Reference valve ZMZ 406 Injector. Independently adjust the oil pressure in the ZMZ engines. Path of oil from the pump to the timing unit timing unit

the main / Repairs

Control over the operation of the lubrication system in ZMZ 405, 406 and 409 engines is carried out using special oil pressure sensors. If they are out of order, the driver will not be able to respond in a timely manner for possible malfunctions in the system, which will threaten the further efficiency of the entire power unit.

Pressure sensors and emergency oil pressure ZMZ 405, 406, 409

In order to control the pressure in the SMZ 405, 406 and 409 engines lubrication system, two separate sensors are provided. One of them fixes the pressure value, and the second reacts to its critical fall.

Characteristics, Design and Principle of Oil Pressure Sensor

The oil pressure sensor (DDM) is used to measure the pressure of the lubricant in the system. In the power plants, the ZMZ are used MM358 sensors with the following characteristics:

working element - Pereostat;
rated current, a - 0.15;
working range, kgf / cm 2 - 0-6;
resistance in the absence of pressure, OM - 159-173;

MM358 pressure sensor design consists of:

enclosures with fitting;
membranes;
pusher
rheostat;
reostat drive elements.

The MM358 sensor works along with the pressure pointer located on the car instrument panel. It has an electromechanical design that responds to changing the resistance of the sensor.

The principle of operation of the MM358 sensor is as follows: when the engine does not work, there is no pressure in the lubrication system. The resistance of the sensor, in accordance with its characteristics, is 159-173 ohms. When the power unit is started, the pressure increases, and the oil begins to affect the membrane, bending it inside the case. Beating, it moves through the pusher moving the transmission lever, which, in turn, moves the romper robber to the right, reducing the resistance of the sensor. At this reduction reacts the pointer by moving the arrow to the right.

Characteristics, design and principle of operation of an emergency oil pressure sensor

The emergency sensor is designed to inform the driver about the fall of oil pressure in the system to critical indicators. In the power units of ZMZ 405, 406 and 409, the emergency pressure sensors of the MM111 oil oil pressure are established or similar, manufactured under catalog numbers 2602.3829, 4021.3829, 6012.3829. These are the contact type devices, the principle of operation of which is based on the closure and opening of contacts.

Sensor characteristics mm111d:

working element - diaphragm;
rated voltage, in - 12;
triggering at a pressure, kgf / cm 2 - 0.4-0.8;
the size of the planting thread, in inches - ¼.

Inside the device case is a spring-loaded diaphragm. A contact plate is attached to it, which is not allowed to be closed with a housing (mass) of the sensor. During the operation of the engine, the pressure lubricant enters through a special hole in the case and moves the diaphragm. Contacts are blocked.

The emergency pressure sensor works in a pair with a signaling device, which is located on the instrument panel. It is made in the form of a red maslinka. When we turn on the ignition without starting the engine - the mas cooling should be buried. This suggests that a voltage is supplied to the sensor, and the pressure in the system is missing. After 3-5 seconds after starting the engine, the pressure in the system increases and reaches operating performance. The oil affects the diaphragm, contacts are blocked, and the signaling device goes out.

Where pressure sensors produce

Pressure sensors for ZMZ engines are produced both at the Ulyanovsk Auto Plant and other enterprises specializing in the manufacture of auto parts:

"Auto Cake";
"Bakeard";
"Amy" and others.

Location in power aggregates ZMZ 405, 406, 409

In ZMZ motors, both sensors are identical. You will find them in the left top of the GBC (if you look from the cabin) above the exhaust manifold. And if the emergency sensor can immediately and not see, then the oil pressure sensor is identified instantly along the barrel-shaped case.

Both sensors are screwed into one flooded fitting (tee), which will be screwed into the GBC and is connected to one of the oil channels of the lubricant system. A nutrition wires are connected to the sensors.

How to check oil pressure sensor

If you have a suspicion about the performance of the pressure sensor - do not be lazy to check it. This can be done both at maintenance stations and at home. But in the latter case, you will need to purchase a special pressure gauge. It costs about 300 rubles, but such a thing is useful in the future. In addition to him, a slotted screwdriver will also be required, the key to 22 and the tape.

Verification procedure:

Video: Checking oil pressure in the system

Other malfunctions

However, the deviation in the magnitude of the pressure may be connected with the faults of the wiring, and with the problems of the pointer itself. Do not be lazy to carry out additional diagnostics. Her order is next.

Turn on the ignition. The arrow of the pointer must deviate to the right, and then return to its original position. If the arrow is not deflected, unscrew the screw screwing the screw of the sensor power supply, disconnect it and touch the mass. The arrow dismisted - there is a short circuit in the sensor power supply. If not, the problem should be signed in the pressure indicator.

Checking an emergency oil pressure sensor

To check the device, you will need:

slotted screwdriver;
key to 22;
ommeter (multimeter);
tire pump with pressure gauge;
cut of the hose with codes of the corresponding diameter.

Verification procedure:

How to independently replace in Motors ZMZ 405, 406, 409

Instruments:

slotted screwdriver;
keys at 17 and by 22;
car sealant;
dry rag;
marker.

Replacement procedure:

We disconnect the mass wire from the battery.
We unscrew the screw, pressing the pressure sensor power supply tip. Disconnect the wire.
If you decide to replace both sensors, we unscrew the fastening of the power sensor power supply for the same tool.
In order not to confuse the wires, we mark them with a marker.
The key to 17 is unscrewed the oil pressure sensor. We remove it to the side.
The key to 22 unscrew the emergency oil pressure sensor.
Gently wipe the seats of sensors, remove the remains of the old sealant.
Sensor fittings with a thin layer of automotive sealant. Let him dry a little (30 s).
Screw new sensors using keys at 17 and 22.
Connect the power wires.
We connect the mass to the battery.
Check the operation of the sensors.

Video: Replacing the oil pressure sensor by car "Gazelle"

Whether you will solve the self-diagnosis and replacement of sensors, or resort to the help of specialists - it does not matter. The main thing is to be sure that the lubricant system works in normal mode and to have confirmation in the form of normal indicators of the corresponding devices, rather than counting that everything will cost.

Good day to all. In today's article, we consider a typical problem - the oil pressure in the ZMZ 406 engine is gone. Unfortunately, this is a fairly common problem and typical reasons are quite a lot in the article. We will analyze all the reasons and how they manifest themselves.

Let's start with the description of the design of the GMZ 406 lubrication system:

The oil pump is activated from the intermediate shaft through the hexagon. A reducing valve is installed on the oil pump, which resets an excessive oil pressure back to the crankcase. From the oil pump, the oil through the filter is fed to the main oil line, from which the crankshaft crankshaft are lubricated, and the intermediate shaft sleeve of the timing shaft. Also from the main highway there is a channel in the GBC and to hydraulic fighters. In turn, 2 oil channels parallel to the camshaft are drilled in turn. On these channels, the oil is supplied to each cervical shaft and to each of the 16 hydraulic components.

The most problematic places in the lubrication system are a reducing valve, intermediate shaft sleeves and chain hydrochlorians, but about everything in order ...

Suddenly the oil pressure in the ZMZ 406 was gone.

The reasons in this case are only two - the reduction valve of the oil pump in the open position. He looks like this:

It happens, usually, because of the dirt hitting a reduction valve. Even the slightest crumb clinics the valve and it does not close until the end.

The second typical reason is a breakdown of the oil pump drive.

Looks like a drive like this:

It should be noted that the two of these faults happen extremely rarely and they occur when the oil replacement interval is not survived and during operation on oil is not suitable climate.

Oil pressure in the engine disappeared gradually.

It is the most typical problem, it is associated with natural wear, service periodic and design miscalculations. ....

The most common reason is the oil filter.

During the operation of Gazelles (2705), I changed the filter every 5000 km, and the oil changed 10,000 km. The reason is that when operating on gasoline, the oil quickly darkens and a lot of dirt is formed in it that scores the filter. When operating on gas, such a problem is not observed!

The second most popular reason - gasoline getting into fuel

It is basically the proportion of carburetor versions of 406 of the engine (with a fit of the gasoline pump membrane, gasoline inevitably falls into the oil), but also on an injection engine with a running nozzle is a completely possible script.

The third reason is wear.

Due to wear, gradually, all the gaps in friction pairs increase.

The main place where the pressure is lost - the intermediate shaft. Many do not change the support sleeves of the intermediate shaft, even with major repairs, but it is in these bushings that most of the pressure is lost.
The second place is in popularity - worn hydraulic chains.
The third place is the wear of the CFC and the wear of the distributional shafts. The fact is that on the 406 engine, the bed of distribution shafts are located in the body of the GBC and with the slightest "UVD" plane wear bed increases at times - the result of pressure loss. With the wear of the tree itself increases the gap in the friction pair and the pressure is also lost.
Fourth place - wear of the oil pump. With wear, the pump will not force enough oil into the engine lubrication system and oil pressure will not be. You can fight this by the bulkhead of the pump with the withdrawal of its planes or the replacement of the oil pump assembly on the oil pump from the ZMZ 514 (it is for a diesel engine and has increased performance).
Fifth place - valve gap hydraulic components, compensators in GBC 16 (by number of valves) and at large runs, their bed is also susceptible to wear, but the service life of compensators, as a rule, exceeds the service life of the GBC.

The fourth cause is the springs of the oil bypass valve.

On the oil pump housing, the bypass valve is installed, it opens with high oil pressure. The fact is that over time the springs of the valve weaken and part of the oil pressure is lost on this valve. There is nothing terrible if you lay a pair of washers under the valve spring when bulking the pump.

About the oil radiator.

On some modifications, ZMZ 406 has a radiator for cooling the oil, but in fact, this design is practically not used as it reduces the pressure of the already diluted oil and has low-quality cranes that are constantly running. Relatively literately oil radiator is implemented on the ZMZ 405 (the thermoclap is used) but also there is an effectiveness of questionable. In most cases, it is advisable to drown out the oil radiator and use more thermal stable oil (verified on the personal experience of operation of gas 2705 with mileage of 470,000 km).

Ways to increase oil pressure in the ZMZ 406 engine during operation.

The frequent replacement of the oil filter.
Replacing the oil pump on the pump from ZMZ 514 Part number 514 .1011010
Turning off the oil radiator or replacing it to the heat exchanger.
Replacing the oil on a more thick and high-quality, viscosity is important at high temperatures.
Lining 2-3 Washers under the spring of the oil bypass valve

Ways to increase the oil pressure during major repairs.

Be sure to pull the intermediate shaft and expand the bushings correctly.

Install the jets in the lubrication system.

The fact is that there are several places in the engine where there is a lot of pressure, and to increase the service life of the engine during major repairs it makes sense to drown out some channels in the grease system with greases from the carburetor! The optimal option turned out to be jerks for 2 mm drill.

So, here are these places and options for their gibling:

Oil pump shaft lubrication hole

Hydraulic chains (top and bottom)

I have everything on it. I hope that the problem of missing oil pressure in 406 engine will never twist you.

Inline four-cylinder engine, equipped with a complex microprocessor
The fuel injection and ignition control system (CMSud).

View of the mod engine. 4062 on the left side:

1 - drain plug;
2 - Oil Carter;
3 - exhaust manifold;
4 - Engine Support Bracket;
5 - Crane of the drain of coolant;
6 - water pump;
7 - Cooling overheating lamp sensor
liquids;
8 - Cooling temperature indicator sensor
liquids;
9 - temperature sensor;
10 - thermostat;
11 - emergency lamp sensor
oil pressure;
12 - Pressure pointer sensor
oils;
13 - Carter ventilation hose;
14 - pointer (probe) oil level;
15 - ignition coil;
16 - phase sensor;
17 - heat insulating screen
The cylinder block is cast from gray cast iron. Between the cylinders there are channels for
Coolant. Cylinders are made without plug-in sleeves. At the bottom of the block
There are five supports of the crankshaft root bearings. Indigenous caps
Bearings are made of carpet cast iron and are attached to the block with two bolts. Covers
Bearings are mounted together with the block, so they cannot be changed in places.
On all covers, except for the lid of the third bearing, their sequence numbers are knocked out.
The lid of the third bearing in conjunction with the block is processed to the ends for installation
Hemisphere of a stubborn bearing. To the ends of the block bolts are brought out the lid of the chain and
Swipers with crankshaft cuffs. Oil Carter is mounted below the block.
From above on the block installed a head block of cylinders, cast from aluminum
Alloy. It has intake and exhaust valves. For each cylinder
Four valves are installed, two intake and two graduation. Inlet valves
Located on the right side of the head, and the graduation - with the left. Valve drive
It is carried out by two camshafts through hydraulic pushers.
The use of hydrotherapists eliminates the need to adjust the gaps in the drive
valves, as they automatically compensate for the clearance between cams
Switching shafts and valve rods. Outside on the housing of the hydrotrode
There is a groove and a hole for supplying an oil inside the hydrothelter from the oil
Highway.

View of the mod engine. 4062 on the right side:

1 - synchronization disk;
2 - Sensor of rotation and synchronization frequency;
3 - oil filter;
4 - starter;
5 - detonation sensor;
6 - coolant drain tube;
7 - air temperature sensor;
8 - inlet tube;
9 - receiver;
10 - ignition coil;
11 - idle regulator;
12 - choke;
13 - Hydraulic chain;
14 - generator
The hydrotrode has a steel housing, inside which the guide is welded
sleeve. In the sleeve installed a compensator with a piston. The compensator is held in
The sleeve is a locking ring. Between the compensator and the piston, the expansion
spring. The piston rests on the bottom of the housing of the hydrotrode. At the same time
The spring presses the housing of the reverse ball valve. When the cam
The camshaft does not press the hydrotrode, the spring presses through
Piston Housing of the hydrotrode to the cylindrical part of the camshaft
shaft, and the compensator - to the valve rod, choosing the gaps in the drive
valves. The ball valve in this position is open, and the oil enters
Hydraulicator. As soon as the camshaft camshaft turn and pressed
The housing of the pusher, the housing drops down and the ball valve closes. Butter,
located between the piston and the compensator, begins to work as a solid body.
The hydrotrode under the action of the camshaft camshaft moves down and opens the valve.
When the cam turning, ceases to put pressure on the body of the hydrotrode, he
Spring action moves up, opening a ball valve, and the whole cycle
Repeated again.

Cross section of the mod engine. 4062.

1 - Oil Carter;
2 - oil pump receiver;
3 - oil pump;
4 - Oil pump drive;
5 - the gear of the intermediate shaft;
6 - block of cylinders;
7 - inlet tube;
8 - receiver;
9 - inlet camshaft
valves;
10 - inlet valve;
11 - valve cover;
12 - distributional graduation
valves;
13 - oil level index;
14 - hydraulic valve pusher;
15 - external valve spring;
16 - valve guide sleeve;
17 - exhaust valve;
18 - head block of cylinders;
19 - graduation collector;
20 - piston;
21 - piston finger;
22 - rod;
23 - crankshaft;
24 - connecting rod;
25 - indigenous bearing cover;
26 - drain plug;
27 - the housing of the pusher;
28 - guide sleeve;
29 - compensator case;
30 - lock ring;
31 - the piston of the compensator;
32 - ball valve;
33 - Spring Ball Valve;
34 - Ball valve case;
35 - Scroll Spring
In the head of the block with a large tension set saddles and guides
valves. In the lower part of the block head, combustion chambers are performed in the top -
Located distribution shafts. On supports installed aluminum
Covers. The front cover is common to the intake and graduation supports.
Distributional shafts. This lid have plastic stubborn
Flanges that are included in the grooves on the neck of the camshafts. Covers
Milk together with the head of the block, so they cannot be changed in places. On the
All covers, except the front, are knocked out sequence numbers.

Distributional shafts setting circuit

Distributional shafts are cast from cast iron. Fork profiles inlet and graduation
Shafts are the same. Fists are shifted by 1.0 mm relative to the axis of the hydrothels that
When the engine is running, makes them rotate. This reduces surface wear
The hydrotherapist makes it uniform. From above the block of the block is closed with a lid,
cast from aluminum alloy. Pistons are also cast from aluminum alloy. On the
Piston's donkey made four recesses under the valves that prevent
Piston blows on valves with violation of the phases of gas distribution. For proper
Piston settings in the cylinder on the side wall at the battlefield under the piston finger
Inscription: "Before." The piston is installed in the cylinder so that this inscription
Adds to front of the engine.
On each piston are installed two compression and one oil slim ring.
Compression rings are cast from cast iron. Bochemy work surface top
The rings are covered with a layer of porous chromium, which improves the arrival of the ring. Working
The surface of the lower ring is covered with a layer of tin. On the inner surface of the lower
Rings there is a flow. The ring should be installed on the piston of this groove
up, to the bottom of the piston. The oil lifting ring consists of three elements: two
Steel disks and expander. The piston is attached to the connecting rod with a piston
Finger "Floating Type", i.e. The finger is not fixed in either piston, nor in the connecting rod. From
moving a finger is held by two spring retaining rings that
Installed in the grooves of the beetles of pistons. Steel rods forged, with a rod
I-beam section. Bronze sleeve is pressed into the top head of the rod.
The lower head of the connecting rod with a lid, which is attached by two bolts. Split nuts
Bolts have self-adjustable threads and therefore do not stop.
Connecting rods are processed together with connecting rod, and therefore they can not
Rearrange from one rod to another. On connecting rods and covers of rods
Cylinders. To cool the bottom of the oil piston in the rod rod and the top head
Holes are performed. Mass of pistons collected with connecting rods should not be different
More than 10 g for different cylinders. In the lower head of the connecting rod
Sound-walled connecting rod liners. The crankshaft is cast from high strength cast iron.
The shaft has eight counterweights. From the axial movement it is kept resistant
The hemisphere installed on the middle neck. To the rear end of the crankshaft
Attached flywheel. Insertion sleeve and bearing inserted in the flywheel
Primary shaft gearbox.
On connecting rods and covers, the cylinders are knocked out. For cooling the bottom
Piston with oil in the rod rod and the top head holes are performed. Weight
pistons collected with connecting rods, should not be different by more than 10 g for different
Cylinders. In the lower head of the connecting rod, thin-walled connecting rod
Inserts. The crankshaft is cast from high strength cast iron. The shaft has eight
counterweights. From the axial movement it is held by persistent hemisphere,
Mounted on medium neck. To the rear end of the crankshaft attached
flywheel. In the opening of the flywheel, the spacer sleeve and the primary bearing
Shaft gearbox.

The lubrication system is combined, with oil supply to rubbing surfaces under pressure and spraying and automatic adjustment of the temperature of the oil with thermoclap. Hydraulic valve pushers and chain tensioners are lubricated and performing their functions under pressure oil.

The lubrication system includes: oil crankcase, oil pump with a receiving nozzle and a reduction valve, the oil pump drive, oil channels in the cylinder block, cylinder head and crankshaft, a full-flowered oil filter, a rod oil level pointer, a thermoclasp, oil-free cover, oil drain plug And oil pressure sensors.

Oil circulation occurs as follows.

Pump 1 sucks the oil from Carter 2 and over the channel of the cylinder block leads it to the thermoclap 4.

With an oil pressure of 4.6 kgf / cm 2, a reduction valve 3 of the oil pump and an oil is opened back into the pump suction zone, which reduces the pressure growth in the lubrication system.

The maximum oil pressure in the lubrication system is 6.0 kgf / cm 2.

With an oil pressure above 0.7 ... 0.9 kgf / cm 2 and temperatures above, plus 81 + 2 ° C The thermoclap begins to open the passage of the oil flow into the radiator allocated through the fitting 9.

Temperature of the full opening of the thermoclap channel - plus 109 + 5 ° C. The cooled oil from the radiator returns to the oil crankcase through the hole 22. After the thermoclap, the oil comes to the full-flow oil filter 6.

The purified oil from the filter enters the central oil line 4 of the cylinder block, from where through the channels 18 is supplied to the native bearing of the crankshaft, through the channels 8 to the bearing of the intermediate shaft, through the channel 7 - to the upper bearing of the oil pump drive roller and is also supplied to the hydraulic power plate of the lower Switching shaft drive chains.

From the indigenous bearings, the oil through the internal channels 19 of the crankshaft 20 is summed up to connecting rod bearings and from them through channels 17 in the connecting rods to lubricate piston fingers.

To cool the piston, the oil through the hole in the top head of the connecting rod is splashing on the bottom of the piston.

From the upper roller bearing oil pump drive Oil through transverse drills and the inner cavity of the roller is supplied to lubricate the lower roller bearing and the supporting surface of the drive gear drive.

The gear of the oil pump drive is lubricated by the jet oil sprayed through the hole in the central oil line.

From the central oil line, the oil through the channel 10 of the cylinder block is entered into the cylinder head, where the channels of the distribution shafts are supplied to the channels of the distribution shafts, through channels 14 to the hydrothels of the upper chain of the camshaft drive.

Summary from the gaps and stained in the oil crankcase in the front of the cylinder head, the oil falls on the chains, levers of stretch devices and sprockets of the camshaft drive.

In the back of the cylinder head, the oil flows into the oil crankcase along the head opening through the hole in the bond of the cylinder block.

Oil pouring into the engine is carried out through the oil-free valve cover, closed with a lid 13 with a sealing rubber gasket.

The oil level is controlled by the labels-applied in the index 21: top-level - "max" and bottom - "min".

The oil drains is performed through the hole in the oil crankcase, closed with a drain plug 23 with a sealing gasket.

Oil cleaning is carried out by a mesh installed on a fuel oil pump with filtering elements of a full-flow oil filter, as well as centrifuging in the crankshaft channels.

Control over the pressure of the oil is carried out by an analogue of an emergency pressure of the oil (the test lamp on the instrument panel), the sensor 16 of which is installed in the cylinder head.

An emergency pressure warning device lights up with a decrease in oil pressure below 40 .. .80 kPa (0.4 .. .0.8 kgf / cm 2).

Oil pump - Gear-type, installed inside the oil crankcase, is attached with a gasket with two bolts to the cylinder block and the holder to the lid of the third root bearing.

The drive gear 1 is fixed on roller 3 with a pin, and driven 5 freely rotates on the axis 4, pressed in the case 2 of the pump.

At the upper end of the roller 3, a hex hole was made, which includes a hex roller of the oil pump drive.

The centering of the driving roller of the pump is carried out by landing the cylindrical protrusion of the pump housing in the holes of the cylinder block.

The pump housing is cast from aluminum alloy, partition 6 and gears are made of metal ceramics.

To the body three screws is molded by casting aluminum alloy the receiving nozzle 7 with the grid in which a reduction valve is installed.

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Reduction valve - plunger type, located in the receiving nozzle of the oil pump. The valve plunger is steel, to increase the hardness and wear resistance of the outer working surface subjected to nitro cement.

The reducing valve is adjusted at the plant selection of washers 3 specific thickness. The valve adjustment is not recommended.

Oil pump drive - It is carried out by a pair of screw gears from the intermediate shaft 1 of the camshaft drive.

On the intermediate shaft with a segment key 3 installed and pinned with a flanged nut the drive gear 2.

The steel sleeve 6, having an internal hex hole, pressed into the upper part of the driven gear.

The hexagon roller 9 is inserted into the hill of the sleeve, the lower end of which is included in the hex hole of the oil pump roller.

From above, the oil pump drive is closed with a lid 4 fixed through the gasket 5 four bolts.

The driven gear during rotation of the upper end surface is pressed against the drive lid.

The leading and driven screw gears are made of high-strength cast iron and nitrate to improve their wear resistance.

The hexagon roller is made of alloy steel, and carbon monazoted. Roller drive 8 steel, with a local hardening of the reference surfaces of high frequency currents.

Oil filter - Multiple-current oil filters of a single use of an indiscriminate structure are installed on the engine.

Filters 2101c-1012005-NK-2 and 406.1012005-02 are equipped with a filtering element of the bypass valve that reduces the likelihood of increasing oil into the lubrication system when the cold engine starts and the limit contamination of the main filter element.

Oil cleaning filters 2101c-1012005-NK-2 and 406.1012005-02 are described as follows: Oil through the holes in the cover 7 under pressure is supplied to the cavity between the outer surface of the main filtering element 5 and the housing 2, passes through the filtering slope of the element 5, cleared and falls Through the central opening of the cover 7 to the central oil housing line.

With the limit contamination of the main filtering element or a cold start, when the oil is very thick and with difficulty passes through the main filter element, the bypass valve 4 and the engine oil is opened, cleaning the filtering element 3 of the bypass valve.

The centered valve 6 prevents the flow of oil from the filter when parking the car and the subsequent "oil starvation" when started.

The filter 406.1012005-01 is arranged similarly to the oil filters presented above, but does not contain a filter element 3 of the bypass valve.

The oil filter is subject to replacement at T-1 (every 10,000 km of run) simultaneously with the change of oil.

Thermoclap - Designed for automatic feed adjustment

oils in the oil radiator depending on the temperature of the oil and its pressure. On the engine, the thermal valve is set between the cylinder block and the oil filter.

The thermal flag consists of a housing 3, cast from an aluminum alloy, two valves: a safety consisting of a ball 4 and springs 5, and a bypass, consisting of a plunger 1 controlled by a thermosular sensor 2, and spring 10; Threaded plugs 7 and 8 with gaskets 6 and 9. The oil supply hose into the radiator is connected to the section 11.

From the oil pump, the oil is fed under pressure to the cavity of the thermoclapana A. At the pressure of the oil above 0.7 ... 0.9 kgf / cm, the ball valve opens, and the oil enters the body of the thermoclap body b to the Plunger 1.

When the temperature of the oil 81 ± 2 ° C is reached, the piston of the thermosular element 2 is washed by the flux of hot oil, it begins to move the plunger 10, opening the path of the oil from the channel b to the oil radiator.

The ball valve protects the driving parts of the engine from an unnecessary drop in the oil pressure in the lubrication system.