Installation of piston rings. 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


2.2.22. Installation of piston rings

Before installation of new piston rings it is necessary to check gaps in piston rings. It is supposed that lateral gaps of piston rings were already measured and checked (look the Section Check of a condition of pistons / rods).


  1. Spread out pistons/rods in collecting and new sets of rings so that they corresponded to the same pistons and cylinders with which their face gaps were measured and in which they will be established at engine assembly.
  1. Insert the top ring into the first cylinder and establish it perpendicular to a cylinder wall, having pushed it the piston bottom. The ring should be in the lower part of the cylinder in the bottom point of the engine of a ring.
  1. For measurement of a face gap insert between its ends щуп which thickness is equal to width of a gap. Shchup should pass between the ring ends with easy resistance. Compare result of measurement to requirements of the Size table and adjusting data at the end of the Management. If the gap is more or less, than it is required before operating further, once again check, whether the correct are acquired rings.
  1. If the gap is too small, it should be increased, differently the ring ends at operation of the engine will meet together that can lead to serious damage of the engine. The gap can be increased, very carefully having filed it a small file. Clamp a file in a vice with elastic sponges, put on a ring a file so that the ends of a ring rested against its surfaces and for material removal slowly move a ring. Carrying out this operation, move a ring only from the file end by the beginning.
  1. Too big gap is not critical, if it does not exceed 1.0 mm. Again check once again, whether the correct are acquired rings.
  2. Repeat procedure for each ring of the first cylinder and for each ring of other cylinders. Do not forget about compliance of rings, pistons and cylinders.
  3. When gaps between the ends of rings are carried out/are modified, it is possible to establish rings on pistons.
  1. Usually to the first establish a maslosjemny ring (the lowermost on the piston). As a rule, it consists of three separate components. Establish in a flute a radial/axial dilator. If there is a uvula for rotation elimination, be convinced that it is inserted into an opening drilled in a flute.
  1. Further establish the bottom disk. At installation of disks of a maslosjemny ring do not use the tool for installation of piston rings as they can be damaged. Instead arrange one end of a disk in a flute between a radial / axial dilator and a flute wall, strong hold it on a place and a ring lead round round the piston, filling a disk in a flute. Further in the same way establish the top disk.
  1. After installation of three components of a maslosjemny ring check, that the top and bottom disks easily moved in a flute.
  2. To the following establish an average ring. Usually the label which should be turned up, towards the piston bottom is put on it.

Always follow the instructions printed on packing of rings or on a box - different producers can establish different requirements. Do not mix the top and bottom rings as they have various cross-section sections.

  1. Be convinced that the identification label is turned towards the piston bottom, then establish a ring in an average flute of the piston (look drawing). It is not necessary to unclench a ring more, than it is necessary for putting on on the piston. Apply the high-quality tool to installation of rings if it is available; that rings did not get to empty flutes it is possible to use old flat щупы.
  2. In the same way establish the top ring. Be convinced that the label is turned up. Be attentive and do not mix the top and average rings.
  3. Repeat procedure for other pistons and rings.

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2.2.21. Engine balance of assembly at major maintenance
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2.2.23. Installation of an intermediate shaft