Subaru Legacy

since 1990-1998 release

Repair and operation of the car



Subaru of Legasi
+ 1.1. Identification numbers
+ 2. Maintenance
- 3. Engines
   3.1. Technical characteristics
   3.2. Operations on repair of the engine installed in the car
   3.3. Top dead point of the first cylinder
   3.4. Cover of a head of the block of cylinders
   3.5. Inlet collector
   + 3.6. Gear belt and pulleys
   3.7. Replacement of a forward sealing ring of a cranked shaft
   3.8. Replacement of sealing rings of camshafts
   3.9. Camshafts and pushers
   3.10. Heads of the block of cylinders
   3.11. Oil pallet
   3.12. Oil pump
   3.13. Drive flywheel / plate
   3.14. Replacement of a back sealing ring of a cranked shaft
   3.15. Suspension bracket of the power unit
   - 3.16. Capital repairs of the engine
      3.16.1. Technical characteristics
      3.16.2. Check of a compression
      3.16.3. Check of the engine by means of the vacuum gage
      3.16.4. Recommendations about removal of the engine
      3.16.5. Removal of the engine
      3.16.6. Sequence of dismantling of the engine
      3.16.7. Dismantling of a head of the block of cylinders
      3.16.8. Cleaning and survey of a head of the block of cylinders
      3.16.9. Assembly of a head of the block of cylinders
      3.16.10. Removal of pistons
      3.16.11. Division of sections of blocks of cylinders
      3.16.12. Removal of a cranked shaft with rods
      3.16.13. Block of cylinders of the engine
      3.16.14. Honingovaniye of cylinders
      3.16.15. Rods
      3.16.16. Cranked shaft
      3.16.17. Survey of radical and shatunny bearings
      3.16.18. Balance of assembly of the engine at capital repairs
      3.16.19. Survey of pistons
      3.16.20. Check of working gaps of shatunny bearings
      3.16.21. Check of working gaps of radical bearings of a cranked shaft
      3.16.22. Assembly of sections of the block of cylinders
      3.16.23. Installation of piston rings
      3.16.24. Installation of pistons
      3.16.25. Installation of the engine
      3.16.26. Start of the engine after capital repairs
+ 4. Heating, ventilation
+ 5. Fuel system
+ 6. Exhaust system
+ 7. Systems of start, ignition
+ 8. Transmissions
+ 9. Coupling, shaft
+ 10. Brake system
+ 11. Suspension bracket
+ 12. Steering
+ 13. Body
+ 14. Electric equipment


3a942d17


3.16.3. 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 receive 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. Are important for the correct definition both absolute value of indications of the vacuum gage, and speed of their change.

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 a normal state, indications of the vacuum gage have to be 430–560 mm Hg, and the arrow of the vacuum gage has to stand still.
3. Low constant indications of the vacuum gage testify 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.
4. If indications of the vacuum gage are lower than norm on 80–200 mm Hg and fluctuate, that, possibly, laying of an inlet collector near an entrance opening is damaged or the injector is faulty.
5. If indications constantly fall on 50–100 mm Hg of rather stable value, perhaps, valves are damaged. In this case it is necessary to measure a compression in engine cylinders.
6. If indications fall, but is not regular, perhaps, gets jammed the valve or there is a failure in ignition.
7. If indications quickly fluctuate with an amplitude about 100 mm. rt. the St, at constant turns of idling, and from an exhaust pipe goes a smoke, perhaps, the directing plugs of valves are damaged.
8. If indications quickly fluctuate at increase in turns of idling, that, possibly, laying of an inlet collector or laying of a head of the block of cylinders is damaged, springs of valves are weakened, scorched the valve or there is a failure in ignition.
9. Small fluctuations about 25 mm Hg are usually connected with failures in system of ignition.
10. If indications strongly fluctuate, that, possibly, laying of a head of the block of cylinders or the cylinder is damaged.
11. If the arrow slowly moves over a wide range of values, that, possibly, 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.
12. Check, indications of the vacuum gage after sharp and full opening of a butterfly valve and its return to a starting position are how fast restored.
13. If the engine is in a 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.
14. If indications are restored slowly and pass through a maximum after closing of a butterfly valve, perhaps, piston rings are damaged. If there is a long delay, that, possibly, the exhaust system is littered.