Subaru Legacy

Since 1990-1998 of release

Repair and car operation

Subaru Legasi
+ 1.1. Identification numbers
+ 2. Maintenance service
- 3. Engines
   3.1. Technical characteristics
   3.2. Operations on repair of the engine established in the car
   3.3. The top dead point of the first cylinder
   3.4. A cover of a head of the block of cylinders
   3.5. An inlet collector
   + 3.6. A 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. The oil pallet
   3.12. The oil pump
   3.13. The Flywheel / a drive plate
   3.14. Replacement of a back sealing ring of a cranked shaft
   3.15. A suspension bracket of the power unit
   - 3.16. Engine major repairs
      3.16.1. Technical characteristics
      3.16.2. Compression check
      3.16.3. Check of the engine by means of the vacuum gauge
      3.16.4. Recommendations about engine removal
      3.16.5. Engine removal
      3.16.6. Sequence of dismantling of the engine
      3.16.7. Dismantling of a head of the block of cylinders
      3.16.8. Clearing and survey of a head of the block of cylinders
      3.16.9. Assemblage 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 from rods
      3.16.13. The block of cylinders of the engine
      3.16.14. Хонингование cylinders
      3.16.15. Rods
      3.16.16. A cranked shaft
      3.16.17. Survey radical and шатунных bearings
      3.16.18. Engine balance of assembly at major repairs
      3.16.19. Survey of pistons
      3.16.20. Check of working backlashes шатунных bearings
      3.16.21. Check of working backlashes of radical bearings of a cranked shaft
      3.16.22. Assemblage of sections of the block of cylinders
      3.16.23. Installation of piston rings
      3.16.24. Installation of pistons
      3.16.25. Engine installation
      3.16.26. Start of the engine after major repairs
+ 4. Heating, ventilation
+ 5. Fuel system
+ 6. An exhaust system
+ 7. Systems of start, ignition
+ 8. Transmissions
+ 9. Coupling, shaft
+ 10. Brake system
+ 11. A suspension bracket
+ 12. A steering
+ 13. A body
+ 14. An electric equipment

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3.16.2. Compression check

In case of reduction of capacity of the engine which is not defect of ignition or fuel system, compression check can define an engine condition. If check is carried out regularly, it is possible to define defect which will be shown in the near future.

The engine should be heated-up to working temperature. Oil level should correspond to norm and the accumulator is completely charged. The help of other person also is required.

1. Unscrew from the engine all spark plugs.
2. Disconnect electric sockets from the coil of ignition and the fuel pump.
3. Screw in a tip компрессометра in an aperture of a spark plug of cylinder N 1.
4. The assistant should press against the stop a pedal of an accelerator and turn the engine a starter within several seconds. Thus it is necessary to observe of indications компрессометра.
5. Pressure will grow quickly enough at the serviceable engine. Low pressure upon the first piston stroke accompanied by gradual increase in pressure at following courses specifies in the worn out piston rings.
6. Low pressure upon the first course which does not raise further, specifies in leaky valves or the punched lining of a head of the block of cylinders.
7. Adjournment on an underside of plates of valves can promote low pressure also. Make record of the high pressure. Then repeat procedure for the remained cylinders.
8. Because of a variety компрессометров and speeds of rotation of a cranked shaft of the engine a starter the data often differs at compression check. For this reason actual pressure of compression is not underlined, however the most important factor is that pressure should be identical in all cylinders.
9. Add in cylinders insignificant quantity of engine oil (approximately 20 sm3) through an aperture for spark plugs and then repeat tests. If there is a pressure increase after oil is added, indicative that piston rings are worn out.
10. If pressure does not increase, available leak in valves or a lining of a head of the block of cylinders. Leak of valves can be caused the burnt saddles or plates of valves or погнутыми valves.
11. If two adjacent cylinders have equally low pressure, it is the most probable that the lining of a head of the block of cylinders has burnt through between them. Occurrence of a cooling liquid in the chamber of combustion or on щупе for measurement of level of engine oil confirms this defect.
12. If pressure in one cylinder approximately on 20 % more low, than in other and the engine has slightly rough mode of idling, the worn out cam on distributive to a shaft can be the reason of it.
13. After compression check establish spark plugs and connect electric sockets to the coil of ignition and the fuel pump.