General remarks
When removing and installing flexible pipes and hoses, follow the instructions below. This is a guarantee of reliable and durable operation.
- Before removing the brake hoses or power steering hoses, thoroughly clean the hose connections and the surrounding area.
- Remove suitable plugs or caps before disconnecting hoses. After disconnecting the hose, immediately plug the openings in the housing or fitting to prevent dirt from entering the system.
- Clean the removed hoses from the outside and blow through with compressed air inside. Inspect the pipeline carefully. Pay attention to the presence of cracks, detachment of the cord, the reliability of the termination of the tips. All hoses that are damaged must not be reinstalled.
- Avoid sharp bends when installing the hose. After tightening the fastening nuts, the hose must not be twisted.
- After removing the hose, plug the connecting fitting with a cap; if the hose has a connection with a pressure nut, plug the corresponding hole in the body with a plug.
- Absolute cleanliness must be observed at all times when working with hydraulic system components.
- After any work on hydraulic systems, check for leaks. To do this, one person must be under the car and carefully inspect the joints, and the other, while driving the car, must, with the engine running, press the brake pedal as hard as possible or turn the steering wheel.
Engine Power Hoses
All fuel hoses have two layers: an outer layer of reinforced rubber and an inner layer of special rubber. When removing any fuel hose, carefully inspect its inner layer. The inner layer should not have delaminations from the outer shell of reinforced rubber. If detachment is found, the hose should be replaced with a new one.
Connecting clamps of hoses of the power supply system of the engine
Some fuel hoses have torque controlled clamps. The screw head of these clamps has a special slot, the edges of which, when the set tightening torque is reached, are crushed, not allowing the tightening force to be increased more than the set limit. Such clamps can be untwisted with an ordinary screwdriver. When reassembling, these clamps must be replaced with new clamps with automatic torque adjustment. Clamps with automatic torque control should be tightened to the point where the slot edges are sheared. These clamps should not be tightened in any other way, such as with a socket wrench.
Engine cooling hoses
It is MANDATORY to follow the instructions below to avoid damaging the cooling system hoses and their mating pipes.
Mutual position of the hose and pipe
To avoid damage or fatigue failure of the hose, connect the hose to the connector correctly. If the hose and fitting are marked with pairing, then they should only be connected in this position. During installation, the hose must be completely pushed onto the connecting pipe. Usually there is a special shaped tide on the nozzle, which allows you to correctly assemble the connection.
Clamps
The hose is usually marked with markings that indicate the correct position of the clamp. If there are no marks, then the clamp should be located directly behind the shoulder at the end of the connecting pipe, as shown in the figure. The flare of the worm clamp should be directed towards the proximal end of the hose. Otherwise, the hose may be pinched between the clamp and the collar of the nozzle. Worm drive clamps must be tightened to 3 Nm unless otherwise specified. After tightening the clamp, make sure that the clamp does not interfere with adjacent parts.
Clamps type "Oetiker" dismantled after extension of the tongue (in the figure is indicated by an arrow) and release of the outer branch of the collar. Clamps of this type are not subject to further use. When installing a new clamp, ensure the correct position of the clamp on the hose, when tightening the clamp, align the tongue with the longitudinal slot on the outer branch of the clamp (the figure is shown by the arrow).
Parts overheating protection
All provided thermal and protective shields must be installed and in good condition. If damage to these elements is noticeable, they must be replaced. Pay attention to the installation of hoses adjacent to very hot engine parts, such as the exhaust manifold and pipes of the exhaust gas recirculation system (EGR). When heated, the hoses will deform. This must be taken into account when laying and securing hoses.
Comments on this article