3.10. Check of a state and replacement of hoses of a motive compartment, localization of leaks
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Replacement of hoses of the air conditioning system has to be made at car repair shop of representative office or in a specialized workshop where there is an equipment for safe dumping of pressure in system. Never disconnect hoses of system and do not remove its components, previously without having dumped pressure. |
General information
Influence of high temperatures in a motive compartment leads to gradual failure of the rubber and plastic hoses used in various systems. It is regularly necessary to make check of hoses on existence of cracks, weakening of fastening of collars, hardening of materials and signs of leaks.
Information relating to cooling system hoses is given below, and to hoses of the brake system - in the Section of Check of the brake system. Adjustment of the parking brake.
The majority of hoses (but not all) fasten by means of collars. Where collars are used, check reliability of their fastening providing lack of leaks. If collars are not used, make sure that the hose in a junction with the union was not inflated and/or did not harden, allowing leaks.
If there are signs that there is a leak of any liquid, but you cannot distinguish type of liquid or an exact origin, then it is necessary to leave the car for long time and to put a big piece of paper or a rag under the car. It will help to find the place of course of liquid, and also will help to identify liquid on color. But keep in mind that some leaks can be shown only at the working engine.
Vacuum hoses
Usually vacuum hoses which are especially applied in systems of decrease in toxicity of the fulfilled gases differ in color or have color strips.
Various systems demand use of hoses with various thickness of walls, thermal stability and various resistance to a collapse. When replacing hoses you watch that material of a new hose corresponded to material of old.
Often only reliable way of check of a condition of a hose is its full removal from the car. At removal more than one hose take care of accurate designation of hoses and unions to provide the correct assembly.
When checking vacuum hoses do not forget to check T-shaped plastic connections also. Examine them on existence of cracks which can cause leaks.
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Using a similar stethoscope, be careful, do not allow contact with moving components in a motive compartment, such as driving belt, cooling fan, etc.) |
Leak in a vacuum hose means that air is sucked in in a hose (but does not leave a hose), and it does leak very difficult for detection. For identification of leak of vacuum it is possible to use a small piece of a vacuum hose as a stethoscope. When the end of a hose directly is over the place of leak, the hissing sound will be clearly heard through a hose. Listen to all vacuum hoses and connections on existence of the characteristic hissing demonstrating leak. It is necessary to avoid contact with hot and moving details as the engine when checking has to work.
Fuel hoses
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At survey or service a component of fuel system it is necessary to observe certain precautionary measures. You perform all works in well aired room, do not allow approach of naked flame (for example, the lit cigarettes) or the bulbs unprotected by the lamp shade to the venue of works. Immediately collect the spilled fuel by rags which put then to the place where its spontaneous ignition is impossible. At hit of fuel on skin immediately wash away it a plentiful amount of water with soap. At work with fuel system it is necessary to use goggles and always to have near at hand the fire extinguisher. |
Fuel hoses usually are under pressure therefore at their detachment be ready that fuel will be sprayed and he needs to be collected.
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Before serving fuel hoses, it is necessary to dump pressure in system of injection of fuel. |
PERFORMANCE ORDER |
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Metal lines
PERFORMANCE ORDER |
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Hoses of system of hydrostrengthening of a wheel
PERFORMANCE ORDER |
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Cooling system hoses
PERFORMANCE ORDER |
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