Saab 9-5
+ Cars Saab 9-5
+ Controls and operation receptions
+ Options and car routine maintenance
- The engine
The general information and preparatory operations
Check компрессионного pressure
Check of the engine by means of the vacuum gauge
+ Repair of 4-cylinder petrol engines
+ Repair of 6-cylinder petrol engines
+ Repair of 6-cylinder diesel engines
+ Systems of cooling of the engine, heating, ventilation and air conditioning
+ The power supply system and release of the fulfilled gases
+ Systems of an electric equipment of the engine
+ Manual box of a gear change
+ Automatic transmission
+ Coupling and power shafts
+ Brake system
+ Suspension bracket and steering
+ Body
+ Onboard electric equipment
|
Check of the engine by means of the vacuum gauge
Using the vacuum gauge, it is possible to receive the information on a condition of the engine and to define that the lining of a head of the block of cylinders is punched, the power supply system is damaged, piston rings are damaged, the system of injection of fuel is incorrectly adjusted, valves etc. Unfortunately are damaged, vacuum gauge indications can be interpreted incorrectly, therefore these measurements should be used in a combination to other methods of check of the engine. For correct definition are important both absolute value of indications of the vacuum gauge, and speed of their change.
Variants of indications of the vacuum gauge at diagnostics of malfunctions of the engine
|
|
Connect the vacuum gauge to the inlet pipeline. Start and warm up the engine to normal working temperature.
Consider vacuum gauge indications.
If the engine is in a normal state, vacuum gauge indications should be constants and make 430 - 560 mm hg
Low constant indications of the vacuum gauge testify to lining damage between the inlet pipeline and the throttle case, damage of the vacuum hose, incorrectly established moment of ignition or incorrectly established phases timing.
If indications of the vacuum gauge below norm on 80 - 200 mm hg also fluctuate, that, probably, the lining of the inlet pipeline near to an entrance aperture is damaged or the injector is faulty.
If indications constantly fall on 50 - 100 mm hg concerning stable value, that, probably, valves are damaged. In this case it is necessary to measure a compression in engine cylinders (the Section Check компрессионного pressure see).
If indications fall, but is not regular, that, probably, gets jammed the valve or there is a failure in ignition.
If at constant turns of idling of the indication quickly fluctuate with amplitude about 100 mm hg, and from an exhaust pipe there is a smoke, probably, directing plugs of valves are damaged.
If indications quickly fluctuate at increase in turns of idling, that, probably, the lining of the inlet pipeline or a lining of a head of the block of cylinders is damaged, springs of valves are weakened, valves have scorched or there is a failure in ignition.
Small fluctuations about 25 mm are hg usually connected with failures in ignition system.
If indications strongly fluctuate, that, probably, the lining of a head of the block of cylinders or the cylinder is damaged.
If the arrow slowly moves largely values, that, probably, the system of operated ventilation картера is littered, the lining of the inlet pipeline or a lining between the case throttle заслонки and the pipeline is damaged.
Check up, indications of the vacuum gauge after sharp and full opening throttle заслонки and its reset are how fast restored. If the engine is in a normal state, indications fall almost to zero, then increase approximately on 130 mm hg above norm and again decrease to former values at constant turns of idling. If indications are restored slowly and pass through a maximum after closing throttle заслонки, that, probably, piston rings are damaged. If there is a long delay, that, probably, the system of release ОГ is littered.
|
|
|
|