Pump VAZ 2107: purpose, malfunctions, repair and replacement
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Pump VAZ 2107: purpose, malfunctions, repair and replacement

VAZ 2107 in Russia is a fairly popular car, due to its unpretentiousness and ease of operation. However, in this machine there are many nodes that require periodic attention for the purpose of prevention or repair work, and the pump is one of those.

Pump VAZ 2107

On vehicles with a liquid cooling system, including the VAZ 2107, one of the main elements responsible for maintaining the operating temperature of the engine is the pump. Thanks to this node, the circulation of the coolant is ensured. If problems arise or if the water pump fails, the normal operation of the power unit is disrupted, which can lead to serious consequences and costly repairs.

Pump VAZ 2107: purpose, malfunctions, repair and replacement
The pump circulates the coolant through the engine cooling system

appointment

The operation of the pump is aimed at the continuous circulation of the coolant (coolant) through the engine cooling jacket. The antifreeze is heated under the influence of the rubbing elements of the power unit, and the necessary pressure in the system is created by means of a water pump. The liquid is directly cooled in the main radiator, after which the coolant again enters the cooling jacket. If the circulation is interrupted for at least 5 minutes, the motor will overheat. That is why it is so important to monitor the correct operation of the node in question.

More about the VAZ 2107 radiator: https://bumper.guru/klassicheskie-modeli-vaz/sistema-ohdazhdeniya/radiator-vaz-2107.html

Pump design

On the VAZ 2107, as on many other cars, the pump has almost the same design. The unit consists of a housing with a central shaft located inside, on which the impeller is fixed. The shaft is fixed against axial displacement by means of a bearing, and the tightness of the structure is ensured by an oil seal that prevents coolant from flowing out. There is a hole in the pump cover through which the shaft comes out, where the pulley hub is attached to it, and then the pulley itself. A belt is put on the latter, which on the “seven” rotates the generator and pump from the crankshaft. On modern cars, the pump rotates through the timing belt.

Pump VAZ 2107: purpose, malfunctions, repair and replacement
The main elements of the pump are the housing, the shaft with the bearing, the impeller and the stuffing box.

Where is

On the classic Zhiguli models, the pump is located on the front of the power unit and is attached not to the block, but through a separate housing. Opening the hood, you can easily see both the pump pulley and the assembly itself.

Pump VAZ 2107: purpose, malfunctions, repair and replacement
The pump is located in front of the engine and is included in the cooling system of the power unit: 1 - supply pipe to the cabin heater; 2 - expansion tank; 3 - radiator; 4 - pump; 5 - thermostat; 6 - collector heating tube; 7 - return pipe from the cabin heater

Which pump is better

Water pumps with catalog numbers 2107-21073, 1307010-2107-1307011 and 75-2123-1307011 are suitable for VAZ 75. The last two options have an enlarged impeller and a slightly reinforced design. Initially, these pumps were produced for the Niva. The slightly higher cost of such pumps is fully justified by better performance.

On the "sevens", equipped with both injection and carburetor engines, the same water pumps are installed, and their repair is carried out in a similar way.

Pump VAZ 2107: purpose, malfunctions, repair and replacement
The old pump has a cast iron impeller, and the new one is made of plastic.

The product in question today is produced by many companies, but the most popular are:

  • Luzar;
  • count;
  • TZA;
  • Fenox.

In the car market, you can find pumps with impellers made of different materials: plastic, cast iron, steel. Positive feedback is received by products with plastic impellers, which are equipped with embossed and oblong blades. Elements made of cast iron are characterized by lower productivity, and as for steel, they are susceptible to corrosion and quite often are fake.

Pump VAZ 2107: purpose, malfunctions, repair and replacement
The housing is replaced if it is damaged, and in other cases, only the pumping part is changed

The pump can be purchased as an assembly with a housing, or separately. If the housing is not damaged, then it is enough to replace the pumping part. If the design has serious flaws or even a breakdown, then replacing the case is indispensable.

Video: what pump to put on the "classic"

Pump VAZ 2101-2130. Differences. How to improve performance. Which water pump to put on a VAZ

Signs of pump malfunction

Sooner or later, problems arise with the pump and the node fails. This may be due to both the high mileage of the car, and the installation of a low-quality product. Therefore, it is worth considering what malfunctions can occur with the pump and what to do in this or that case.

Oil seal leak

Detecting a coolant leak through the stuffing box is quite simple: as a rule, a puddle appears under the car. If the sealing element is damaged, for example, as a result of wear, the antifreeze will get to the pump bearing, as a result of which the lubricant will be washed out of the device, and the part itself will soon collapse. To prevent this, it is necessary to periodically inspect the car and eliminate possible problems.

The appearance of noise

If during engine operation extraneous noise is heard from the pump area, this indicates an imminent breakdown of the assembly. The most likely cause of the noise is the failure of the bearings or the weak fastening of the impeller. In any case, the part needs to be dismantled, subsequently damaged, repaired or replaced.

Video: how the pump on the VAZ makes noise

Decreased productivity

Whatever antifreeze is used in the cooling system, it is a chemical. Over time, erosion occurs in the pump housing or on the impeller, which can lead to a decrease in the flow of the pumped liquid. As a result, overheating of the motor is possible with all the ensuing consequences. Therefore, if the coolant temperature sensor on the instrument panel began to exceed the value of + 90˚С (working temperature), it is worth thinking about the possible replacement of the pump, or at least revision of this unit.

Increased vibration

If increased vibration comes from the pump area, first of all, you need to inspect the pump housing in the bearing area: sometimes cracks may appear on it. It would also be useful to check the correct installation of the alternator belt, pump pulley and fan. If defective parts are found, replace them.

Dirty coolant

If the coolant has not been changed for a long time, then problems may arise with the pump. It is not difficult to determine the contamination of the system: the color of the liquid will be brownish instead of red, blue or green. When the antifreeze blackens, most likely, oil got into the cooling system.

How to check if the pump is working

The functioning of the pump can be checked with your own hands. This will require:

  1. Warm up the engine to operating temperature and pinch the upper pipe going to the radiator. If you feel a pressure surge when you release it, then the pump is working properly.
  2. There is a drain hole on the pump, so you should pay attention to it. If the gland does not cope with its functions, then the antifreeze may protrude from this hole.
  3. While the engine is running, you need to listen to extraneous sounds. If a rumble is heard from the side of the pump, then most likely the bearing has become unusable. You can check it on a muffled motor, for which you should shake the pump pulley. If play is felt, then the bearing must be replaced.

Work on checking the pump with the engine running should be carried out carefully, not forgetting the rotating fan and high coolant temperature.

Pump repair

If it was found that the pump needs to be repaired or replaced, you first need to prepare the necessary tool for work:

Withdrawal

Read about the device of the VAZ 2107 generator: https://bumper.guru/klassicheskie-modeli-vaz/generator/remont-generatora-vaz-2107.html

After preparing everything you need, you can start disassembling:

  1. We open the hood and drain the coolant, for which we unscrew the corresponding bolt on the cylinder block and the plug on the radiator.
  2. Remove the alternator belt by loosening the upper fastening nut and reducing the tension.
    Pump VAZ 2107: purpose, malfunctions, repair and replacement
    To loosen the alternator belt, unscrew the top nut
  3. Having unscrewed the nut more, we take the generator all the way to ourselves.
    Pump VAZ 2107: purpose, malfunctions, repair and replacement
    To move the generator to the side, it is necessary to loosen the upper nut more
  4. We unscrew the bolts securing the pump pulley and remove it.
  5. We loosen the clamps holding the pipes and tighten the hoses themselves.
    Pump VAZ 2107: purpose, malfunctions, repair and replacement
    To remove the nozzles, you will need to loosen the clamps and tighten the hoses
  6. We unscrew the fastening of the tube going to the stove.
    Pump VAZ 2107: purpose, malfunctions, repair and replacement
    We unscrew the fasteners of the pipe going to the heater
  7. We unscrew the fastening of the pump to the cylinder block and remove the assembly along with the gasket.
    Pump VAZ 2107: purpose, malfunctions, repair and replacement
    We unscrew the fastening of the pump to the cylinder block and remove the assembly along with the gasket
  8. To disconnect the pump from the housing, it is enough to unscrew 4 nuts.
    Pump VAZ 2107: purpose, malfunctions, repair and replacement
    Parts of the pump housing are interconnected with nuts

If the pump is being replaced without a housing, then there is no need to remove the nozzles and tube (points 5 and 6).

Disassembly

To carry out repair work, disassembly of the water pump will be required. Carry out the procedure in the following order:

  1. The impeller is dismantled, having previously clamped the pump in a vise.
  2. Knock out the shaft.
  3. Remove the seal.

Video: how to disassemble the pump on the "classic"

Bearing replacement

To replace the bearing, you will need to disassemble the pump and knock the shaft out of the housing. On the "classic" the bearing and shaft are one piece. Therefore, if one of the parts fails, the entire product is replaced. In order not to make a mistake when buying a pump shaft for a VAZ 2107, you need to take the old part with you, since the axles can differ both in diameter and in length, which the seller does not always know about.

The shaft is changed in the following order:

  1. Using a puller, the impeller is pressed out.
    Pump VAZ 2107: purpose, malfunctions, repair and replacement
    To remove the impeller you will need a special puller
  2. Loosen and remove the set screw.
  3. The shaft is knocked out by striking the butt end with a hammer. If it is not possible to extract the axle in this way, the part is clamped in a yew and knocked out through a wooden adapter.
    Pump VAZ 2107: purpose, malfunctions, repair and replacement
    After dismantling the impeller, the old shaft is knocked out with a hammer
  4. The pulley mounting hub is knocked down from the old shaft.
  5. Press the hub onto the new axle and drive it into the pump housing until it stops.
    Pump VAZ 2107: purpose, malfunctions, repair and replacement
    The hub is mounted on the shaft with light hammer blows
  6. Screw in the screw and install the impeller.

Learn more about wheel bearing repair: https://bumper.guru/klassicheskie-modeli-vaz/hodovaya-chast/zamena-stupichnogo-podshipnika-vaz-2107.html

Oil seal replacement

The stuffing box due to constant contact with antifreeze sometimes fails, which leads to a leak. To replace the part, it is necessary to dismantle the impeller and knock out the shaft with the bearing. To do this, you can use the old axle, which is inserted with the reverse end into the pump hole.

Then the shaft is driven in by striking with a hammer until the stuffing box comes out of the housing. A new sealing element is inserted and seated in place using a suitable adapter.

Replacing the impeller

If the impeller is damaged, for example, the blades are broken, then the part can be replaced. Damage occurs, as a rule, in contact with the housing due to severe wear of the shaft or bearing. Regardless of the material of the impeller, the part is attached to the axle by pressing. To replace the plastic impeller you will need:

  1. Having fixed the shaft on the reverse side in a yew, with an M18 tap with a pitch of 1,5 mm, they cut the thread inside the impeller, having previously lubricated the tool with engine oil.
  2. Screw a special puller into the hole, tighten the outer bolt.
  3. By turning the head of the inner bolt clockwise, the impeller is pressed out and removed from the shaft.
  4. The metal impeller is threaded from the factory, so the part is simply squeezed out with a puller.

When reinstalling, the part is pressed onto the shaft with a hammer and a suitable adapter, avoiding damage to the blades. It is necessary to ensure that the lower part of the impeller rests against the ring on the gland, after which it must be seated 2–3 mm inward. This will ensure a tight seal between the rotating part and the ring.

Video: how to remove the impeller from the pump shaft

In most cases, the owners of the VAZ 2107 and other cars do not repair the pump themselves, but simply replace the part.

Installation

Assembly and installation of the node is carried out in the reverse order. The only thing you should pay attention to is the gaskets - it is recommended to use new ones. In addition, the joints of the pump with the nozzles are coated with sealant. When the part is installed, antifreeze is poured. In order to prevent the formation of air pockets, a thin hose of the cooling system is disconnected from the carburetor (on a carburetor engine) and antifreeze flows out of the hose and fitting, after which a connection is made. Start and warm up the engine, inspect the nozzles for leaks. If everything is in order, the repair can be considered successfully completed.

Independent replacement or repair of a pump on a VAZ 2107 is quite within the power of every owner. The only thing is that in some cases special devices will be required. Otherwise, a standard set of tools will suffice. In order for the pump to work for a long time, it is recommended to choose a part from trusted manufacturers.

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