Jeep Grand Cherokee

1993-1999 of release

Repair and car operation

Check of a condition and replacement of hoses passing under a cowl (each 4800 km (3000 miles) run or times in 3 months)

Hoses, as well as driving belts, tend to fail at the most inappropriate moment - in order to avoid the troubles connected with unforeseen delays in a way, make check of a condition of hoses as it is possible more carefully, using the map of the most typical defects given here.

General information

Replacement of hoses of central air of air should be left to specialists of dealer office or a specialized workshop of the car-care center, having at the order the equipment necessary for a safe discharge of system. At all do not remove any components of system and do not disconnect hoses before carrying out dumping of pressure.

High temperatures in an impellent compartment can be at the bottom of destruction of a material of the rubber and plastic hoses used in operation of the engine, auxiliary units and systems of decrease in toxicity of the fulfilled gases. Hoses should be checked regularly on existence of cracks, signs of weakening of collars, hardenings of a material and traces of leaks. Information on check of a condition of hoses of system of cooling is provided in the Section Check of serviceability of system of cooling (each 4800 km (3000 miles) run or times in 3 months).

Some, but not everything, hoses fasten on unions by means of collars. There where collars are applied, check reliability of their tightening on which the prevention of emergence of leaks depends. If collars are not used, track, that the hose did not appear expanded and/or hardened on the site put on the union that usually is at the bottom of leak emergence.

Vacuum hoses

For identification of the vacuum hoses which are especially applied in systems of decrease in toxicity of fulfilled gases use of a color code or introduction in their walls of color strips is characteristic. Various systems demand application of vacuum hoses of various thickness of walls on which resilience to a skhlopyvaniye under the influence of internal depression and to influence of the increased temperatures depends. At replacement of vacuum hoses watch compliance of a material and a design new removed from the engine.

Often, in the only effective way of check of a condition of a vacuum hose there is its complete removal from the car. If to removal are subject more than one hose, take care previously of their accurate marking for the purpose of the correct installation at assembly.

Checking a condition of vacuum hoses do not forget as well about plastic tees. Check them on existence of cracks and deformations of sites on which the hose stretches, capable to cause depression loss as a result of violation of tightness of a joint.

For identification of "leakages" of vacuum use a stethoscope, or - as that - a piece of a vacuum or fuel hose (internal diameter about 6 mm). Hear by means of a stethoscope to hoses (on all length) and their shtutserny connections on existence of the hissing being a characteristic sign of "leak".

When listening vacuum hoses by a stethoscope watch to touching moving components of an impellent compartment, such as a driving belt, fan blades, etc.

Fuel hoses

There are special precautionary measures which should be undertaken at carrying out service of components of a power supply system. Work should be made in well ventilated room. Approach to a venue of works with the lit cigaret, open fire or unprotected by the lamp shade carrying is most strictly forbidden. Casually spilled fuel should gather immediately by means of rags or paper towels which should then develop in inaccessible to fire or heat sources a place. On injector models the system of injection of fuel is under pressure, which should be dumped (for more details see. Head of the Power supply system and production of the fulfilled gases) before it will be possible to start a detachment of fuel lines.

Check rubber fuel lines on existence of signs of wiping or material aging. Especially check hoses on existence of cracks in places of a bend and on sites directly ahead of unions (such as on the fuel filter).

High-quality fuel lines are usually marked by an inscription of Fluroelastomer printed directly on a wall of a hose and should be applied to work of replacements. Do not try to establish at all instead of fuel lines not possessing demanded durability vacuum or water hoses, or transparent plastic tubes.

For fixing of fuel lines on unions collars of spring type are usually used. Such collars often lose the durability eventually, and at removal tend to an unexpected soskakivaniye. It will be reasonable to replace during replacement of hoses such collars with more reliable of screw (worm) type.

Metal lines

In a power supply system metal lines are often applied. Carefully check them on existence of excesses, deformations and signs of formation of cracks.

If the section of the metal line is subject to replacement, it is necessary to use for its performance only the steel tubes made on seamless technology as the copper and aluminum do not provide demanded durability for keeping taking place at normal operation of the engine of vibrating loadings.

Check metal brake lines in places of connection them to the main cylinder and the block of alignment of pressure (if that is provided) on existence of cracks or signs of weakening of shtutserny connections. Detection of any signs of leaks in brake lines demands immediate careful check of all brake system.