an emulsion appears under the oil filler cap. It is worth noting that such oil and antifreeze are no longer subject to further exploitation. Both components are changed to new ones. By the way, the emulsion on the lid of the oil filler neck (VAZ-2107 is not an exception) can arise due to operating conditions. Often it occurs in winter and autumn during the first cold snaps. This is due to the occurrence of condensate, which is formed when the temperature difference between the warmed-up motor and outdoor air from the street. When the engine is warm, the moisture vapor that has fallen into the grease evaporates, and then condenses on the plug. Because of this, an emulsion is formed on the lid of the oil filler neck. The Gazelle suffers from such a "disease" rarely. However, when it is discovered, urgent measures must be taken.

Checking other places

In addition to the lid "mayonnaise" can be formed on the dipstick. It should also be checked. Also the reason is the use of a bad oil, which does not provide any lubricating properties. There are cases when the emulsion on the lid of the oil filler neck (the photo is presented in our article) disappears by itself - with the first warming. But if the problem does not go away long enough, it is a signal that speaks about the breakdown in the cylinder head. It is through the gasket that these two components are mixed - oil and antifreeze.

Replacement of gaskets on BMW cars, Skoda, VAZ, Gazelle

The process of dismantling the block is the same for all engines (except that apart from the rotor "Mazda" and the opposites "Subaru"). The head of the unit is dismantled together with the receiver and the output "spider". To perform this operation, it is necessary to take several steps. First, the fuel wires are disconnected to supply and drain the fuel. Then the "minus" from the battery is removed. With the help of a ring wrench, the bonnet mounting bolts are removed. Next, you need to dismantle the front bumper and the mudguard of the engine. After drain the old coolant. On cars VAZ, "Gazelle" and foreign cars (such as "Skoda" and "BMW"), it pours out by unscrewing the cock below the radiator. Preliminarily, a container is substituted for it. For cars, a 5-liter canister is sufficient, for trucks of the "Gazelle" type - at least 10-liter. After that, the ignition coils and the plug connector of the valve timing sensor are dismantled. After that, unscrew the bolts and remove the wires from the two oil sensors - pressure and emergency pressure. Disconnect the pads from temperature sensors, coolant heating indicator. After this, the tightening of the yoke is loosened and the thermostat is taken out together with the branch pipes leading to the expansion tank. Further weaken the tightening of the element going to the check valve of the brake vacuum. Take out the shoe from DPDZ. Then remove the ground wire from the stud on the front of the receiver (usually it's blue). Then unscrew the nut and pull out the accelerator. Disconnect the crankshaft speed sensor. It is fixed between the sprocket of the pulley and the shaft. Remove the shoe between the intake pipes of the engine. From the cable of the threaded end, the gland is shifted and the cable fixing nut is unscrewed. Remove the element from the bracket, which is attached to the intake pipe of the engine. For best effect, you must move it back. The holder of the cable of the gas pedal (if it is a VAZ car or "GAZelle") is bent and the element gets to the outside. Also remove all the wires from the generator, take out the connector plug from the RXX (idle speed regulator). Then remove the pads of the temperature sensor, loosen the nozzle of the filing of antifreeze from the connection of the heater stove. Now we got to the intake system. We take out the plug-in pads from the four nozzles, unbend the wiring harnesses from the holders and take them outside. In turn, the exhaust system: the exhaust pipe, which comes from the exhaust manifold, is disconnected. The next stage will be the dismantling of the generator and throttle body.

Dismantling the unit

We have already done most of the work. Next, we describe the order of dismantling the cylinder block from the engine. For this you need:

• Remove the camshaft. If the motor is 16-valve, 2 shafts are extracted.
• The clamp is loosened and the hose is removed from the throttle body.
• The thermostat assembly is removed.
• Unscrew bolts securing the cylinder head together with washers.
• The head is removed together with the gasket.

It is important

Do not use a screwdriver, knives and other improvised items to remove the cylinder head. In this way, you will damage the surface of the element, which is adjacent to the block.

Assembly

It remains only to install a new gasket and collect everything in place. Please note that before installation, it is smeared with a red silicone sealant. The surface of the unit and the head (mating parts) are thoroughly cleaned of the remnants of the old sealant, accumulated chips and grease. Carefully look at the coincidence of the labels. If the gasket is installed upside down, the situation will only worsen. Further installation is in the reverse order. After this, the cylinder head is defective: using a steel ruler and probes, the flatness of the head surface is checked, which is adjacent to the block. To do this, you must place the ruler along the element, and with the probes measure the gap between both planes. If it is at least 0.2 mm, the head must be replaced. Observe the order of tightening the bolts (crosswise). A torque wrench is required . At the first stage, the tightening force is 39-61 N · m. After 2 hours, the second stage is produced. The tightening force in this case is from 130 to 140 Nm.

Final stage

And the last stage is the pouring of a new antifreeze and oil. Now they should not intersect with each other, forming "mayonnaise". Emulsion on the lid of the oil filler neck you no longer face. By the way, in order to avoid the formation of an airlock while pouring antifreeze, you should adhere to some pauses. That is, to allow him to completely drain from the expansion tank through the nozzles into the radiator.

For greater efficiency, you can put the car under a slope so that the front of it is higher than the rear. Then all available zavozdushiny will gather in the expansion tank.

How to prevent the formation of "mayonnaise"?

To ensure that the emulsion on the oil filler cap does not bother you, you must remember one simple rule: do not heat the engine for a long time at idle. In this mode of operation , the crankcase ventilation system is practically not activated. Therefore, the formation of condensate - water. Especially since the engine on the XX does not really warm up.

Conclusion

So, we have found out, for what reasons there is an emulsion on a cover маслозаливной a mouth. "Skoda" you have or "Gazelle" - it does not matter, since "mayonnaise" is equally dangerous for all cars. If the problem does not disappear by itself, do not close your eyes to it. Probably, you had a breakdown of the cylinder head gasket. As you can see, you can make a replacement yourself, however, in the absence of experience or confidence, it is better to entrust this matter to professionals.