BMW 5 Series E39
since 1996-2001 release
Repair and operation of the car
+ Maintenance instruction
+ Current leaving and service
- Procedures of repair of the engine
Check of a compression
Removal and installation of the lower guard of a motive compartment
Removal and installation of the engine
Removal and installation of the inlet pipeline
Removal and installation of a head of cylinders
Removal and installation of the camshaft
Removal and installation of valves
Check of the directing valves
Processing of saddles of valves in a head cylinders / grinding in of valves
Removal, installation and tension of a maple belt
+ Engine lubrication system
+ Cooling systems, heating
+ Power supply system and release
+ Engine electric equipment
+ Manual transmission
+ Automatic transmission
+ Coupling and power shafts
+ Brake system
+ Suspension bracket and steering
+ Onboard electric equipment
+ Schemes of electric equipment
+ System of onboard diagnostics
Check of a compression
The compression gives an idea of a condition of the engine, namely of degree of wear of valves and pistons (piston rings). Besides, on the basis of the data obtained as a result of check of a compression it is possible to judge need of replacement of the engine or its repair.
For conducting check it is required компрессометр.
The main indicator of a compression is the difference in pressure in separate cylinders. The difference of pressure in separate cylinders has to be no more than 1.5 bars. If this value exceeds 1.5 bars, then it indicates damages of valves, wear of piston rings or the surface of the cylinder. At achievement of a limit of wear the engine is subject to repair or replacement.
At petrol engines it is necessary to turn out spark plugs. It is recommended to combine it with planned replacement of candles. At diesel engines for check of a compression glow plugs are turned out.
Value of pressure of compression is of secondary importance since it depends among other things on the applied kompressometr. For petrol engines pressure has to make not less than 10 bars, at diesel engines not less than 20 bars.
Condition of check is the charged rechargeable battery.
For check of a compression the petrol engine needs to be warmed up, the diesel engine can be cold.