UAZ COOLING SYSTEM
I Upper radiator tank
2. Radiator cap
3. Connecting hose
expansion tank
4. Connecting hose
cooling radiator
5. Fan belt
6. Thermostat bottle
7. Outlet pipe
8. Tank cover
9. Expansion tank
10. Mounting bracket
expansion tank
C System pump gasket
cooling
12 Distribution pipe
cooling systems
13. Sleeve
R Cooling jacket
engine block
15. Cooling system jacket
engine block heads
16. Impeller
17. System pump bracket
cooling
18. Tp>fia connecting
19. Connecting hose
abducting
20. Bracket
2L Radiator valve
22. Suspension cushions
radiator
23. Frame cross member
24. Crane control rod
radiator
25. Fan shroud
26. Cooling radiator
27. Control rod shell
blinds
28. Radiator shutters
29. Control bracket
curtains blinds
30. Mounting side
curtain blinds
3L Blind curtain
32. Blind control handle
33. Fan pulley
34. System pump housing
cooling
35. Fan
36. Temperature indicator sensor
coolant
37.
38.
39.
40.
4L
42.
43.
44.
45.
46.
47.
48.
49.
50.
5L
52.
53.
54.
55.
56.
57.
58.
59.
60.
I.
37. Indicator lamp (red)
emergency overheating
coolant
38.Temperature indicator
coolant in the block
engine cylinders
39. Warning lamp sensor
cooling temperature
fluid in the radiator
40.Radiator mounting bracket
41. Radiator mounting rod
42.Bracket for fastening the rod on
side of the hood
43.Exhaust valve
44.Intake valve
45. Thermostat bypass channel
46.Thermostat housing
47.Thermostat valve
48.Hub
49.Water pump roller
50. Front bearing
51. Spacer sleeve
52. Control hole
53. Rear bearing
54. Press - oiler
55.Spring
56.Cuff ring
57.Cuff
58.Cuff clip
59. Sealing washer
60. Retaining ring
I. Radiator suspension diagram
cooling
II. Radiator Mount
cooling on the body
III. Coolant pump
IV. Coolant circulation diagram
liquid ajar
thermostat valve
V. Coolant circulation diagram
liquid when closed
thermostat valve
VI. Plug valve operation diagram
radiator:
A - with high blood pressure
fluids in the system
B - when there is a vacuum in the system
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Radiator……………………………………………………………………..tubular-ribbon with three rows of tubes
Thermostat…………………………………………………………………….. a non-separable, heat-sensitive element with a solid filler.
Start of valve opening at 68-72 ‘C Full valve opening
at 81-85°C
Coolant………………………………………………………low-freezing liquid Antifreeze A-40M, Antifreeze A-65M or water
MAINTENANCE
Avoid getting coolant into the oil when removing the head or for other reasons, as this causes resinization of the oil, which
can lead to coking and loss of mobility of the pushers, resin deposits and blocking of small holes supplying lubricant to
rubbing surfaces.
Maintenance of the cooling system consists of removing scale and sediment from it, adjusting the tension of the fan belt and
lubricating the bearings of the cooling system pump, as well as flushing the radiator from the outside.
Flush the cooling system once a year before the summer operating season.
Remove scale from the cooling system by flushing it with a strong stream of clean water. Wash the engine separately from
radiator so that rust, scale and sediment from the engine cooling jacket do not clog the radiator. Before flushing the engine, remove
remove the thermostat and disconnect the hoses from the radiator.
Adjust the fan belt tension by turning the generator. The normal deflection of the belt should be 8 - 14 mm when pressing it with
with a force of approximately 4 kgf.
Check the operation of the thermostat simultaneously with flushing the cooling system, as well as in case of systematic overheating of the engine
(with proper operation of the power supply and ignition systems).
To check, place the thermostat together with a thermometer in a vessel with water heated to a temperature of 90 - 100 'C. Then, with gradual
When cooling the water, monitor the starting (80 ± 2 °C) and closing temperature (70 ± 2 *C) of the thermostat valve. Faulty thermostat
replace with a new one.
When checking the thermostat, pay attention to the cleanliness of the valve disc. Remove scale and dirt from the surface of the thermostat with a wooden
spatula, then rinse in water.
You can also check the serviceability of the thermostat by heating the inlet pipe of the upper radiator tank when the engine warms up. Pfi
If the thermostat is faulty, the pipe warms up immediately after starting the engine; if the thermostat is working properly, the pipe warms up after the temperature of the water in the block
will reach 60 - 70 ‘C (according to the coolant temperature indicator on the instrument panel).
Lubricate the bearings of the cooling system pump after 16,000 km (Litol-24, Lita, Litol-24RK).
Lubricate the bearings through the grease nipple until the grease comes out of the inspection hole. Remove excess grease as it may
get on the fan belt and damage it.
Check the blinds for completeness of opening with the drive handle pushed in all the way.
Drain the liquid from the engine cooling system through two taps. One of them is located on the lower radiator tank, the other on
cylinder block. When draining, remove the radiator cap and open the heater shut-off valve located on the block head
cylinders
On vehicles of the UAZ-3741 family, a high-performance heater with a drain valve can be installed
fluids from the heating system. When draining, it is necessary to open the valve on the heater drain hose.
The importance of the cooling system on all vehicles is endless. The main purpose of this system is to remove high temperature from the engine in order to prevent it from rising above a critical level. After all, an increase in temperature above normal will lead to irreparable consequences that will entail the need for major repairs. But let’s not talk about sad things and let’s look at what the cooling system on the UAZ Patriot is, what its features are and what it consists of.
Device Features
The cooling system on each car is a separate unit, which consists of main components. These main components on the UAZ Patriot car include the following elements:
- radiator;
- water pump;
- thermostat;
- expansion tank;
- coolant;
- fan;
- hoses and tubes.
UAZ vehicles of Euro-3 and Euro-4 environmental standards are equipped with closed-type cooling systems, the functioning of which is ensured by the circulation of antifreeze or antifreeze. This liquid is the main reagent that removes heat from the engine.
The cooling system also includes heater radiators and an electric pump that supplies fluid to these products. The UAZ Patriot Euro-3 is equipped with one heater radiator, and its descendant Euro-4 is already equipped with two devices. The photo below shows a diagram of the design of the cooling system, which displays a complete list of working elements.
The diagram displays not only a list of the main elements of the unit, but also the path of fluid passage. Thanks to such a diagram, you can roughly imagine the structure of the system and the principle of its operation. If we touch on the principle of operation of the unit, it is as follows:
- Since the system is closed, pressure is created in it. Pump 16 is directly involved in creating pressure.
- The pump operates thanks to the torque from the SUV engine shaft.
- The pump directs the liquid into a special jacket, where heat is transferred from the engine to the coolant.
- From the jacket, the liquid enters an element such as thermostat 6, which is involved in the distribution of cold and hot liquid flows. If the fluid is at a high temperature, the thermostat directs it to the radiator for cooling, and if it is cold, then to the water pump.
Thus, the cooling system of the Patriot engine and, in fact, most modern vehicles operate. Therefore, this scheme is appropriate for other cars.
If it is necessary to increase the temperature in the cabin, the driver activates a special heater switch, thereby opening coolant access to heater radiators 1 and 2. Pump 3 begins to pump pressure into the cabin heating structure, thereby accelerating the circulation of liquid through the radiators. The diagram displays all the processes, so understanding it will not be difficult.
On UAZ Patriot Euro-3, the cooling system is supplied from the factory with A40M or A60M antifreeze. Patriots of the new standard are filled with both antifreeze and antifreeze. The difference between these liquids lies in the composition and does not play a big role in the process of heat removal.
Fan
A radiator is a container in which liquid is cooled. But it is impossible to cool the liquid without such an element as a fan, so its presence is mandatory. The fan serves in the cooling system to increase the intensity of the coolant temperature reduction in the radiator. In Patriots, the fan is driven by a belt drive from a viscous coupling. This type of device drive is hydraulic, as it is controlled by fluid in a fluid coupling. But such a fan has many disadvantages, so SUV car owners often resort to engine conversion by In particular, the disadvantages of the hydraulic drive of the device include the following factors:
- The load on the engine increases as the viscous clutch is driven by the crankshaft.
- Instability of fan operation, since the speed of rotation of the blades directly depends on the number of revolutions of the crankshaft.
- Inability to turn on the fan when necessary.
Therefore, in frequent cases, drivers install electric fans, which are very popular in the system.
Unfortunately, even modern SUVs from the Ulyanovsk plant are equipped with radiator cooling fans, which are driven by a viscous coupling. The disadvantages of a viscous coupling include the high cost of the product, since the unit is a whole unit.
In conclusion, it should be noted that the high temperature removal system of a car is very important for it, be it a diesel engine or a gasoline one. After all, in any case, they need to remove high temperature in order to avoid the possibility of engine jamming. Therefore, it is very important for every owner of any car to monitor the proper operation of this unit in order to prevent malfunctions. Otherwise, untimely stopping of the engine when the temperature rises above 100 degrees can be fatal for both the engine and the driver.
You can check your BMR and if you need to reduce it!
The engine cooling system is liquid, closed, with forced circulation of coolant by a centrifugal pump.
The coolant is supplied to the cooling jacket of the cylinder block.
Low-freezing liquid OZh-40 “Lena”, TOSOL-A40M or water are used as a coolant.
At ambient temperatures below minus 40 °C, coolant-65 “Lena”, TOSOL-A65M should be used.
For normal engine operation, the coolant temperature must be maintained within 70–90 °C. This is accomplished by a thermostat, which automatically regulates the amount of fluid flowing through the radiator, and louvres, which regulate the amount of air cooling the radiator.
In cold weather, the cooling system must be protected with an insulating cover with a folding valve.
The coolant temperature is controlled by a temperature gauge located on the instrument panel and connected by an electrical wire to a temperature sensor screwed into the thermostat housing.
In addition, overheating of the coolant is indicated by a lamp with a red filter installed on the instrument panel and connected by an electrical wire to a temperature sensor screwed into the upper radiator tank.
Signal lamp lights up when the coolant reaches a temperature of 91–98 °C.
The causes of overheating may be: low fluid level in the radiator, weak fan belt tension, driving with the blinds closed and the insulating cover valve closed.
If the warning light comes on, the cause of the overheating must be immediately identified and eliminated.
Pump 421.1307010–01– centrifugal type, driven by a V-belt from the crankshaft pulley.
The pump design uses a ball-roller bearing, manufactured integrally with the pump shaft.
The bearing has special seals that ensure preservation of the lubricant incorporated during manufacture. The bearing does not require additional lubrication during operation.
Thermostat– with solid filling, placed in the case.
Operating the engine without a thermostat is unacceptable, because when the thermostat is removed, the main fluid flow will circulate through a small circle of the cooling system, bypassing the radiator, which will lead to engine overheating.
When servicing the engine cooling system of model 414 and model 4178 (pre-1999* production), it is necessary to take into account their design features: *
By the end of 1999, it is planned to completely switch to the production of model 4178 engines with coolant supplied to the cooling jacket of the cylinder block - coolant is supplied to the cylinder head;
– the pump (21–1307010–52) of the cooling system has two ball bearings. Lubricate the bearings according to the instructions in the lubrication table.
Lubricate the bearings through the grease nipple until the grease comes out of the inspection hole. Remove excess grease, as it can get on the fan belt and damage it;
– the coolant temperature control sensor is screwed into the cavity of the cooling system pump;
– The thermostat is installed in the outlet pipe.
Avoid getting coolant into the oil when removing the head or for other reasons, as this causes resinization of the oil, which can lead to coking and loss of mobility of the pushers, resin deposits and blocking of small holes supplying lubricant to the rubbing surfaces.
Maintenance of the cooling system involves removing scale and sediment from it, adjusting the tension of the fan belt, and also flushing the radiator from the outside.
Every three years or every 60,000 km (whichever comes first), flush the cooling system and replace the coolant with new one.
Flush the cooling system as follows:
– fill the system with clean water, start the engine, let it run until it warms up, with the engine idling, drain the water and turn off the engine;
– After cooling the engine, repeat the above operation.
Rice. 1. Flushing the cooling system
If there is significant deposit of scale and sediment, remove them from the cooling system by flushing with a strong stream of clean water.
Wash the engine separately from the radiator (Fig. 1) so that rust, scale and sediment from the engine cooling jacket do not clog the radiator.
Before flushing the engine, in this case, remove the thermostat and disconnect the hoses from the radiator.
To better clean the cooling jacket of the cylinder block, unscrew the drain cock along with the fitting from the cylinder block.
Flush the cooling jacket until the water leaving the engine is clear. Do not use alkaline solutions to wash the cooling jacket, as they cause corrosion of the cylinder head and block.
Rinse the radiator with the cap closed, first supplying water to the upper pipe to remove sediment from the lower tank first, and then to the lower pipe.
Flush until the water coming out of the upper tank is clear. At the same time, rinse the radiator core with a stream of water and blow out compressed air.
If there are significant scale deposits in the radiator tubes, do the following:
1. Remove the radiator from the car and fill it with a 10% solution of sodium hydroxide (caustic soda), preheated to a temperature of 90 °C.
2. After 30 minutes, drain the solution from the radiator.
3. Rinse the radiator with hot water in the direction opposite to the coolant circulation in the engine (see Fig. 1) for 30–40 minutes under a pressure of no more than 49 kPa (0.5 kgf/cm2).
Rice. 2. Checking the fan belt tension
Adjust the fan belt tension by turning the generator.
The normal deflection of the belt should be 8–14 mm when pressed with a force of approximately 4 kgf (Fig. 2).
Check the operation of the thermostat simultaneously with flushing the cooling system, as well as in the event of systematic overheating of the engine (if the power supply and ignition systems are working properly).
To check, place the thermostat together with a thermometer in a vessel with water heated to a temperature of 90–100 °C.
Then, as the water gradually cools, monitor the temperature of the beginning (80±2) °C and the end of closing (70±2) °C of the thermostat valve.
Replace the faulty thermostat with a new one.
When checking the thermostat, pay attention to the cleanliness of the valve disc. Remove scale and dirt from the surface of the thermostat with a wooden spatula, then rinse in water.
You can also check the serviceability of the thermostat by heating the inlet pipe of the upper radiator tank when the engine warms up.
If the thermostat is faulty, the pipe warms up immediately after starting the engine; if it is working properly, it will warm up after the water temperature in the block reaches 60–70 °C (according to the coolant temperature indicator on the instrument panel).
Check the blinds for complete opening with the drive handle pushed in all the way.
If the blinds do not open completely, adjust them as follows:
1. Loosen the screw securing the drive rod in the articulated coupling of the lever located on the blinds.
2. Open the blinds completely by turning the drive lever counterclockwise.
3. Push the blind drive handle all the way.
4. Secure the drive rod in this position in the articulated coupling of the lever.
5. Close and open the blinds several times in a row, then check the complete opening of the blinds with the handle pushed in all the way and their complete closing with the handle pulled out.
If the drive handle moves with great force, lubricate the axes of the blinds and the rod.
Lubricate the valve axes with motor oil, and the rod, after removing it from the shell, with Litol-24 lubricant.
The rod can be lubricated with an easily penetrating lubricant consisting of 60% colloidal graphite concentrate in mineral oil and 40% white spirit. Apply lubricant to the rod casing.
Rice. 3. Fan drive clutch
Engines of models 4218 and 4178 can be equipped with a viscous fan drive coupling (Fig. 3), which reduces fuel consumption, reduces fan noise, and also helps warm up a cold engine and maintain engine thermal conditions within optimal limits.
The outer surface of the coupling should be kept clean to ensure the removal of heat generated during the operation of the coupling and the normal operation of the bimetallic valve spring.
The clutch is turned on and off automatically.
If the clutch stops working, disconnect the clutch from the hub (the connection between the clutch and the hub has a left-hand thread), remove the fan, unscrew the two fan mounting studs from the clutch body, drain the working fluid through the holes in the studs and thoroughly rinse the inner cavity of the coupling with gasoline.
Let the gasoline drain completely, then pour 40 g of polymethylsiloxane liquid PMS-10000 TU 6-02-737-78 into the coupling through one of the holes. The second hole should be open for air to escape.
After this, screw the studs into the housing, secure the fan and install the coupling on the hub of the cooling pump pulley.
Drain the liquid from the engine cooling system through two taps. One of them is located on the lower radiator tank, the other on the cylinder block. When draining, remove the radiator cap.
The cooling system of the UAZ Patriot is liquid, closed, with forced circulation of coolant. The UAZ cooling system must be filled with low-freezing liquid Tosol-A40M, OZh-40 “Lena” or. At ambient temperatures below minus 40 degrees, it is necessary to use Tosol-A65M low-freezing liquid.
Cooling system of UAZ Patriot with ZMZ-409 engine, design and design features.
The UAZ cooling system consists of an engine cooling jacket, a radiator, a water pump, a thermostat, an expansion tank, a viscous fan drive coupling, an electric fan, connecting hoses and tubes. The cooling system is also connected to heater radiators and an electric pump for the additional interior heater. The pressure in the system is created by a water pump, which is driven by a belt from the crankshaft.
Cooling system of UAZ Patriot with ZMZ-409 Euro-2 and ZMZ-40904 Euro-3 engines.
Cooling system of UAZ Patriot with ZMZ-40905 Euro-4 engine.
From the pump, the liquid is supplied to the engine cooling jacket, and from the jacket it enters a two-valve thermostat with an opening temperature of the main valve of 82+-2 degrees. Depending on the temperature, the coolant then passes into the water pump, at a low temperature, or into the radiator, at a high temperature, and then, after cooling, enters the water pump.
The radiator of the cooling system is tubular-band or with horizontal tubes, aluminum, with brackets for attaching the radiator to the body radiator lining. The expansion tank is plastic, connected by radiator pipes to the thermostat and closed with a screw plug with a valve that maintains excess pressure in the system.
The coolant drain valve or plug is located on the left side of the engine block. Cooling system capacity including the heater: with a tubular band radiator - 12.0 liters, with a radiator with horizontal tubes - 14.0 liters.
Operating temperature of the coolant in the UAZ Patriot cooling system.
Engine coolant operating temperature ZMZ-409 Euro-2 and ZMZ-40904 Euro-3 should be between 80-105 degrees. Short-term engine operation, no more than 5 minutes, is allowed when the coolant temperature rises to 109 degrees.
Engine coolant operating temperature ZMZ-40905 Euro-4 should be between 80-110 degrees. Short-term engine operation, no more than 5 minutes, is allowed when the coolant temperature rises to 120 degrees. If the coolant overheating warning light comes on, you must immediately stop the engine and eliminate the cause of the overheating.
Engine temperature control is carried out using a temperature indicator and an overheating indicator (control lamp) located in the vehicle instrument cluster. The coolant temperature indicator is controlled by a signal generated by the control unit based on information from the temperature sensor located in the thermostat housing.
Replacing engine oil and oil filter ZMZ-409...
