Priora engine number 16 valves where it is located

Engine number assignment

A car engine identifier is one of the identifiers of the series and brand of the power unit. They are installed at the manufacturer to identify whether the motor belongs to a particular series. By the marking of the power unit, you can determine which car the engine was installed on from the factory.

Also, the VIN of the power unit is required for registration with the state traffic inspectorate. Using this number, you can determine the owner of the car, as well as the correspondence of other identifiers. Often when a car burns out, the engine VIN is the only identifier by which the owner of the car can be determined.

Conclusion

Determining the engine number on a Lada Priora is quite easy. You just need to know the location of this identifier. Thus, the number is used to verify that the power unit belongs to the make of the car, and is also verified with other identifying elements. But, in a number of countries, this number is no longer an identifier and is not written down in registration documents.

Each car comes with a technical manual, where all the information regarding the car is presented in detail and in an accessible manner, and in several languages. An instruction manual is also included. As for the engine number, it is indicated in the instructions. It can also be found on the vehicle itself. This is not difficult to do, since there are not many numbers on the car to get confused.

Why do you need an engine number?

As already mentioned, it is necessary to know the engine number of a Priora vehicle in two cases:

when a car owner buys a car second-hand so as not to fall for a scammer. It is necessary to check the engine coding in the documents and the one printed on the engine. They must match. If they don’t match, then the car is stolen and the documents are fake;

registration with the traffic police. The procedure for registering a car occurs solely by engine number.

Attention! If the number on the engine is worn out or is missing altogether, then it is better to refuse to buy such a car. There may be problems in the future. There is no need to listen to the seller’s assurances that the code was erased for some reason.

The engine identification number of any car is also called VIN code. The English abbreviation stands for Vehicle Identification Number. You can find it in several places, which will be discussed below.

Life situations

Often, stolen cars cannot be verified by the VIN of the body, which is broken up in settling tanks. Many car enthusiasts, when buying a vehicle secondhand, do not even suspect that the car has been stolen. To determine the authenticity of the body marking, you need to find the engine identifier. Today, according to statistics, Lada Priora is one of the most stolen vehicles for committing crimes.

This made life quite difficult for criminals. But in a number of CIS countries, such as Ukraine, cars have not been identified by engine markings for several years now.

As practice shows, after committing crimes, the vehicle is burned to remove fingerprints and identification data. And only by the engine number, which does not burn out, can you determine which car it is, as well as the owner. Many times, murderers and other criminals have been identified thanks to the surviving engine ID.

This made life quite difficult for criminals. But in a number of CIS countries, such as Ukraine, cars have not been identified by engine markings for several years now.

What should the engine operating temperature be?

Engine operating temperature shown on the instrument panel

If we take the information from the international convention of automobile manufacturers dated December 1, 1992, then the unified standard for engine operating temperature is considered to be 90 degrees Celsius . With such indicators, the engine operates as efficiently as possible and does not create residual negative effects.

When switching to more advanced engine manufacturing technologies in 2004, it was accepted that a specific indicator of this indicator cannot be held in one position, and therefore they made a gradation of acceptable standards, which amounted to 85-105 degrees Celsius.

Engine overheating shown on the instrument panel

According to data from the manufacturer AvtoVAZ, on a 16-valve VAZ-2112 engine, the operating temperature of the engine is considered to be 87-103 degrees Celsius.

At this temperature, all systems function normally, and the motor is not subject to negative factors and consequences.

Cooling system design

The engine cooling system has many components that are interconnected, and if one fails, the entire system will not be able to function. So, let's look at the location diagram and decoding of the indicators for the cooling system of a 16-valve engine.

Diagram of the cooling system operation

1 – heater radiator; 2 – steam removal hose of the heater radiator; 3 – outlet hose; 4 – supply hose; 5 – coolant temperature sensor (in the block head); 6 – pump supply pipe hose; 7 – thermostat; 8 – filling hose; 9 – expansion tank plug; 10 – coolant level indicator sensor; 11 – expansion tank; 12 – exhaust pipe; 13 – liquid chamber of the carburetor starting device; 14 – radiator outlet hose; 15 – radiator supply hose; 16 – radiator steam outlet hose; 17 – left radiator tank; 18 – sensor for turning on the electric fan; 19 – fan electric motor; 20 – electric fan impeller; 21 – right radiator tank; 22 – drain plug; 23 – electric fan casing; 24 – timing belt; 25 – coolant pump impeller; 26 – supply pipe of the coolant pump; 27 – coolant supply hose to the throttle pipe; 28 – coolant drain hose from the throttle pipe; 29 – coolant temperature sensor in the outlet pipe; 30 – radiator tubes; 31 – radiator core.

Main malfunctions and ways to solve them

In fact, there are quite a lot of components in the cooling system that are susceptible to failure. This depends not only on the service life, but also on maintenance, as well as the quality of the parts. So, let's look at the main components, faults and methods for solving them.

Cooling radiator

Cooling radiator pulled from the engine

As practice shows, this part lasts quite a long time. The main cause of failure is clogged internal channels. So, if the blockage is sufficiently dense, the engine begins to heat up, the high pressure created by the pump can lead to a rupture of the tube and the radiator will leak.

Some car enthusiasts have it soldered and cleaned, but as practice shows, after a short period of time, a leak forms again. Therefore, if this part fails, it must be replaced with a new one.

Heater radiator

Heater radiator assembly with fan

The only detail in the system that does not affect the overall picture. The heater radiator ensures heating of the interior temperature and therefore its use is seasonal. Malfunctions and methods for solving them are the same as with the main radiator.

Pipes

KIT kit of cooling system pipes

One of the main components of the cooling system, since it is through the pipes that the fluid circulates through the system.

The main malfunction is considered to be wear, namely the appearance of cracks and leaks of coolant. To fix the problem, you need to replace the damaged element.

Of course, it is recommended to change everything in sets, since it is unknown how many kilometers later another one will have to be replaced, and the process itself requires draining the coolant.

Water pump

Water pump removed from the car

The pump circulates coolant throughout the system. So, if a leak occurs from the water pump bearing or noise increases, these are the first signs that the part needs to be replaced.

Thermostat

Thermostat disassembly process

The thermostat is the part of the cooling system that is most often replaced.

Thus, the first signs of a unit malfunction are considered to be an increase in the operating temperature of the engine to the maximum, as well as frequent turning on of the cooling fan. To fix the problem, you need to replace it with a new product.

Radiator cooling fan

Electric fan with casing removed

This part provides cooling of the liquid, but if there is insufficient oncoming wind flow, it is this part that additionally creates an air flow. The cooling fan prevents the temperature from rising to a critical level.

It turns on at 100 degrees Celsius, and turns off at 94 .

Cooling system sensor

Cooling sensor location

Part of the engine management system that sends a pulse to the ECU to turn the cooling fan on or off and also reports the status and changes in engine operating temperature. If it fails, the part must be replaced to eliminate the malfunction.

Removing the left support

We install an adjustable stop under the gearbox.

Using a 15mm socket with an extension, loosen the tightening of the upper tension nut of the support cushion.

From the bottom of the car, using a 17" socket with an extension, unscrew the nut securing the left power unit support to the gearbox bracket (for clarity, the left mudguard of the engine compartment has been removed)... ...and remove the washer.

Using a 13mm socket with an extension, unscrew the two bolts securing the support to the body.

Remove the left support. To disassemble the support, finally unscrew the upper coupling nut of the support cushion.

Left support parts

: 1 - upper nut; 2 - upper limiter; 3 - pillow; 4 - lower limiter; 5 — hairpin; 6 — washer; 7 — lower nut The upper support stop has two flats. When installing the support...

Source

Where is the engine identification number on the Priora?

The engine code is found using these three means:

lighting device;
car passport;
vehicle operating instructions.

The Vin code of a car from the VAZ manufacturer can be located in several standard places, regardless of the modification of the car or the number of valves:

on the cylinder on both sides or on one;
near the hole where the amount of engine lubrication is checked;
where the engine is connected to the automatic or manual transmission;
at the base of the corrector.

Sometimes the motor coding may be located in a different place. But this rarely happens.

Engine number on 16 valve

The engine number of 16 valves on a Priora can be viewed by first removing the air filter housing. Disconnect the corrugation. Using a mirror, the car owner will see two rows of numbers. Since the coding is located on the cylinder block below the thermostat housing.

To read the numbers and compare with the documentation, you will need to use a rag and WD 40 to clean the metal. The numbers tend to get dirty with dust.

Engine number on 8 mi valve

On an eight-valve Lada Priora engine, the engine coding is in the same place as on a 16-valve engine. The numbers are located on the end of the cylinder block, above the clutch housing. But there are also exceptions.

For example, on new models, the manufacturer may change the location of the motor code. In this case, he usually indicates the location of the VIN code in the technical passport for the car.

Lada Priora is the most stolen car among other domestic vehicles. Therefore, a car owner should always have an idea where the engine coding is located in order to refuse to buy a stolen car. Therefore, next we will talk about exceptions to the location of plates with vehicle data.

VAZ 2170 | Identification numbers

Identification numbers

VIN structure

Improvement of products is a continuous process of any continuous production. At the same time, with the exception of cases of major changes in the design of models coming off the assembly line, the results of the modification process are not covered in the vehicle’s operating manual. However, the manufacturer draws up numbered lists of manufactured spare parts, which is why the information encoded in the vehicle identification numbers is of particular importance when purchasing the latter. When placing an order for the necessary spare part, try to provide the seller with as much information as possible about your car. Be sure to provide the model name, year of manufacture, as well as body and power unit numbers.

The chassis number is stamped on the front panel of the car body.
The engine number is stamped on the cylinder block.
The transmission number plate is attached to the top of the transmission housing.

Don't confuse the transmission number with the engine number. VEHICLES WITH 5 DOOR HATCHBACK

There is no chassis number on the front cross member (above the radiator).

On some modifications of the car, the chassis and engine numbers are duplicated on a plate that is attached to the front panel of the body.

On other modifications of the car, a plate with the chassis number is located on the front cross member of the body (above the radiator).

Some vehicle options include a certification plate located on the rear end of the driver's door.

VEHICLES WITH 5 DOOR HATCHBACK

There is no certification plate on the end of the driver's door.

Vehicle Identification Number (VIN)

This extremely important number is stamped on the rear bulkhead of the engine compartment, as well as on a nameplate mounted on the instrument panel under the windshield on the driver's side of the car. The VIN is also entered into the vehicle title and registration certificate. The number contains information about the date/place of manufacture and body type of the car (see accompanying illustration).

Engine code and model year

The two main components of the VIN are the model year code and the assembly line/body/engine code.

Counting from left to right, the 4th, 5th and 6th positions of the number are assigned to the assembly/body/engine line code. Thus, Civic models are determined by the following combinations:

EJ6 = 3-door/D16Y7 EJ7 = 2-door/D16Y5 EJ8 = 4-door/D16Y8

Integra models are characterized by combinations:

DB7 = 4-door/B18B1 DB8 = 4-door/B18С1 DC2 = 3-door/В18С1, В18С5 DC4 = 3-door/В18В1

The tenth position of the VIN determines the year of manufacture of the model:

R = 1994 S = 1995 T = 1996 V = 1997 W = 1998

Engine number

The engine number, which is impossible to do without when ordering spare parts for the power unit, is located on the right (on the passenger side of the car) on the block, next to the exhaust manifold. The first five positions of the number determine the engine code. This manual covers models equipped with the following four engine types:

Civic

D16Y5 = 1.6 l, SOHC, 16-valve, VTEC-E D16Y7 = 1.6 l, SOHC, 16-valve D16Y7 = 1.6 l, SOHC, 16-valve, VTEC

Integra

В18В1 = 1.8 l, DOHC, 16-valve В18С1 = 1.8 l, SOHC, 16-valve, VTEC В18С5 = 1.8 l, DOHC, 16-valve, VTEC

Transmission number

This number is required when ordering spare parts for transmission line repair. On models equipped with a manual transmission, the transmission number is stamped on the clutch dome, next to the starter. On models with AT, the number is located on the right front of the transmission housing, near the dipstick. On models equipped with CVT, the number is located on a vertical platform, also near the dipstick.

automn.ru

Exceptions

For example, in some older Lada Priora models with a 16-valve engine, car owners will not find stamped numbers in the usual place. This is prevented by the characteristic features of the car. Therefore, the manufacturer recommends looking in the following places when trying to compare the stamped motor code with the documentation:

right wing front;
at the bottom of the body;
in the cabin, to the left of the driver's seat.

If it is not found in these places, then you need to look for it in the old ones. It is better to immediately find out the VIN code of the engine from the selling car owner, so as not to have problems with the traffic police later. It is necessary for the seller to show where the number is located and help in checking it with the code that is written in the documents.

Where is the engine number on Lada Priora 8 and 16 valves diagram

Is it possible to tint numbers on a car?

Where is the Lada Priora engine number?

This information interests people for a reason. The fact is that this data is often needed when stopped by traffic police officers. They often require this information and also ask to show where the number is located in order to verify the identity of the data in reality and in the technical passport. When buying a car on the secondary market, this information is also needed. It happens that a car is listed as stolen, and if you purchase it, you may have serious problems. To avoid this, you need to know the engine number of your iron horse.

Items that can be used to find the number:

instructions for use;
technical certificate;
lighting device.

Using these tools, you can find out what engine number your car has.

Location

If the car has a number, then it is definitely registered. In order to figure out where the number is located, you need to open the hood. The rooms can be located in the following places:

On both sides of the cylinder block.
Below the hole for the engine oil level dipstick.
The place where the gearbox and engine connect.
On the air intake compartment.
At the base of the corrector.

The engine number of the Lada Priora may be located in these places. You need to look carefully so as not to miss it, although recognizing it will not be difficult for an experienced driver.

What to do if the engine is dirty and the license plates are not visible

Those who do not take care of their car may encounter a problem when the markings on the engine are not visible. It is not necessary to immediately send the car to a car wash; it is enough to wash the device with your own hands. For small dirt deposits, you can wash it with a damp cloth soaked in detergent. If the unit is very dirty, you will need sandpaper. Although it’s better not to let it come to that. After washing, the number can be easily seen. If the dirt is not washed off, you cannot do without the help of a car wash.

Where is the number on Priora

For all VAZ cars, the number can be located on the mudguard of the front right fender. The duplicate is located in the lower part of the body. It is also possible to place it in the cabin near the driver's seat. It depends on the model. The placement on newer brands is different from older models. The number contains the following indicators:

trunk numbering;
motor;
the greatest weight when the car is moving;
trailer weight resolution;
maximum load on the rear and front axles;
type of marking;
code;
code for additional spare parts.

To summarize, we note that every driver should know where his engine number is located. This is necessary to avoid problematic situations with traffic police officers, and also to be sure that your car is not stolen. There can be many unforeseen situations in life when knowing the engine number can help get out of a problematic situation. You don't need to have a lot of knowledge to figure out the number. Just scroll through the instructions for use.

Where is the VIN code and engine number of the Lada XRAY Topic author Dmitry

Where is the engine number on the Lada Granta: description and photo
Where is the VIN code and engine number on the Lada XRAY? By law, each vehicle has an identification number (VIN code). This number is recorded in the vehicle passport (PTS). The identification number and other passport data are indicated on the summary plate, and the VIN code is also stamped on the body. Do you know where the VIN and engine number are located on XRAY? VIN code 1. The identification number (VIN code) is stamped on the floor under the front passenger seat on the right side. To inspect the room, a valve has been cut out of the carpet. The VIN code is also duplicated on the wall between the engine compartment and the engine. Depending on the configuration of the Lada XRAY, there may be a glove box under the passenger seat. In this case, to access the number, you must fully extend the movable part of the glove box by pulling the stops outward on both sides. 2. The marking (nameplate) is located on the right pillar, below, near the threshold. It indicates the model, car number, engine model, weight data, number for spare parts, design options, and configurations. Explanation: Name of the manufacturer OJSC AVTOVAZ (AVTOVAZ). Vehicle type approval number. It is given in full in the vehicle passport. Vehicle identification number VIN. Technically permissible maximum vehicle weight. Technically permissible maximum weight of a road train. Technically permissible maximum axle weight on the front axle. Technically permissible maximum axle weight on the rear axle. Vehicle designation. Engine designation. Number for spare parts. The number for spare parts corresponds to the serial number of the vehicle leaving the assembly line. When ordering spare parts, you must refer to the information contained on the identification plate. Market circulation sign. Let us recall that in accordance with the Decision of the Customs Union Commission dated June 15, 2021 No. 711, the model year is defined as a conditional year indicated by the manufacturer (usually following the actual year of manufacture of the vehicle). At JSC AVTOVAZ, the start of the model year is set on July 1 of the calendar year. Thus, from January 1 to June 30, the model year corresponds to the actual year of manufacture of the car, and from July 1 to December 31 corresponds to the one following the actual year of manufacture of the car. Model and engine number The VAZ engine model and number are stamped on the end of the cylinder block on the left next to the gearbox. On the Renault-Nissan HR16DE/H4M, the engine number is stamped on the cylinder block in the location shown in the figure: Let us remind you that instructions for operating and self-repairing the Lada XRAY can be found in this category or in the content. https://lada.online/car-description /reviews-tests/lada-xray-reviews-tests/1545-gde-nahoditsya-vin-kod-i-nomer-dvigatelya-u-lada-xray.html

Decoding the number on Lada Priora

The code may contain more than just the motor code. The code on the identification plate was created to indicate additional vehicle parameters:

the name of the plant that manufactured the Lada Priora;
vehicle identifier;
car model version;
maximum load on the rear and front axles;
motor configuration version;
vehicle weight;
serial number of the configuration;
serial number for ordering spare parts for the engine installed on this Lada model.

For example, consider the following encoding on a metal plate: VTA 21703080006859, where the letters and numbers mean the following:

VTA – manufacturer’s index;
217030 – modification of the vehicle;
8 – code of the year of manufacture of the car model. In this case, 8 corresponds to the production of Lada Priora cars from October 2007 to September 2008;
the last digits starting with three zeros indicate the body number of the Lada Priora.

Therefore, it is important to understand the differences between the coding on the identification plate and the engine number that is stamped on the motor. And also do not forget to clean the stamped numbers on the engine before selling the vehicle. This will make it easier for the buyer to understand the coding, and the purchase will go without a hitch. Since the buyer will no longer doubt the integrity of the seller.

VESKO-TRANS.RU

AutoNews / Reviews / Tests

Where is the Engine Number of VAZ 2112 16 Valves

Years of production - (1997 - 2004) Cylinder block material - cast iron Power system - injector Type - in-line Number of cylinders - 4 Valves per cylinder - 4 Piston stroke - 71mm Cylinder diameter - 82mm Compression ratio - 10.5 Engine displacement 2112 - 1499 cm cube Engine power 2112 – 93 hp. /5600 rpm Torque - 128 Nm / 3700 rpm Fuel - AI95 Fuel consumption - city 8.8 l. | track 5.5 l. | mixed 7.3.2 l/100 km Oil consumption - 50 g/1000 km Weight of the VAZ 2112 engine - 127 kg Overall dimensions of the 2112 engine (LxWxH), mm - Oil for the VAZ 2112 engine: 5W-30 5W-40 10W-40 15W40 How much oil in engine 2112: 3.5 l. When replacing, pour 3.5 liters.

Resource: 1. According to plant figures – 150 thousand km 3.2. Realistically – 250 thousand km

TUNING Potential – 400 hp. Without loss of resource - up to 120 hp.

The engine was installed on: VAZ 21103 VAZ 2111 VAZ 2112

Malfunctions and repairs of the 2112 engine

The VAZ 2112 (21103) engine is a high-quality evolution of the VAZ 2111 engine, but with 16 valves instead of 8 and gave rise to a series of VAZ engines that are produced to this day, already in the form of a motor prior. The main differences of the motor 2112

from 2111 in the process of using 4 valves per cylinder, 3.5 camshafts, this allows the engine to supply more than just a fuel-air mixture into the combustion chamber at once and more quickly remove exhaust gases into the exhaust channel. Up to 3 thousand rpm, the motors operate approximately identically; after 3 thousand, 16V becomes much more dynamic. In this case, the fuel consumption is lower than on the 8 valve 2111. The VAZ 2112 engine is 1.5 liters. injection in-line 4-cylinder with an overhead camshaft, the gas distribution mechanism is belt driven. Cylinder block 2112, the same as on 21083, alas, with modified mounts under the cylinder head and additional oil channels for the main bearings, a number

VAZ 2112 engine. The normal operating temperature of the 2112 engine is 90 degrees. The service life of the 2112 motor, according to the manufacturer, is 150 thousand km, in reality the motors last more than 250 thousand km.

The other side is the VAZ engine 2112

, when the timing belt breaks, the valve bends. The problem is solved by installing pistons from the 124 engine, but in this case we will inevitably lose several horsepower. If you do not want to lose power, you must constantly monitor the condition of the belt. For this purpose, we listen to the sounds coming from the drive; the rollers usually begin to squeak when cool, then rustle, after which they collapse. The pump begins to leak (the belt will be in antifreeze). The shaft seals are leaking (the belt is covered in oil). The shafts wear out - the belt begins to slide to the side and rub against the roller flange (grinding when cool). The belt may also slip due to crooked rollers.

Possibility of installing an additional water pump on the Lada-Priora

One of the disadvantages of the heater on the Lada Priora car is its low efficiency when the engine operates at low speeds in the cold season, due to insufficient coolant circulation. Therefore, the car interior warms up slowly and insufficiently, which causes some discomfort for the driver and passengers.

There are some requirements that must be met to obtain a high-quality result after installing an additional electric pump.

These include the following points:

the installed product should not create excess pressure in the heater radiator during operation in order to avoid damage to the pipes or the formation of cracks;
It makes sense to replace the thermostat and install this component with an increased opening temperature (90–95 degrees Celsius) due to the fact that as the speed in the coolant circulation increases, the engine parts will warm up more slowly, increasing wear on the power unit.

To solve this problem, you can install an additional water pump in the cooling system of the power unit, which will qualitatively improve the heating of the car interior even when the engine is idling. This technology is not new. Engineers have been using it for a long time. Examples include German cars BMW or Mercedes Benz.

Device selection

As a rule, devices from various manufacturers are suitable as an additional water pump for the Lada-Priora car.

These, for example, could be brands from:

Bosch company;
;
.

Video: positive effect of installing an additional electric pump on the Lada Priora

However, most often the Lada Priora is equipped with an electric water pump, which is installed on Gazelle cars. This may be an old or new design, but the principle of operation is the same for both: due to the vacuum at the inlet during operation of the product, a pumping force arises, which drives the coolant through the system. In fact, the pump from the Gazelle car is a classic centrifugal pump.

The design of the new pump version is much more successful and causes fewer complaints from car enthusiasts. And it is also less noisy during operation. The main problem that motorists encounter when using such an electric pump is its leakage.

Installation and connection of an additional electric pump

To equip a car with an additional electric water pump, you will also need a regular relay that has normally open contacts (this can be an ignition or starter relay from a VAZ 2105, VAZ 2108). It is necessary to close contacts No. o86 and No. o30. And you will also need a reinforced hose and clamps for clamping the pipes.

An additional pump can be installed in any of the gaps in the supply or outlet pipes of the car’s heating stove.

Installation of an additional electric pump is quite simple, and the efficiency of the heater increases significantly

The pump is fixed in the Lada Priora in the following places:

stud for fastening the washer reservoir;
studs located next to the battery;
on the engine shield.

The device can be connected to a wide variety of systems.

It could be:

recirculation button;
SAUO stove block;
heated mirrors;
other convenient places.

How to find out the color of a VAZ car

The label with the body color number of domestic cars can be found on the trunk lid, in the glove compartment, in the spare tire niche near the spare wheel or under it, under the brake light on the spoiler. This simple piece of paper is called Form 3347. It can be difficult to find, easy to lose, and easy to forget. Therefore, if it is found, champions recommend writing down the number and name of the paint with a marker on the inside of the gas tank flap. If you have a used car, check to see if someone has already done this.

Please also note that the color code is also written on the warranty card .

What else can you do to find out “what is my Lada painted?” An alternative is to contact the dealer from whom you bought the car, which only works naturally if the dealer is a completely official organization.

What to do if the engine is dirty and the license plate is not visible

If the engine is dirty and the license plates are not visible, then there is no need to immediately go to the car wash. You can use available cleaning products. A wire brush, a rag and a cleaning agent such as WD 40 will do.

Some car owners manage to clean a rusty plate with acetic acid. If the contamination is large, the rust has eaten into the metal, then acid will not be able to help. You will need sandpaper. “Zero” or “one” will do. There is no need to take one that is too large; parts of the numbers may be damaged.

Do the valves on the Priora 1.6 bend 16 valves? Analysis of the moment from all angles

The rather not idle question of whether the valves on the Priora 1.6 bend 16 valves is always of interest to both potential buyers of this model and its owners. Some people want to know: on which modifications do the valves bend and on which ones not? Others ask friends and acquaintances: how can this be prevented and how can flaws be dealt with?

Of course, in such cases, it is best to turn to the opinion of people who have already found themselves in a similar situation and tried to solve these problems, or to the Internet.