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Mercedes S-Class W-140In 1991-1999 editionsRepair and enterprise of the car |
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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 the motor by means of vacuum meter Basic provisions and fluctuations of an arrow of meter of vacuum at diagnostics of defects of the motor
Using vacuum meter, it is possible to obtain information on a condition of the motor and, to define that transferring of the head of the block of cylinders is punched, the system of power supply is damaged, rings are damaged, the system of power supply is settled mistakenly, these are gates, etc. Unfortunately, in the damaged state, statements of meter of vacuum can be interpreted mistakenly therefore it is necessary to use these measurements in a combination with other methods of check of the motor. Both absolute value of statements of meter of vacuum, and speed of its change is important for the correct definition.
Low constant statements of meter of vacuum demonstrate that transferring is damaged between the pipeline of access and a body of a thrush, the hose of vacuum is damaged, the moment of ignition or the wrong device of phases of management of gas exchange is defined mistakenly. If it is lower to the statement of meter of vacuum as norm on 80 - 200 Torr and rise, to it, perhaps, transferring of the pipeline of access is damaged near entrance opening or inschektor is wrong. If statements fall on 50 - 100 Torr concerning stable value, it, perhaps constantly, gates are damaged. In this case it is necessary to measure compression in the motor cylinder. If statements fall, but is not regular, to it, perhaps, the gate or it gets jammed violation occurs in ignition. If statements with an amplitude quickly rise along with 100 Torr, at continuous changes of idling, and there is from Ausblaserohr a smoke, perhaps, are damaged judging bank of gates. If statements rise at increase in changes of idling, to it, perhaps quickly, transferring of the pipeline of access or transferring of the head of the block of cylinders is damaged, feathers of gates are weakened, gates burned it or there is a violation in ignition. Small fluctuations along with 25 Torr are connected with violations in system of ignition usually. If statements, to it perhaps strongly rise, transferring of the head of the block of cylinders or cylinders is damaged. If to itself the arrow in a big frame of values, to it, perhaps slowly moved, polluted system of the operated ventilation of kartera, transferring of the pipeline of access or transferring is damaged between a body drosselnoj saslonki and the pipeline. Check as far as statements of meter of vacuum after strong and full opening of drosselnoj saslonki and its reset are quickly restored. If the motor is in the normal state, statements fall almost up to zero, then it grow, for example, 130 Torr above than norms also are again reduced to former values at continuous changes of idling. If statements are slowly restored and go a maximum after closing of drosselnoj saslonki, it, perhaps, piston rings are damaged. If there is a long delay, it, perhaps, the system of an exhaust polluted. |
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