Order of dismantling of the engine at major maintenance. 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
 








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2.2.7. An order of dismantling of the engine at major maintenance

It is essential to assort more simply the engine and to work with it at the portable stand. Often the stand can be leased cheaply in bureau of hire of tools. Before engine installation it is necessary to shoot with the stand the flywheel / leader a disk.

If the stand is inaccessible, the engine can be disassembled, having established it on a floor on wooden whetstones. Be especially careful not to incline it or not to drop, working without the stand.

If you are going to get the restored engine, all components specified below should be removed first of all to establish them on the new engine if it is required. It also concerns a case of independent major maintenance of the engine.

At removal from the engine of hinged components pay special attention to details which can be useful or important at the subsequent assembly. Remember the provision of laying, epiploons, pro-rates, pins, arms, washers, bolts and other small elements.


Left arm of fastening of the M40 engine.
  • Generator and arms
  • Components of systems of decrease in toxicity
  • Ignition distributor, high-voltage wires and spark plugs
  • Thermostat and case cover
  • Water pump
  • Components of fuel system and injection system fuel / carburetor
  • Inlet pipeline and final collector
  • Oil filter and sensor of pressure of oil
  • Arms of fastening of the engine
  • Coupling and flywheel / leader disk
  • Back cover of the engine (if it is applied)

If the small set with the block of cylinders is got, consists from collected the block, a cranked shaft, pistons and rods, also it is necessary to rearrange a head of cylinders, the pallet and the oil pump. For additional information on different possible options address to the Section Options of major maintenance of the engine.

If complete major maintenance is planned, the engine should be disassembled and internal components should be removed in the following general sequence:

  • Cover of a head of cylinders
  • Inlet pipeline and final collector
  • Covers of a belt or gazoraspredeleniye chain
  • Gazoraspredeleniye chain/belt
  • Water pump
  • Head of cylinders
  • Pallet
  • Oil pump
  • Pistons / атуны assembled
  • Cranked shaft and radical bearings
  • Camshaft
  • Shaft of yokes and yokes (engines M10, М20 and М30)
  • Pushers and hydrolifts (M40 engine)
  • Holders of springs of valves and spring
  • Valves

Before the beginning of dismantling and operations on major maintenance be convinced of availability of the following tools and accessories. Also address to the Section engine Balance of assembly at major maintenance for the list of tools and the materials necessary for assembly of the engine.

  • Manual general-purpose instruments
  • Small cardboard boxes or plastic bags for storage of parts
  • Metal box with offices for storage of hydraulic lifts (двигательМ40)
  • Scraper for laying
  • Vertical drill for facets of cylinders
  • Stripper of a vibrating damper
  • Micrometers
  • Telescopic measuring instruments
  • Tsiferblatny indicator
  • Szhimatel of springs of valves
  • Hon for surfaces of cylinders
  • The tool for pro-cleaning of flutes under piston rings
  • Electric drill
  • Set lerok and taps
  • Wire brushes
  • Brushes for oil pipelines
  • Clearing solvent

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2.2.6. Options of major maintenance of the engine
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2.2.8. Dismantling of a head of cylinders