The KamAZ thermostat is designed to automatically maintain the optimal temperature regime of the power unit under various operating conditions. This is facilitated by the redirection of medium flows in the cooling system of the KamAZ engine. On a cold unit, antifreeze moves in a small circle: pump - cylinder block jackets - thermostat - pump. After the coolant reaches 80°C, part of the medium is redirected by the thermostat to the radiator. This circulation pattern is called a great circle.
Where is it located and how is it arranged?
Due to the large volume of the KamAZ engine cooling system, they are equipped with 2 thermostats, which are located in one housing, located on the front wall of the right cylinder block. This arrangement is due to the fact that the coolant is first supplied by the pump to the left cylinder block, and then through the bypass pipe to the right one. Once in the thermostat box, hot antifreeze is directed either to the pump suction (warming up the engine) or to the radiator. The fan, pumping air, takes heat from the coolant. Cooled antifreeze from the lower tank enters the pump suction.
The thermostat is a simple but important device in the engine cooling system. It consists of:
- housings;
- two valves;
- rod;
- cylinder with wax;
- springs.
The principle of operation is based on increasing volume when melting solids. The latter is ceresin, which is a mixture of wax and aluminum powder. The actuators (valve) are fixed to the stem. When starting a cold engine, one of them (the main one) is in the closed position, and the other (the small circle valve) is open.
When the coolant is heated, the wax in the cylinder passes into the liquid phase. Having reached a temperature of 80°C, ceresin displaces the rod, as a result of which the main (upper) valve opens and the small circle valve (lower) closes. Part of the antifreeze enters the cooling radiator. At a coolant temperature of 93°C, the upper valve opens completely. The entire flow is directed to the radiator, because the bottom valve shuts off the liquid supply to the pump suction.
As the coolant cools, the valves begin to move in the opposite direction, and the process repeats. The parameters in the cooling system are automatically maintained.
Main structural details
The KAMAZ 740 cooling system works reliably and is distinguished by its functionality. It has a classic design. If it fails, the vehicle will not be able to operate normally.
The standard cooling system includes the following elements:
Elements of the KamAZ-740 engine cooling system
- water pump;
- radiator;
- thermostats;
- cooling Fan;
- pipes
In KAMAZ it is equipped with two thermostats (in passenger cars - only one). This need is associated with the structural features of the engine. It has two pieces of cylinder heads, which are located at right angles. Another distinctive feature of the engine is the presence of cooling louvres on the radiator. This design element allows you to warm up the engine faster at low ambient temperatures.
Thermostat malfunctions
The main signs of a thermostat malfunction include:
- warming up the engine takes longer than usual;
- there is a problem of engine overheating;
- The speedometer needle starts jumping when accelerating;
- the lower mount of the mechanism always remains warm;
- Euro thermostat valve is leaking;
- The thermostat is closed, but its upper part remains cold when closed.
Damage to the thermostat may be hidden, so it is necessary to carry out regular diagnostics and, if necessary, carry out repair work yourself or at a service station.
Models of Kamaz thermostats
Manufacturers now install various thermostats on trucks. Let's look at their main types:
Electronic thermostat. This is the most modern device, it is installed on advanced versions of KamAZ 6520 and 65115. It does not overheat when the degrees rise, as it has a special thermal resistance device. They usually work with Euro-4 engines. The use of this device significantly reduces fuel consumption. You may notice that KamAZ owners install this type of thermostat on Euro-2, 3 engines.
A two-valve thermostat is usually installed on Kamaz 5320 and 740 models. One device has two valve outputs: main and auxiliary. The main one is designed to ensure the movement of antifreeze in a large circle of circulation. The auxiliary performs a similar function, but on a small circle of revolution. This type is very common on heavy vehicles in the CIS countries.
The two-stage thermostat KAMAZ 43118 also includes two valves in its design. It is installed in devices with increased antifreeze pressure.
Weak spots
Every car cooling system has some weak points. The most common problems in KAMAZ include:
Main malfunctions of KamAZ-740 engines
- occurrence of leaks;
- increase in antifreeze temperature to unacceptable levels;
- supercooling of the coolant;
- penetration of antifreeze into the oil system.
Antifreeze leaks in KAMAZ most often occur at the junction of the pipes. Sometimes this problem occurs due to cracking of rubber hoses. System overheating occurs when the antifreeze level drops sharply. In this case, it is not able to ensure efficient operation of the engine.
Overheating or excessive cooling of the liquid can occur when thermostats fail. It all depends on the position of the valve, which gets stuck, which causes problems. When the thermostat is open, antifreeze is constantly circulating. This prevents the engine from heating up and starting (this is especially noticeable when the blinds are open). When the thermostat is closed, antifreeze does not flow to the radiator, where it cools. Therefore, the coolant in KAMAZ quickly overheats.
Another weak point is the fan and clutch. If it doesn't work efficiently, the engine won't be able to cool enough. Therefore, to prevent problems from occurring, it is necessary to constantly monitor the condition of KAMAZ and promptly eliminate all problems.
Cooling system for Kamaz vehicles
The cooling system provides support for the desired heat regime in the Kamaz engine. The unit is liquid and has a closed, sealed housing. Main elements of the cooling system:
- radiator;
- ventilation system;
- tank with expansion;
- wiring of specialized channels;
- water-based pump;
- thermostatic systems;
- lines for the passage of coolants.
The cooling system design diagram is shown in the figure above: 1 - tank with expansion elements; 2 - pipe for steam outlet; 3 - channel for air release; 4.6 - outlet channel for liquid; 5 - connecting element; 7.9 - pump inlet; 8 - water transformer; 10 — connecting tube between the radiator and the pump; 11 - output element of the device; 12 — tube for fastening; 13 — bypass clamp; 14 — tube for passing liquid into the heating channel; 15 - oil-based heat exchange device; 16 — water-based box; 17 — connection to the compressor; 18 — clamping tube.
A full description of each element is presented on the official Kamaz website.
Rice. 1 — KamAZ compressor (5320-3509015-10) two-cylinder
1 — compressor crankcase; 2 - bearing; 3 — front cover of the compressor; 4 - oil seal; 5 - pulley; 6 — adjusting shims; 7 — compressor cylinder block; 8 — piston with connecting rod; 9 — compressor head; 10 - retaining ring; 11 — bearing; 12 - thrust nut; 13 — rear cover of the compressor crankcase; 14 - seal; 15 — seal spring; 16 - crankshaft; 17 — intake valve spring; 18 — inlet valve; 19 — intake valve guide; 20 — rocker spring; 21 — intake valve rod; 22 — rocker arm; 23 - plunger; 24 — sealing ring; 25 — transport plug.
Cooling System Maintenance
When carrying out maintenance for the Kamaz cooling system, you must first check the coolant tank. It is necessary to check the pipes and possible leaks inside the device. It is necessary to adjust and tighten the ventilation system drive belts.
During ETO the following are carried out:
- amount of liquid in the device;
- checking for tightness.
At TO1:
- the reliability of ventilation fastening is checked;
- the integrity of the radiator is checked;
- parts are lubricated with oil.
At TO2:
- temperature level is checked;
- fastening of system parts;
- the maximum thermal output of the device is checked;
- primary prevention of corrosion formation is carried out.
How to change
Before replacing the thermostat, you will have to perform related dismantling work. To change it, you need to remove the generator belt, loosen the fastening bolts and move the mechanism to the side. Before removing the hose from the radiator pipe, drain 2-3 liters of coolant, dismantle the clamps and carefully pull the corrugation off the fitting. After this, the thermostat box is removed
To replace them, the cover is dismantled. After installing functional parts, the oil seal is replaced and the box is closed. Reinstallation is carried out in reverse order.
Prices
Let's look at how much a thermostat costs for a Kamaz car.
A new complete thermostat box will cost about 6,000 rubles. You should not buy a used part, as it will quickly fail. In addition, it is possible to replace only part of the thermostat box. For such a service, it is better to contact a professional service station.
Has it ever happened to you that the thermostat overheated? How did you get out of the situation: did you do the repairs yourself or go to a repair station?
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Wholesale reinforcement Reinforcement
in bulk to create reinforced concrete structures, which are manufactured directly at reinforced concrete factories or directly at construction sites.
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Modern fittings A500S
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A3 fittings and A500C fittings
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A3 reinforcement and structural strength
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A500S fittings
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Volvo parts
If you are a connoisseur of Scandinavian style and quality, then, undoubtedly, your car is a Volvo.
Volvo S40 is a worthy representative of the world famous Scandinavian brand. Not long ago, this model, considered the most affordable and affordable in the line, was restyled. News 1 - 70 of 539 Home | Prev. | 1 | Track. | End | All
