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Check and replacement of hoses and tubes in the engine compartment, localization of leaks
 | The replacement hoses air conditioning (A / C) should be carried out in the workshop or in the studio with equipment for the safe depressurization of the system. Never disconnect hoses of system K / V and do not remove its components without first dropping the pressure. |
general information 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, loosening clamps, curing materials and signs of leaks. Information relating to the coolant hose, refer to Section Check of levels of liquids, the control of leaks and hoses to the brake system - in Section Checking the suspension components and steering. Most hoses (but not all) are secured with clamps. Where clips are used, check the reliability of a tightening of providing leaks. If clamps are not used, make sure that the hose at the connection with the union is not swollen and / or hardened. If there are signs of leakage of any liquid, but the type or origin of the fluid does not recognize, leave the car for a long time and put under it a large piece of paper or cloth. This will help to find the location of the liquid flow, as well as to identify it by color. But keep in mind that some leaks can be shown only when the engine is running. Vacuum hoses Usually vacuum hoses especially applied in the reduction of emissions (EGR), 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 simultaneously several hoses tag them ends 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. A leak in the vacuum hose means that air is sucked into the hose (not leave a hose), and it makes difficult to detect a leak. For leak detection vacuum can use a small segment of the vacuum hose as a stethoscope. When the hose end will be directly over the leak place, the hissing sound will be clearly audible through it. Listen to all vacuum hoses and connections for the characteristic hiss, which indicates a leak. | Using a similar stethoscope, be careful not to allow contact with moving components in the engine compartment, such as a belt, cooling fan, etc. |
Fuel hoses | 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 lamp shade to the place of work. Spilled fuel immediately collect rags, which develops later in a place where it is impossible to ignite. 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 ready to collect sprayed fuel. Check all rubber fuel hoses for signs of wear and tear. Pay careful attention to the area of the bend before and fittings, such as the connection of the hose with the fuel pump and filter, there may be generated cracks. Use only high-quality fuel hoses. Never use as a fuel, not reinforced vacuum hoses, clear plastic tube or water hoses. To fix the fuel hose clamps are commonly used tape type. These collars weaken over time and can "jump" when removed. When replacing the hose, replace the hose clamps are screw-type clamps. Insignificant fuel leakage is difficult to pinpoint since 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 will be able to locate the leak. Metal fittings are compressed at cooling, and rubber hoses are thus weakened, so that any leaks will be more obvious, while the engine heats up when starting from cold. Metal lines Between the fuel pump and the fuel injection system installed sections of metal tubes, which must be carefully checked 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 with the GTZ, the pressure regulator / activator ABS on the presence of cracks or loose compression fittings. Any signs of brake fluid leaks require immediate thorough examination of the entire brake system.
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