VW Passat B5

since 1996 release

Repair and operation of the car



Foltsvagen Passat B5
+ Maintenance instruction
+ 1. Maintenance
- 2. Engines
   2.2. General information
   2.3. Lower mudguard of a motor compartment
   + 2.4. Four-cylinder petrol engine
   + 2.5. Diesel engine 1,9-I-TDI
   + 2.6. Drive of the gas-distributing mechanism
   - 2.7. Engine 2,8-I-V6
      2.7.2. Removal and installation of a head of the block of cylinders
      2.7.3. Check of a compression in engine cylinders
      2.7.4. Check of the engine by means of the vacuum gage
      2.7.5. Removal and installation of a poliklinovy belt
      2.7.6. General recommendations about engine oils
      2.7.7. Circulation of engine oil
      2.7.8. Check of pressure of oil and sensor of pressure of oil
      2.7.9. Removal and installation of the oil pallet
      2.7.10. Start of the engine after capital repairs
      2.7.11. The main malfunctions at start of the engine
      2.7.12. Main malfunctions of the lubrication system
+ 3. Cooling system
+ 4. Fuel system
+ 5. Engine management
+ 6. Exhaust system
+ 7. Transmission
+ 8. Running gear
+ 9. Steering
+ 10. Brake system
+ 11. Body
+ 12. Heating, ventilation
+ 13. Electric equipment






2.7.4. Check of the engine by means of the vacuum gage

GENERAL INFORMATION

Basic provisions and fluctuations of an arrow of the vacuum gage at diagnostics of malfunctions of the engine


Using the vacuum gage, it is possible to obtain information on a condition of the engine and to define that laying of a head of the block of cylinders is punched, rings are damaged, the power supply system is incorrectly adjusted, valves etc. are damaged. Unfortunately, indications of the vacuum gage can be interpreted incorrectly therefore these measurements need to be used only in combination with other methods of check of the engine. Both absolute value of indications of the vacuum gage, and speed of their change are important for the correct definition.

PERFORMANCE ORDER
1. Connect the vacuum gage to an inlet collector. Start and warm up the engine up to the normal working temperature.
2. Consider indications of the vacuum gage. If the engine is in the normal state, indications of the vacuum gage have to be 430–560 mm Hg, and the arrow vakuummt ра has to stand still.
Low constant indications of the vacuum gage demonstrate that laying between an inlet collector and the case of a throttle is damaged, the vacuum hose is damaged, the moment of ignition or the wrong installation of phases of gas distribution is incorrectly determined.
If indications of the vacuum gage are lower than norm on 80–200 mm Hg and fluctuate, then, perhaps, laying of an inlet collector near an entrance opening is damaged or the injector is faulty.
If indications constantly fall on 50–100 mm Hg rather steadily го values, then, perhaps, valves are damaged. In this case it is necessary to measure a compression in engine cylinders.
If indications fall, but is not regular, then, perhaps, gets jammed the valve or there is a failure in ignition.
Small fluctuations about 25 mm Hg are usually connected with failures in system of ignition.
If indications strongly fluctuate, then, perhaps, laying of a head of the block of cylinders or the cylinder is damaged.
If the arrow slowly moves over a wide range of values, then, perhaps, the system of compulsory ventilation of a case is littered, laying of an inlet collector or laying between the case of a butterfly valve and a collector is damaged.
3. Check, how fast восстанав indications of the vacuum gage after sharp and full opening of a butterfly valve and its return to a starting position livatsya. If the engine is in the normal state, indications reduce almost to zero, then norms increase about 130 mm Hg above and again decrease to former values at constant turns of idling. If indications are restored slowly and pass through a maximum after closing of a butterfly valve, then, perhaps, piston rings are damaged. If there is a long delay, then, perhaps, the exhaust system is littered.
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