General information
1. Air conditioning hoses are checked and changed only in a car service.
2. Under the influence of high temperatures inside the engine compartment, the rubber and plastic hoses gradually harden and destroy, ensuring the operation of various engine components. You should periodically check the condition of the hoses, the presence of cracks and hardening, loose connections, leaks.
3. Part of the hoses are attached with clamps. Check the tightness of the clamps, as loosening the fastening leads to a leak. In those places where clamps are not provided, check the reliability of the hose seal on the fittings, loss of elasticity in such connections due to swelling or hardening of the hoses is not allowed, otherwise the tightness of the connection is violated.
Vacuum hoses
4. Vacuum hoses can be distinguished by their color, or by the colored strips glued to them. Vacuum hoses with different wall thicknesses, atmospheric compression resistance and heat resistance are used for different engine systems. When replacing, make sure that the new vacuum hoses exactly match the ones being replaced.
5. Often the hose can only be checked after it has been removed from the vehicle. If several hoses are removed, first mark the mating fittings and hoses so as not to disturb their relative position later.
6. At check of a condition of vacuum hoses at the same time examine also plastic tees. Check for cracks on them, as well as deformation of the hose at the point of contact with the tee, which may be the cause of a leak. Reinforced vacuum hoses must not be replaced with clear plastic or water hoses.
7. To check for leaks, listen through a piece of hose with an internal diameter of about 6 mm, attaching the hose to the place to be checked. characteristic «hiss» indicates a leak.
Fuel hoses
8. Check the condition of the rubber fuel hoses for damage.
9. When replacing the fuel line on injection engines, the new line must exactly match the one used in the fuel system of engines of this type.
10. When replacing hoses, always install screw clamps.
Metal tubes
11. Metal pipes are commonly used in the fuel system. Check for twisted sections and small incipient cracks on the tubes.
12. Replace only with seamless steel tubing. Tubes made of copper or aluminum are not suitable, as they cannot withstand vibration loads.
13. Check up a condition of metal tubes and unions of system of a hydrodrive of brakes in junctions with the main brake cylinder and batcher. The basis for a thorough check is any evidence of fluid loss from the hydraulic drive.