|
|
Mercedes S-Class W-140In 1991-1999 editionsRepair and enterprise of the car |
|
|
Mercedes S-Class + Mercedes Benz cars of the class S (W-140) + operation manual + Routine maintenance - Motor Check of compression in the motor cylinder Check of the motor by means of vacuum meter Serpantinnogo belt of an incentive of auxiliary devices + 6-cylinder petrol engines (M104.944 and M104.990/994) + 8-cylinder petrol engines (M119.970/981 and M119.971/981) + 12-cylinder petrol engines (M120.980/982) + 6-cylinder diesel engines (OM603.971) + 6-cylinder diesel engines (OM606.961) + cooling systems, heating + systems of power supply and edition + electric equipment of the motor + gear shifting boxes + Awtomatitscheckaja transmission + connection + brake system + Aufhängung and management + body + electric onboard equipment |
Check of compression in the motor cylinder Compression gives an idea of a condition of the motor. Results of check conduct, whether it be as it should be gates and the piston (piston rings) before, or them are worn-out. Whether allow, besides, results of check to make the decision, to replace the motor whether it is required to it complete repair or to replace uplotnitelnuju transferring of the head of cylinders enough. For check it is required to kompressometr which is offered for petrol engines in the allocated affairs after the available price.
The motor has to be heated up to working temperature, the battery - is invited completely. To you also demand the help of the assistant. Pull out the protection device of the pump for fuel from the installation block, (address the head to the electric onboard equipment). Start the motor and expect until it is saglochnet. If the motor is not conducted, win a starter along with 10 seconds. For receiving access to spark plugs you accept a cover of maslosaliwnoj of a neck and you delete Plastkappe of the motor. Establish a cover into place. Switch off system of ignition, the excluded ignition coil plug. Pull all spark plugs (outside watch office check and compensation of spark plugs, check of a condition of high-voltage lines (petrol models) of the head Routine maintenance). Establish kompressometr in opening of a candle of the first cylinder. It would be desirable to use kompressometrom which top is screwed up in opening of a candle. You ask the assistant that he considered a pedal of the pedal of an accelerator which is completely pressed and that it accepted a starter. After several cycles compression in the cylinder will reach the maximum value and will change no more. Write down the received result. Extreme distinction of pressure in the separated cylinder can form 3.0 bars (for diesel engines of 5.0 bars). Compression very quickly grows in the serviceable motor. Low value which is shown after the first cycle is more and more with the following cycles, designates on sale of piston rings. Low value after the first cycle, is not more and more after the following, signals about it that either negermetitschny gates, or transferring of the head of the block (the reason be punched also the crack can in the head). Existence of formation of soot on plates of gates can lead to compression immersion. It is necessary to think it is necessary that because of various speed of Drehens of a starter on various models the results received owing to measurements can differ. Results which are received at compression measurement have to be approximately identical for all cylinders. If pressure is in some cylinder at height is minimum admissible and it is even lower, then you fill the following actions for a reason explanation. Pour in the cylinder opening for a candle a teaspoon of engine oil and repeat compression measurement. If oil addition improved compression over time, the reason of its immersion is a sale of the piston, rings or the cylinder after all probability. If there was no increase in compression, then it is possible to assume that the reason - in negermetitschnosti of gates or the punched transferring of the head of the block. Low compression in 2 next cylinders, almost of course - a research of a breach of transferring of the head. Availability of the cooled liquid in cameras of burning or in kartere of the motor will confirm this reception. If it is 20% lower in one compression from cylinders, for example, on, than in for the rest, for this purpose idling changes, according to the reason, are possible, unstable the increased Fäustchens raspredwala sale. After the end of check you put to the place of a spark plug (firmly address the head to Routine maintenance), put on them tops of high-voltage lines, connect the plug in the ignition coil. Establish into place a plastic cover of the motor and the protection device of the pump for fuel. Values of pressure of compression for various motors are given in specifications. Check on a vytecheniye During this check exit speed from the sakatschannogo cylinder in them compressed air and it directly places of a vytecheniye clear up. This check is an alternative of check of compression. Besides, from many points of view it is much more effective as it is simple to give Ausfließens source optically in day to think over as results of measurement of compression.The equipment which is necessary for check on a vytecheniye does not behave too popularly therefore it is necessary to trust execution of this check to experts of the center of service. |
|