Diagnosing a malfunction begins with determining exactly what kind of malfunction unit It makes noise or needs to be replaced. The driver cannot explain the problem to the mechanic unless he knows what is knocking. suspension or radiator. Understanding the anatomy of a car is the first step to competent operation and timely maintenance of any vehicle.
Knowledge of the main parts of the machine allows you to avoid unnecessary costs on the service and find information faster in manuals. A modern car consists of thousands of parts, but they are all grouped into several large functional systems. Once you understand the basic structure, you will no longer be helpless in the face of technical complexity.
In this article, we will consider in detail the key nodes, their location and purpose. Remember: the wrong part name can lead to the purchase of incompatible parts. We will go from the power frame to the controls to form a clear mental map of the car.
Body and power frame of the car
The basis of any vehicle is the body, which serves as a supporting structure for all other units. It is the body that perceives all dynamic loads arising during movement and ensures the safety of passengers. In modern machines, a load-bearing body is used, where the frame as a separate element is often absent, and its functions are performed by reinforced spars and sills.
The external elements of the body include panels that form the appearance of the car and aerodynamics. They're included wings, hood, boot-lid and doors. These parts are usually made of thin steel or aluminum and are subject to replacement or repair in an accident. The inner part of the frame, including the racks and floor, requires more serious intervention in restoring geometry.
- 🚗 Longerons - the main power elements passing along the bottom, they take the blow in a frontal collision.
- 🚗 Stands. (front, middle, rear) - vertical roof supports, providing rigidity of the body and protection during rollover.
- 🚗 Thresholds - the lower connecting elements between the front and rear of the body, often suffer from corrosion and stone impacts.
⚠️ Note: When buying a used car, be sure to check the integrity of spars and racks. Their repair or replacement indicates a serious accident in the history of the car, which can be life-threatening.
Particular attention should be paid to the elements, such as bumpers. Although they are often perceived as a decorative element, their main task is to absorb the impact energy at low speeds and protect pedestrians. Inside the front bumper, parking sensors, fog lights and cooling system elements are often hidden.
Engine and power system
The heart of the car is combustion-engine (ICE) or electric motor that converts fuel energy into mechanical motion. For most drivers, the engine compartment remains terra incognita, hidden behind plastic decorative casings. However, understanding the location of the main engine components is critical to controlling the levels of technical fluids.
The power supply system is responsible for preparing and supplying the fuel-air mixture to the cylinders. In modern injection engines, an electronic control unit (ECU), nozzles and a fuel pump are responsible for this process. Disruption of any of these elements leads to loss of power, increased fuel consumption or complete stop of the engine.
| Component | Function | Frequency of verification |
|---|---|---|
| Air filter | Cleaning the air from dust before entering the engine | Each TO (15 thousand). km |
| Fuel filter | Delay of impurities and water in fuel | 30-60 thousand. km |
| Throttle | Adjustment of incoming air | When floating turns appear |
| Fuel tank | Fuel storage | Visually at the gas station |
An important element of the system is drain-manifoldDistributing the mixture to the cylinders. Its tightness directly affects the stability of the engine at idle speeds. Suction of unaccounted air through cracks in the collector or pipes is a common cause of poor mixture and engine errors.
What is a turbocharger?
A turbocharger is a system that uses the energy of the exhaust gases to rotate the turbine, which in turn pumps more air into the engine. This allows you to burn more fuel and significantly increases the power of the engine without increasing its volume.
Transmission: torque transmission
The transmission serves to transfer torque from the engine to the driving wheels and change the traction force. Without this node, the car would not be able to move from a place or develop high speed. The main elements of the classic transmission are the clutch (or hydraulic transformer), the gearbox, the driveshaft and the main gear.
Transmission (PPC) can be mechanical, automatic, robotic or variable. Each of them has its own features of service, but they all perform one function - changing the gear ratio. Failure of the elements of the checkpoint is often accompanied by howling, hum or jerks when switching.
- 🔧 Clutch. - a mechanism that allows you to temporarily disconnect the engine and gearbox for speed switching.
- 🔧 Drive shafts (half axles) - transmit rotation from the differential to the wheels, equipped with hinges of equal angular speeds (SRUS).
- 🔧 Differential - allows the wheels of one axle to rotate at different speeds, which is necessary when cornering.
Particular attention is required hinges of equal angular velocities, known in the people as pomegranate. When their anthers are damaged, the grease is washed out and the metal hinge quickly fails. The characteristic crunch with the wheels turned out is a sure sign of the need to replace the ShRUS.
⚠️ Note: Operation of a car with a torn anther of the SRUS or damaged osteometer of the checkpoint is prohibited. Getting dirt and losing lubrication will lead to a jamming of the knot on the move, which can cause an accident.
☑️ Diagnostics of transmission
Chassis and suspension
The suspension of the car is a set of parts, components and mechanisms that provide an elastic connection between the body and the wheels. It is from the suspension condition that the comfort of movement and stability of the car on the road depend. The main elements here are shock absorbers, springs and levers.
Shock absorbers They extinguish the vibrations of the springs, not allowing the body to swing indefinitely after the passage of irregularities. The springs are able to perceive the weight of the car. Over time, these elements get tired and the car loses contact with the road, which increases the braking distance. The suspension levers connect the wheels to the body and ensure the correct position of the wheels.
The most important element of security is brakewhich also applies to the sleeve. It includes brake discs (or drums), pads, calipers and brake fluid. The effectiveness of braking depends on the state of friction linings and the lack of air in the highways.
- 🛑 Brake calipers - press the pads to the disc; require regular lubrication of the guides.
- 🛑 Silentblocks - rubber metal hinges that extinguish vibrations in the suspension levers.
- 🛑 Transverse stability stabilizer - reduces the roll of the body in turns, connects to the levers through the racks.
Checking shock absorbers: Press hard on the corner of the car and let go. If the body swinged more than once and immediately stopped - the shock absorber is serviceable. If the swelling continues, the element needs to be replaced.
Steering control
Steering allows the driver to set the direction of the car. The main element of the modern system is steering-rail, which converts the rotation of the steering wheel into the translational movement of the wheels. Most cars use a hydraulic (GUR) or electric (EUR) amplifier to facilitate driving.
The connection between the steering wheel and the rack is carried out through steering-shaftOften having a cardan connection to compensate for vibrations. At the ends of the steering rods are the tips that directly turn the rotary fists of the wheels. Luft in these compounds leads to the appearance of knocks and fuzzy control.
Violation of the steering mechanism can be manifested in heavy rotation of the steering wheel, the appearance of backlash or the hum of the GUR pump. It is important to monitor the integrity of the anthers of the steering rack, since the ingress of moisture and dirt inside the mechanism leads to corrosion of the mirror surface of the rod and leaks of the glands.
Safety First: Any extraneous noises in the steering or change in steering force require immediate diagnosis. Failure to steer at speed is deadly.
Emission system
The exhaust system removes the combustion products from the engine, reduces noise and cleanses gases from harmful substances. It starts with drain-manifoldIt collects gases from cylinders. The gases then pass through a catalytic converter, which burns the fuel residue and reduces toxicity.
An important element of modern ecology is particulate (for diesel engines) and exhaust gas recirculation system (EGR). These units are sensitive to fuel quality and operating modes. Clogging of the particulate filter or EGR valve leads to loss of power and the engine goes into emergency mode.
The system is completed by a silencer that extinguishes sound waves. Owners often face the problem of a silencer burning out due to condensation, especially on short trips. The exhaust system is attached to the body on rubber suspensions, which extinguish vibrations and do not transmit them to the cabin.
FAQ: Frequently Asked Questions
How often do you need to change the parts of the suspension?
The resource of the suspension parts depends heavily on the quality of the roads and driving style. On average, shock absorbers go 60-80 thousand. km, Silent blocks and stabilizer racks - 30-50 thousand. km, and ball supports - 50-70 thousand. km. However, if knocks or deterioration of controllability, an inspection is required immediately, regardless of the mileage.
What are the “expenditures” in a car?
Consumables are parts and liquids that require regular replacement during operation. These include engine oil, filters (oil, air, salon, fuel), brake fluid, antifreeze, brake pads and discs, spark plugs and wiper brushes.
Can I drive with a faulty catalyst?
Technically, the car can also drive with a remote or faulty catalyst, but this will lead to increased fuel consumption, an unpleasant smell, a decrease in engine power and environmental regulations. In addition, the ECU of the engine can incorrectly adjust the mixture, which in the long run will harm the engine.
Where is the VIN code of the car?
The VIN (vehicle identification number) is usually stamped on a metal plate in the under-hood space, on the body rack at the driver's door (in the opening) and on the frame itself or bodywork under the mat in the legs of the passenger or driver. It is also listed in the car documents.