|
Audi A4, S4Since 2000 of releaseRepair and car operation |
|
Audi A4, S4 + Introduction + Controls and receptions of safe operation + Current leaving and service - The engine Specifications Removal and installation of the top cover of the engine / the bottom protection of an impellent compartment/stretcher Compression check in engine cylinders, revealing of leaks Check of the engine by means of the vacuum gauge + 4-cylinder petrol engines + 6 and 8-cylinder petrol engines + 4-cylinder diesel engines + 6-cylinder diesel engines + System of greasing of the engine + Systems of cooling, heating and the air conditioner + Power supply systems, release and decrease in toxicity of the fulfilled gases + Systems of an electric equipment of the engine + Manual box of a gear change + Automatic transmission + Coupling, power shafts and differential + Brake system + Suspension bracket and steering + Body + Onboard electric equipment |
Compression check in engine cylinders, revealing of leaks Compression check The compression provides guidance on an engine condition. Results of check show, whether valves and pistons (piston rings) are perfectly in order, or they are worn out. Whether Besides, results of check allow to make decision to replace the engine, whether the complete repair is required to it or to replace a sealing lining of a head of cylinders enough. For check it is required компрессометр which for petrol engines is offered in specialised shops under the reasonable price.
As much as possible admissible difference of pressure in separate cylinders can make 3.0 атм. (For diesel engines 5.0 атм.). Pressure of a compression grows in the serviceable engine very quickly. The low value shown after the first cycle, increasing with the subsequent cycles, specifies in deterioration of piston rings. Low value after the first cycle, not increasing after the following, signals that or valves негерметичны, or the lining of a head of the block (by the reason also is punched there can be a crack in a head). In compression decrease can result deposit presence on plates of valves. It is necessary to mean that because of different speed of rotation of a starter on different models the results received as a result of measurements can differ. The results received at measurement of a compression, should be about identical to all cylinders. If pressure is in any cylinder at level minimum admissible and even more low for reason finding-out execute to a trace ющие actions. Pour in in the cylinder through an aperture for a candle a teaspoon of impellent oil and repeat compression measurement. If oil addition has temporarily improved a compression, the reason of its decrease, most likely, is deterioration of the piston, rings or the cylinder. If the compression increase has not occurred, it is possible to assume that the reason — in негерметичности valves or the punched lining of a head of the block. Low compression in two next cylinders almost for certain — a consequence of breakdown of a lining of a head. Presence of a cooling liquid in chambers of combustion or in картере the engine will confirm this assumption. If a compression in one of cylinders approximately on 20 % more low, than in the others, besides idling turns are astable, the reason, probably, excessive deterioration of a cam of a cam-shaft. After check end establish to the place of a spark plug (address to the Head Current leaving and service, put on them tips of high-voltage wires, attach a socket to the ignition coil. Establish into place a plastic cover of the engine and a safety lock of the fuel pump. Values of pressure of a compression for various engines are resulted in Specifications. The petrol engine
Diesel engines
Check on leaks During the given check are defined speed of an exit from cylinders закачанного in them of the compressed air and it is direct places of leaks. The given check is alternative to compression check. Moreover, from many points of view it is much more effective as visually to reveal a source of leak easier, than to comprehend results of measurement of a compression. The equipment necessary дляпроверки on leaks, does not concern to popular, therefore performance of the given check should be entrusted experts of the service centre. |
home |