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

3.16.17. Survey of radical and shatunny bearings


Even besides that radical and shatunny bearings are subject to replacement at capital repairs of the engine, they need to be examined carefully as they can give valuable information concerning a condition of the engine.

Failure of the bearing can happen because of a lack of greasing, presence of dirt or other alien particles, an overload of the engine or corrosion. Irrespective of the reason of failure of the bearing the reason which caused a bearing exit out of operation has to be eliminated before the engine repeatedly gathers.

At survey of bearings remove them and spread out in the same order as they were established on the engine. It will allow to define the corresponding neck of a cranked shaft and will facilitate search of malfunctions.

Alien particles can get to the engine in various ways. Metal particles can be in engine oil as a result of normal wear of the engine. Small particles together with engine oil can get to bearings and easily take root into soft material of the bearing. Big particles, getting to the bearing, will scratch the bearing or a neck of a cranked shaft. The best prevention of failure of the bearing for this reason, carefully clear all internal surfaces of the engine and keep them clean at assembly of the engine. Also frequent and regular replacement of oil with the filter is recommended.

Insufficient greasing of necks of a cranked shaft can be caused by many different reasons, such as high temperature of oil, an overload of the engine and leak of oil.

The driving manner the car also has impact on durability of the bearing. Completely open butterfly valve at low turns of the engine creates high load of bearings and expression from a zone of contact of an oil film. These loadings lead to emergence of cracks in working part of the bearing that weakens the bearing and can lead to a separation of an antifrictional layer from a steel basis.

The movement on short distances leads to corrosion of bearings as a result the engine does not come to the stabilized working temperature at which water vapor and corrosion gases are removed. These couples and gases, being condensed in engine oil, form acid and a deposit. Acid together with engine oil gets to bearings and corrosion of bearings begins.

The wrong selection of bearings at assembly of the engine also leads to failure of bearings. The bearings installed with a preliminary tightness leave an insufficient working gap of the bearing therefore there is no butter layer for greasing.