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Check and replacement of hoses of an impellent compartment, localization of leaks

Replacement hoses air conditioning system should be carried out by a workshop representative office or an authorized service workshop, where there is equipment for the safe depressurization of the system. Never disconnect the hoses and remove its components without first dropping the pressure.

general information

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Exposure to high temperatures in the engine compartment results in a gradual failure of rubber and plastic hoses used in various systems. Should regularly check the hoses for cracks, loose clamps, curing materials and signs of leaks. For information on cooling system hoses, see. Section Check of functioning of system of cooling and frost coolant fluid replacement, and for brake hoses - in Section Check of brake system. Most hoses (but not all) are secured with clamps. Where clips are used, check the reliability of their fastening providing leaks. If clamps are not used, make sure that the hose at the connection with the union is not swollen and / or hardened, preventing leakage. If there are signs that there is a leak of any liquid, but you can not identify the type of fluid or the exact origin, it is necessary to leave the car for a long time and put a large piece of paper or a rag under the car. This will help to find a place liquid flow, and help to identify the color of the liquid. But keep in mind that some leaks can be shown only when the engine is running.

Vacuum hoses

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Usually vacuum hoses, especially used in systems reduce emissions, are color-coded inserts or colored stripes. Various systems require the use of tubes with different wall thickness, heat resistance and resistance to various popping. When replacing the hose, make sure that the new material to match the material of the old hose. Often, the only reliable way to check the status of the hose is a complete removal of it from the car. When removing more than one hose take care of a clear labeling hoses and fittings to ensure proper assembly. When checking the vacuum hoses do not forget to also check out the T-shaped plastic compounds. Inspect for cracks, which may cause leakage. Using a similar stethoscope, beware - avoid contact with moving components in the engine compartment, such as a belt, a cooling fan, and so on! Leak in a vacuum hose means that air is sucked into the hose (instead of leaves a hose), and it does leak very difficult for detection. For vacuum leak detection, you can use a small piece of a vacuum hose as a stethoscope. When the hose end will be directly over the leak place, the hissing sound will be clearly audible through a hose. Listen to all vacuum hoses and connections for the characteristic hiss, which indicates a leak. It is necessary to avoid contact to hot and moving details as the engine at check should work.

Fuel hoses

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When inspecting or servicing fuel system components must comply with certain precautions. All work is performed in a well ventilated place, do not approach an open flame (eg lighted cigarettes) or unprotected light bulbs shade to the place of work. Spilled fuel immediately collect rags, which develops later in a place where it can not be spontaneous combustion. If you get fuel on your skin, immediately rinse it off with plenty of water and soap. When working on the fuel system must use protective goggles and always have a fire extinguisher. Fuel hoses usually are under pressure, so their removal would be prepared for the fact that the fuel is sprayed and it is necessary to collect. Before serve fuel hoses, it is necessary to relieve the pressure in the fuel injection system! Check all rubber fuel hoses for signs of wear and tear. Pay special attention to areas of bending and before the fittings, such as the connection of the hose to the fuel pump or filter, there can be formed cracks. Use only high-quality fuel hoses. Never, under any circumstances, do not use as fuel unreinforced vacuum hoses, transparent plastic tubes and water hoses. To fix the fuel hose clamps are commonly used tape type. These clamps over time weaken the tension and can "jump" when removed. When replacing hoses replace such collars with collars of screw type. Fuel leaks precisely to define difficultly while leak does not become essential and, hence, easily visible. Fuel tends to quickly evaporate as soon as it comes into contact with air, especially in the hot engine compartment. Small drops can disappear before you can define a leak place. If you suspect that there is a fuel leak in the engine compartment then cool the engine and run it until it is cold, at an open cowl. Metal objects are compressed at cooling, and rubber hoses tend to be weakened, so that any leaks will be more obvious, while the engine heats up when starting from cold.

Metal line path of brake system and power supply system

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Between the fuel pump and the fuel injection system are often inserted section metal tubes. Carefully inspect the tubes for dents, twists or cracks. If a section of the metal lines must be replaced, use only seamless steel tubes, as copper and aluminum tubes strong enough to withstand the vibrations caused by the operation of the engine. Check metal brake line at the connection to the master cylinder and a pressure regulator, or ABS (if equipped) for any cracks or loose compression fittings. Any signs of brake fluid leaks require immediate thorough examination of the entire brake system.

Hydrostrengthening steering hoses