Hydrocompensator knocks on the cold. Knocking of hydraulic compensators on a cold engine
Every motorist in operationthe vehicle certainly listens to how his car works. The appearance in the engine of extraneous noise, as a rule, does not bring joy to the owner. The presence of the slightest faults requires an urgent diagnosis and elimination of the problem. When working, the engine generates heat, and when exposed to the metal, the latter begins to expand. As a result, on some details large gaps are formed, which just lead to the appearance of extraneous noise. One of the problems may be pounding hydraulic compensators, which independently regulate the necessary clearance. In this article, we will approach a broad explanation of the topic. What is the hydraulic compensators (their device, purpose), why they knock on different operating modes of the engine - about all this, read below.
What it is?
This element is a piston, withwhich automatically adjusts the thermal gaps. The principle of operation of this device is quite simple. The bottom of the piston interacts with the camshaft cam.
The piston is fitted with a ball valve, with the help ofwhich opens the damper and oil begins to flow. When the piston is filled with oil, the existing plunger will be pressurized, which will cause the piston to move to the cam until it stops. As a result, the most optimal clearance is automatically installed. When the cam acts on the piston through the valve, part of the oil goes away.
The piston is slightly lowered, creating a gap. The latter on the hydrocompensator is regulated by the flow of incoming oil. At this stage, we learned what the hydraulic compensators are (their devices).
Why are they knocking?
This is easy enough to hear. The knocking of the hydraulic compensators on a cold engine or hot starts to manifest directly when the engine is running and has a direct effect on the stability of its operation.
The reasons for the fact that the element knocks "on the hot" are as follows:
- The oil pump has failed. The system does not generate the required pressure.
- The hydraulics of the hydraulic compensator is broken, that is, the system lacks the required amount of oil or, on the contrary, its surplus is present.
- The seat of the part was significantly increased due to the heating of the engine, during which the expansion of metals occurs.
These fault causes are typical only for the warmed-up engine. It is worth noting that the sound of these elements on a hot engine happens rarely.
Most often, the hydraulic compensator knocks on the "cold"while for both modes the sound may appear due to the poor quality of the oil. It also occurs due to a contaminated lubricant cleaning system.
Knocking of hydraulic compensators on a cold engine
The reasons why the part is knocking onunheated engine, much more than hot. It is not always possible to determine the source of the "scoop" of hydraulic compensators. Therefore, in some situations it is advisable to seek help from a specialized station.
The main reasons for the fact that on the cold engine the hydraulic hammers are knocking:
- Output on the plunger.
- Heavy contamination of engine oil due to violation of the timing of the change. Note: when the engine warms up with this cause, the knock will disappear, as a new batch of oil supplied to the part will wash out the production.
- The formation of bubbles, which adversely affects the compressibility of the lubricant.
- Failure or uneven operation of the ball valve.
- Use of low quality oil.
- Use a grease with a high viscosity. As a result, the oil does not arrive at all until the engine warms up.
- The filter element is dirty.
Now we know the main reasons, becausethat the hydraulic compensator knocks "on the cold". It is worth noting that at the same time several aggregates can not be knocked, as a rule, only one sounds. To find out which one has become worthless, it is necessary to make a diagnosis.
How to find out the faulty item
Having dealt with the causes of a possible malfunctionin the work of the engine, it is necessary to consider the method for determining the faulty part. In specialized workshops the determination of the knocking hydraulic compensator is performed using acoustic diagnostics.
In addition, knocking hydraulic compensator candetermine on the parsed engine. To do this, remove the valve cover and each of the elements to press. Elements that are easily drowned, just will be faulty, because they are dominated by the least pressure. The most important thing in diagnosing a malfunction is the lack of camshaft cam impact on the units. Other methods can not determine the faulty item.
What to do when an item is tapping
Most drivers are concerned about one question: when the hydrocompenser knocks, what should I do? Since most of the problems are directly related to poor quality of the oil or interruptions in the lubrication system, it is necessary to replace the oil and the filter element of the engine. In addition, the system channels must be flushed to remove the available operating time.
Selection of oil
In this situation, many will think about whatOil to pour at knocking hydraulic compensators. The answer is quite simple: it is necessary to fill in the grease of the required viscosity, which is recommended for use by the manufacturer. At the present time in the summer period it is most popular to use semisynthetics on cars, that is 10W-40. In winter, it should be poured 5W-40.
After changing the oil and filter, do not besure that there will be no sound. Quite the opposite: the knocking of the hydraulic compensators "on the cold" will also be heard due to the fact that the pistons do not leave any lubricant after draining. However, after warming up the engine, it must disappear, thus confirming the correctness of the replacement solution.
Not always the use of new oil will help removeknocking. This is due to how badly the malfunction was started. In this case, it is necessary to determine the defective component and dismantle it for subsequent washing in gasoline. Often due to the use of a bad oil, gradual contamination of the compensator occurs. The removed expansion joints are assembled back into place in the order in which they were dismantled. It should be noted that washing the elements is a rather complicated process that will require the car owner special skills.
The knock can be removed in the following way:
- Turn the crankshaft until the valve opens, which corresponds to the defective component.
- Then it is necessary to turn the valve at an angle to restore the correct installation of the part.
- After that, start the engine and check for sound.
This method is applicable in the event that the car "Grant" knocking hydraulic compensators "on the cold." If the cause is not eliminated and the sound is still observed, a complete replacement of the part is required.
It should be remembered that, by virtue of the constructionmodern cars of domestic production, all models of the last generation have a brief knock of hydraulic compensators when the engine is started. There is nothing wrong with this, and it is not always possible to eliminate such a malfunction even as a result of repair in a specialized center or after a complete replacement of the part.
Installing a new part
It is produced if the sound does notdisappeared after the new oil. With washing, car owners do not dare to experiment. Replace the compensator with your own hands, and for all car models the process is identical. The only difference in specific models is the need to replace the valve cover gasket by virtue of the engine design.
Consider the process of replacing the expansion joints:
- Remove the valve cover.
- Remove the sprocket from the camshaft.
- Check the wearer and tensioner for wear.
- Remove the bed.
- Lay out the pushers strictly in the order of extraction.
- Get the expansion joints and put them in order.
- Cleaning of the lubrication system and the seating positions of the hydraulic compensators is performed.
- New elements are set neatly into place, with the screwing should be done with a torque wrench to control the applied force.
- The other parts are installed in the reverse order.
Result of ignoring repair
If the driver heard that the hydraulic compensatorknocks "on the cold," but still ignored the repair, the consequences may not be the most pleasant, despite the fact that the compensators do not have a particular effect on the wear of other engine components.
As a result of untimely repairs,there are problems with the engine lubrication system. In addition, signs of serious problems will be a reduction in the overall power of the power unit, as well as a drop in the speed of the car's acceleration and an increase in fuel consumption when moving at medium parameters.
So, we found out why the hydraulic compensator knocks "on the cold".