Service of valves. BMW the 5th E28/E34 series (from 1981 to 1993 of release)
Repair of BMW E28 and series E34 from 1981 to 1993
1. Cars of the BMW brand of 5-series
2. Engine
2.1. The repair work which is carried out without extraction of the engine from the car
2.2. Procedures of major maintenance of components of the engine
2.2.1. General information
2.2.2. General information about major maintenance of the engine
2.2.3. Check of extent of compression
2.2.4. Ways of removal of the engine and precautionary measure
2.2.5. Removal and engine installation
2.2.6. Options of major maintenance of the engine
2.2.7. An order of dismantling of the engine at major maintenance
2.2.8. Dismantling of a head of cylinders
2.2.9. Cleaning and check of a condition of a head of cylinders and components
2.2.10. Service of valves
2.2.11. Assembly of a head of cylinders
2.2.12. Removal of pistons / rods
2.2.13. Removal of a cranked shaft
2.2.14. Removal and check of a condition of an intermediate shaft
2.2.15. Cleaning of the block of cylinders
2.2.16. Check of a condition of the block of cylinders
2.2.17. Honingovaniye of cylinders
2.2.18. Check of a condition of pistons / rods
2.2.19. Check of a condition of a cranked shaft
2.2.20. Check of a condition of radical and shatunny bearings
2.2.21. Engine balance of assembly at major maintenance
2.2.22. Installation of piston rings
2.2.23. Installation of an intermediate shaft
2.2.24. Installation of a cranked shaft and check of lubricant gaps of radical bearings
2.2.25. Installation of a back epiploon of a cranked shaft
2.2.26. Installation of pistons / rods in collecting and check of lubricant gaps in bearings of rods
2.2.27. Start and an engine running in after major maintenance
2.2.28. Diagnostics of malfunctions of the engine
3. Cooling system
4. Power supply system
5. Ignition system
6. Control systems of the engine and decrease in toxicity of the fulfilled gases
7. System of production of the fulfilled gases
8. Coupling
9. Manual box of gear shifting (RKPP) and automatic transmission (AT)
10. Transmission line
11. Steering and suspension bracket
12. Brake system
13. Body
14. Control body sizes
15. Heater and air conditioner
16. System of onboard electric equipment
17. Routine maintenance of the car
18. Size table and adjusting data
19. Schematic electric circuits
20. Governing bodies and operation receptions
21. System of onboard diagnostics - a principle of functioning and codes of malfunctions


2.2.10. Service of valves


  1. Check a condition of valves as it is described in the Section Cleaning and check of a condition of a head of cylinders and (item 2 and 1) components. Replace all valves having wear tracks or damages.
  2. If valves at this stage of check seem satisfactory, by a micrometer measure in several points diameter of a core of the valve. Any appreciable difference in indications of a measuring instrument testifies to wear of a core of the valve. If any of these conditions takes place, it is necessary to replace the valve (valves).
  3. If satisfactory, them it is necessary to grind in a condition of valves in the corresponding saddles to provide tightness. If the saddle has insignificant dents or it already was exposed to boring, they should be ground in thin polishing paste. Usually large polishing paste do not use, if only the saddle has no strong прогаров or deep dents. In that case the head of cylinders and valves should be checked by the expert to make the decision on boring of a saddle or even on valve or saddle replacement.
  4. Grinding in of valves is made as follows. Overturn a head and establish on a workbench, having enclosed from both parties tree whetstones to provide a gap with cores of valves.
  1. Put on a facet of a saddle of the valve a small amount of polishing paste of the corresponding granularity and attach to a valve head a sucker of the polishing tool. Grind in a valve head to a saddle returnable rotary motions, periodically for redistribution of polishing paste raising the valve. Be not overzealous.

If under a head of the valve to establish not a hard spring, operation on grinding in will be considerably facilitated.

  1. If large polishing paste is used, it is necessary to make grinding in until on a saddle and the valve not will equal opaque surfaces are reached, then it is necessary to remove paste and to repeat process with thin polishing paste. Operation on grinding in will be complete, when on the valve and a saddle smooth light gray opaque surfaces without gaps will be received. Do not grind in valves more than it is necessary.
  2. After grinding in of all valves before assembly of a head of cylinders carefully wash away all traces of pritirochny paste, using for this purpose kerosene or suitable solvent.

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2.2.9. Cleaning and check of a condition of a head of cylinders and components
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2.2.11. Assembly of a head of cylinders