E39 series BMW 5

since 1996-2001 of release

Repair and car operation

+ Introduction
+ Maintenance instruction
+ Current leaving and service
- Engine
   - Procedures of repair of the engine
      Compression check
      Removal and installation of the bottom guard of an impellent compartment
      Removal and engine installation
      Removal and installation of the inlet pipeline
      Removal and installation of a head of cylinders
      Removal and camshaft installation
      Removal and installation of valves
      Check of directing valves
      Processing of saddles of valves in a head cylinders / grinding in of valves
      Removal, installation and tension of a maple belt
   + System of greasing of the engine
+ Systems of cooling, heating
+ Power supply system and release
+ engine Electric equipment
+ Manual transmission
+ Automatic transmission
+ Coupling and power shafts
+ Brake system
+ Suspension bracket and steering
+ Body
+ Onboard electric equipment
+ electric equipment Schemes
+ System of onboard diagnostics

Compression check

The compression provides guidance on an engine condition, namely about degree of wear of valves and pistons (piston rings). Besides, on the basis of the data received as a result of check of a compression, it is possible to judge need of replacement of the engine or its repair.

For carrying out check it is required компрессометр.

For the diesel engine it is necessary компрессометр with a big range of measurement.

The main indicator of a compression is the difference in pressure in separate cylinders. The difference of pressure in separate cylinders should be no more than 1.5 bar. If this value exceeds 1.5 bar, it indicates damages of valves, wear of piston rings or a cylinder surface. 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 from applied компрессометра. For petrol engines pressure should make not less the 10th bar, at diesel engines not less the 20th bar.

Condition of check is the charged storage battery.

For compression check the petrol engine is necessary for warming up, the diesel engine can be cold.

Petrol engine


1. Start and warm up the engine. The index of temperature of cooling liquid should show the corresponding temperature. Stop the engine, switch off ignition.
2. Remove a box of the filter of clean air on the right in an impellent compartment, looking in the movement direction that it was possible to reach electronics box.

3. Unscrew screws of fastening and uncover electronics (1) boxes. Address to an accompanying illustration.
4. Remove the main relay (1) DME (Digital electronics of the engine) that during check there was no fuel injection. (2-engine safety locks for DME). Address to an accompanying illustration.

5. Remove all spark plugs.

Establish RKPP in neutral situation and tighten the parking brake. Several times turn a starter the engine to remove from the engine a waste of products of combustion and soot.

6. Press or screw компрессометр in an opening for a spark plug according to the instruction on its operation.
7. Ask the assistant to press a pedal of gas and to hold it during check.
8. Turn the engine approximately on eight turns so that the device any more did not show pressure increase.
9. One after another check all cylinders and compare the received values to the set.
10. After completion of check screw to the place of a spark plug, address to the Section Check and replacement of spark plugs.
11. Establish the main relay, close the block of safety locks.
12. Establish a box of the air filter.

Diesel engine


1. Remove a box of the filter of clean air on the right in an impellent compartment, looking in the movement direction that it was possible to reach electronics box.

2. Unscrew screws of fastening and uncover electronics (1) boxes.

3. Disconnect the relay of preliminary heat, its working situation address to the Section Check, removal and installation of candles of an incandescence
4. Disconnect an electric cable at candles of an incandescence and turn out candles the corresponding head.
5. Screw instead of incandescence candles компрессометр.
6. Press a starter and hold it until pressure on компрессометре will not cease raise. Write down value of pressure. Remove pressure of compression one after another from all cylinders.
7. After check again screw glow plugs, having tightened them the moment of 25 Nanometers. Previously grease a carving with high-temperature CRC paste.
8. Fix the moment of 5 Nanometers cables on glow plugs.
9. Establish the relay of preliminary heat.
10. Close electronics box. Establish a box of the filter of clean air.