1992-1997 of release
Repair and car operation
+ General data
+ 1. Maintenance
+ 2. Engine
+ 3. Six-cylinder V6 engines
- 4. Major maintenance of engines
4.2. General information
4.3. Compression check
4.4. Recommendations about engine removal
+ 4.5. Removal and engine installation
4.6. Sequence of dismantling of the engine
4.7. Dismantling of a head of the block of cylinders
+ 4.8. Cleaning and survey of a head of the block of cylinders
4.9. Assembly of a head of the block of cylinders
4.10. Removal of pistons with rods
4.11. Removal of a cranked shaft
+ 4.12. Block of cylinders of the engine
4.13. Pistons and rods
4.14. Cranked shaft
- 4.15. Survey and choice of radical and shatunny bearings
+ 4.15.2. Choice
4.16. Control люфта balance weight assemblies (engine 5S-FE)
4.17. Engine balance of assembly at major maintenance
4.18. Installation of piston rings
+ 4.19. Installation of a cranked shaft and check of working gaps of bearings
4.20. Installation of a back sealing ring of a cranked shaft
4.21. Installation of pistons and rods, check of working gaps of bearings
4.22. Installation of assembly of the balance weight (engine 5S-FE)
4.23. Engine start after major maintenance
+ 5. Cooling and heating
+ 6. Fuel system
+ 7. Ignition system
+ 8. Toxicity fall
+ 9. Transmission
+ 10. Automatic transmission
+ 11. Coupling and power shafts
+ 12. Brake system
+ 13. Suspension bracket
+ 14. Body
+ 15. Electric equipment
Typical defects of bearings
Even thus that radical and shatunny bearings are subject to replacement at major maintenance of the engine, they are necessary for examining carefully as they can give valuable information concerning an engine condition.
Failure of the bearing can occur because of a lack of greasing, presence of dirt or other alien particles, an engine or corrosion overload. Независи мо from the reason of failure of the bearing the reason which has caused an exit of the bearing out of operation before the engine should be eliminated will repeatedly gather.
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 various ways. Metal particles can is in engine oil as a result of normal wear of the engine. Small particles together with engine oil can get in подшипни ки and easily take root into a 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 engine assembly. 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 leakage of oil. The manner of driving by the car also influences 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 a working part of the bearing that weakens the bearing and can lead to a separation of an antifrictional layer from a steel basis.
Movement on short distances leads to corrosion of bearings as a result the engine does not leave on the stabilized working temperature at which water vapor and corrosion gases are removed. These pairs and gases, конденси руясь 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 engine assembly also leads to failure of bearings. The bearings established with a preliminary tightness, leave недоста an exact working gap of the bearing therefore уменьша ется or there is no butter layer for greasing.