Operation of engine internal lubrication systemcombustion is possible only under condition of serviceability and coordinated actions of all its constructive elements. The failure of at least one of its parts will inevitably lead to malfunctions in the power unit.
In the article we will talk about what isis the oil pump pressure regulator and what are its functions. Also we will consider the principle of operation of this node of the lubrication system, we will tell you how to properly repair and adjust it.
As you know, oil is supplied to moving partsengine under a certain pressure, created by a working pump. Without this, the grease would simply be the glass in the crankcase, exposing the elements of the crank-connecting rod and gas distribution mechanisms to the effect of increased friction and overheating. But too high a pressure is dangerous for the engine. Gaskets, seals, seals are unable to withstand the excess of its normal performance. Because of this, the oil begins to ooze out from under them, and can also get into the power and cooling system of the power unit.
It is to reduce the lubrication pressure in the system andThe oil pump pressure relief valve is designed. The very word "reduction" is often used in engineering, denoting the reduction, reduction, easing of something. In our case, this refers to the oil pressure.
Oil pump reduction valve most oftenis located on the cover of this device, which is located in the lower front of the engine block behind the generator drive pulley. Sometimes it can be installed on the body of the oil filter.
There are two types of valves: built-in and demountable. In the first case, the oil pump and the pressure relief valve are a single structure that can not be disassembled. In the second, the pressure control mechanism with the help of the tool is extracted from the pump and can be repaired separately.
How is the oil pump pressure relief valve arranged? Its design is quite simple. It consists of the following elements:
The oil pressure in the system may depend onSeveral factors, but the main one is the number of revolutions of the crankshaft. In other words, the stronger we press the accelerator, the faster the oil pump gears rotate. And the faster the gears rotate, the more oil the pump captures from the crankcase, and the higher its head is at the output.
When the pressure reaches a certain value, the serviceable valve opens slightly, passing oil into the spare channel, through which the lubricant flows back to the crankcase.
Operation of the oil pump pressure relief valveas follows. A piston or a metal ball is pressed against the inlet of the housing by a spring, which in turn is supported by a stop screw. The oil, under the influence of increasing pressure, begins to press on the valve surface, heating it inside the housing and compressing the spring. Thus, an opening is opened, along which the lubricant flows into the reserve channel.
With a decrease in pressure, its magnitude is no longer sufficientin order to keep the valve in the open position, and the ball or piston under the action of the spring again overlaps the inlet. As you can see, the scheme is fairly simple and reliable, however, it sometimes fails.
Reducing valve, oil pump and oilfilter - the main elements of the lubrication system, but if the latter, by virtue of its design, almost never breaks, but only clogs, then the first two parts can fail quite often. The reason for this is usually the use of poor quality oil, a lubricant that does not match the type of engine and the conditions of its operation, as well as its untimely replacement. In this case, particles of dirt, metal shavings or combustion products that are in the grease, settle on the working surfaces of the valve, which, in fact, leads to its clogging and jamming.
Also, the cause of the failure can serve as a spring, if it eventually stretched or, conversely, contracted, twisted, burst.
At once it is necessary to designate that the repairThe oil pump pressure reducing valve is only possible if it has a collapsible design. For non-separable models, the entire pump cover must be replaced.
Defective valve is considered if it is not capablemaintain the necessary pressure in the system, and when its mechanism does not work when the pressure reaches the maximum value. In the first case, to determine the breakdown will be easy - you will be notified by a warning lamp on the car's instrument panel. But you can learn about the increase in pressure only by the oil leaks on the engine.
But how can one understand that the pressure has increased or,on the contrary, has gone down? And how should it generally be? The optimum oil pressure in the system can be found by looking in the user manual. For different brands and models of cars it will be different. For example, the pressure relief valve of the oil pump "Tavria" is activated at 0.55 MPa. Approximately the same indicators are relevant for most Lada cars.
Measure the oil pressure by connecting tosystem special liquid manometer in the pressure sensor seat. Before this, the engine must be warmed to operating temperature. All measurements are taken with the engine running.
Understand whether the pressure relief valve is suitable forfurther exploitation, it is possible, only having dismantled it and having disassembled. So it will be possible to diagnose all its elements. If there are deposits on the valve body, they must be cleaned with gasoline, kerosene or carburetor cleaning fluid. Also, you should carefully inspect the spring. If it has traces of stretching, compression or deformation, it must be replaced.
When you completely overturn the valve, checkits work by simply pressing on the ball (piston). If it is pressed with effort and comes back, locking the channel of the hull, most likely, the mechanism is working.
Adjusting the oil pressure reduction valvepump is carried out after the pressure relief valve is installed in the housing of the device. The process is performed by compressing or releasing the spring by unscrewing (tightening) the thrust screw. At the same time, the oil pressure in the system is measured with a liquid manometer. The adjustment is, of course, carried out with the engine stopped, and the pressure measurement - with the engine running.
Finally, we give some useful tips, which, perhaps, will help to avoid problems with the oil pump pressure reducer, or it will be possible to detect in time its malfunction: