Engine cushion malfunction: signs of breakage

Comfort in the car in many respects depends not only on properly made quality noise and vibration isolation. Even in the presence of such discomfort still can arise. Motorists often face motor vibrations. They can occur due to malfunctions in the engine operation or as a result of breakdowns of the motor fasteners. Especially often the owners of cars from AvtoVAZ complain about these problems, where sixteen-valve power units are installed. Car owners are faced with a strange knock in the engine compartment. He's fickle. It can appear, then disappear during acceleration or when driving on an uneven road. The fault is the engine cushion. Signs of this phenomenon - vibration. But that is not all.

Typical causes of engine noise

If in the course of driving a distinctive knocking from under the hood became clear, more precisely, from under the bottom of the motor or in the region of the transmission, if in the process of switching from 2nd to 4th gear noise and vibration increase, it may To be connected with the disturbances in the operation of the suspension or with the operation of the engine. Depending on the condition of the road surface, these sounds can build up.

Engine Pillow

A cushion is called the gasket between the engine and the body elements. On Soviet-made cars, this product looked very simple. This is a strong rubber insert with places for fasteners. The modern support of the power unit can be in various designs. Allocate hydraulic cushions, rubber parts. Often, the engine and gearbox on vehicles with front-wheel drive are secured with four or five such supports. So, two of them are under the gearbox, and the rest are under the engine. The rubber mount can look different. Often it is a cylinder made of steel or aluminum, inside of which is a rubber sealant block. Also there is a so-called lamp from aluminum alloys with an insert from rubber.

Standard arrangement of pillows

The right support is located on top and is attached to the side member of the car body. The front is fixed most often on the beam of the motor, you can see it from the bottom. The rear cushion can be found fixed on the bottom or on the front sub-frame of the body. As for the rear support, then on certain engines it may not be at all. The support for the gearbox is common. It is mounted closer to the rear of the engine.

Typical malfunctions

If the car is operated for a long time in conditions of severe loads or temperature changes, then all this does not have the best effect on the state of engine bearings. Over time, rubber loses its elasticity. In addition, the pillow can become exfoliated or cracked, or even completely destroyed. But it is worth considering that the life of these parts is quite large - more than 100 000 km. High loads of the support are exposed at the time of starting the car and during braking. If the car owner likes to drive fast enough, with sharp jerks at the start, then the pylons do not serve their intended time. Also, among the typical faults, there is a breakdown of the metal aluminum bracket. This often happens when a collision is made to distinguish an obstacle. If there are oil leaks in the engine, it will necessarily fall on the rubber part of the support. This grease can fray the silent block, and the support will fail. Also, not the best way on the rubber part of the pillow is affected by the cooling liquid. Breakdowns in the system must be immediately eliminated. Do not overheat the engine. In addition to the cracked cylinder head, the antifreeze from the expansion tank will fall on the rubber parts. This is not the best way to affect their resource. It is important to remember that it is not only unpleasant to operate cars with broken supports, but in some cases it is unsafe.

How to determine that the support of the unit is out of order

Often novice drivers do not know how to diagnose a malfunction of the engine cushion. The signs of such breakdown are often confused with something else. The first signal of a breakage of the support - it's unpleasant sounds like clicks or knocking in the front of the car at the beginning of the movement or when braking. Another sign is revealed when driving on uneven roads. Such driving is necessarily accompanied by characteristic impacts in front of the car. Also about the failure of the pillow can say and suddenly appeared vibration. Sometimes when driving on bad roads, you can give a gearbox to the lever. This all indicates that there is a malfunction of the engine cushion. These symptoms must be taken into account and then diagnosed. Sometimes it is very difficult to determine the breakdown of a support. Usually motorists write off the vibrations that the motor is not warm enough and often they just do not pay proper attention to them. A characteristic sign that will tell about the failure of the part is squeak.

Methods of diagnosis

So, the owner believes that the engine cushion has failed. Symptoms of the malfunction were confirmed. Next, you need to check the condition of the supports. In order to verify the integrity of these parts, you will need a jack and any supports - tree stumps, pallets, tires. Will approach anything. It is also desirable to prepare a mount or a thick stick. Let's look at how to determine the malfunction of the engine cushion. To do this, it is recommended to install the car on the most flat surface. Then the machine needs to be lifted by means of a jack, then under the engine it is necessary to establish the prepared support. It could be a log or something. The jack should be removed.

Visual inspection

Check the condition of the power unit supports, you can visually. To do this, the owner must lie under the car and inspect the supports. When inspecting, you can identify hardened rubber, cracks and gusts, delamination - this is in fact a detachment of metal from rubber.

Check backlash

This option is used, if there is a malfunction of the engine cushion, there are signs, but here it was not possible to detect something visually. It is necessary to check the presence of backlashes on attaching the engine mounts to the body. For a thorough examination, experts recommend using a stick or mount to swing the pillows from side to side. If you can find a large play in the places where the engine support is attached to the body, then you can perform self-repair. But you can also go to the SRT and fix the problem there.

Signs of failure of engine support "Lada Priora"

Automobiles VAZ practically nothing constructively differ from cars of any other manufacturers. The same applies to the arrangement and arrangement of parts such as engine cushions. Signs of malfunction ("Priora" including) can be detected by the characteristic vibrations of the motor. This manifests itself at idle and higher revs. The engine will twitch unnaturally. This signal to the owner about the need to check the poles or replace them. The second sign is twitching the steering wheel. The steering wheel oscillations depend on the frequency of the power unit. Another about the failed pillows can say the gearbox. During the movement, the transmission will be knocked out.

Ford

Vibrations on the body of the car at idle and during the movement indicate that the engine cushions are out of order or damaged. Symptoms of a malfunction ("Ford Focus 2" including) may be different. On cars "Ford Focus" uses two supports. Right - hydraulic, left - transmission support. In case of damage, it is recommended that both elements be replaced. Naturally, it is possible to replace only the damaged one and the vibrations will pass, but the new support will be subjected to much greater loads and will fail much earlier than its term. As a replacement, it is worth purchasing original parts. Inexpensive analogues serve less than 20 thousand kilometers.

Mazda Demio

Symptoms of a malfunction of the left engine cushion Mazda Demio are knocks and vibrations. The supports have a serious load. It is worthwhile to carefully monitor the condition of the pillows, a faulty part can damage the motor. In this car there are three pillows: left, right and bottom. The second is located near the engine filler neck. Under the battery is the left support. The lower one is directly opposite the engine joint and automatic transmission. The ways of diagnosing a malfunction in this case are the same as for any other car - this is a visual inspection and check of backlashes.

Engine and automatic engine mounts

Beginning car owners often wonder why an automatic transmission jerks when driving. There are many reasons for this. And can the automatic gearbox jump because of a malfunction of the engine cushions? Yes maybe. Sometimes the behavior of the car changes. Therefore, if foreign vibrations, shocks, hum, characteristic noise are noticed, then it is best to check the supports.