Caution: Replacement of air conditioning system hoses must be performed at a specialized service station. where equipment is available for safely emptying and filling the system with refrigerant
General information
1. High temperatures in the engine compartment cause rapid aging of the rubber and plastic from which the engine system hoses are made. Therefore, hoses should be periodically inspected for cracks, hardening, secure tightening of clamps, and leaks.
2. Information regarding the features of the cooling system hoses is given in paragraph 14.
3. Some, but not all, hoses are secured with clamps. Check that the clamps have not become loose, which could lead to leaks at the connections. If the hose is attached to the fitting without a clamp, check to see if the hose has swelled or hardened at the connection point, which could also be the cause of the leak.
Vacuum hoses
4. Vacuum hoses, especially those designed for use in the exhaust system, are usually color-coded. Different systems require hoses with different wall thicknesses, dimensional stability and heat resistance. When replacing hoses, make sure that the new hoses are made of the same material.
5. Often, to check the hose, it needs to be removed from the car. If multiple hoses are removed at the same time, label each one. to avoid mixing them up during installation.
6. When checking the hoses, also check the plastic T-pieces of the vacuum lines. Check to see if there are any cracks in the manifolds, if the hoses are tightly fitting their ends, or if there are any leaks at the connections.
7 To detect vacuum leaks, you can use a small piece of vacuum hose with an internal diameter of 6-8 mm as a stethoscope. Hold one end of the hose to your ear and use the other end to "listen" to the vacuum connections. A vacuum leak will make itself known with a characteristic "sucking" sound.
Caution: When performing this diagnostic procedure, be careful not to get caught in any rotating engine parts.
Fuel hoses
Caution! Gasoline is highly flammable, so exercise extreme caution when working around the fuel system. Do not smoke, use open flames or unprotected portable lamps in the work area. There should be no gas appliances with a pilot light, such as water heaters or dryers, in the garage. Gasoline is a carcinogenic substance, so wear protective gloves, and if gasoline comes into contact with your skin, wash it off with soap and water. Wash off any spilled fuel immediately. do not store fuel-soaked rags in the garage. The fuel system is always under pressure, so before disconnecting any fuel line, first relieve the pressure in the system (see chapter 4). Keep a carbon dioxide fire extinguisher handy and familiarize yourself with the instructions for using it beforehand.
3. Inspect all rubber fuel hoses for cracks, delamination and abrasions. Pay special attention to the areas where the hoses are bent and where they are connected to the system components.
9. When replacing, use only hoses specifically designed for fuel systems.
Metal pipelines
10. Metal pipes are often used in sections from the fuel pump to the injection system units. Inspect the pipes along their entire length and make sure that there are no sharp bends, kinks or cracks.
11. If a section of tubing needs to be replaced, use only seamless steel tubing, as aluminum and copper tubing are not strong enough to withstand engine vibrations.
12. Check the condition of the brake metal pipes and the reliability of their fittings at the points of connection to the main brake cylinder. Any signs of brake fluid leakage should be a signal for an immediate inspection of the brake system.