E46 series BMW 3

since 1998 of release

Repair and car operation

E46 series BMW 3
+ BMW 3 Cars (E46)
+ Current leaving and service
- Engine
   - Procedures of repair of the engine
      Removal and installation of the bottom cover of an impellent compartment
      Removal and installation of a box of an air inlet
      Compression check
      Removal and installation of the inlet pipeline
      Removal and head installation cylinders / replacement of sealing laying
      Removal and installation of camshafts
      Removal and installation of the vacuum pump
      Removal, installation and tension of a maple belt
   + System of greasing of the engine
+ Systems of cooling, heating
+ Power supply systems, injection and release
+ engine Electric equipment
+ RKPP and transmission line
+ Automatic transmission
+ Coupling and power shafts
+ Brake system
+ Suspension bracket and steering
+ Body
+ Onboard electric equipment
+ electric equipment Schemes


Compression check

Check of a compression allows to draw a conclusion on an engine condition. During check it is possible to establish, whether valves and pistons (piston rings) are serviceable or they are worn-out. Besides, results of check show, whether it is necessary to replace the engine or it is necessary for repairing. For check it is necessary компрессометр.

For check of a compression of the diesel engine it is necessary special компрессометр which is rolled in a carving opening of candles of an incandescence. Check of a compression of the diesel engine here is not described.

The difference between values of pressure of a compression of separate cylinders should not exceed 1.0 bar at the petrol engine, and 3.0 bar at a diesel engine.

If one or several cylinders in comparison with others have the pressure differing on higher value, it indicates damage of valves, wear of piston rings or damage of laying of a head of cylinders. In this case it is necessary to repair or replace the engine.

The size of pressure is of secondary importance, as it depends among other on the applied measuring device. Petrol engines should not have it less the 10th bar.


1 Condition of check is the charged storage battery.
2 Switch off ignition.
3 Rasstykuytes the main relay of an electronic control system of the engine to exclude fuel injection during check. The arrangement of the relay of a control system is shown in Specifications of Head Onboard electric equipment.

If the relay of a control system is not disconnected by the engine, the target step of the main relay of a control system can be damaged.

4 Remove all spark plugs, address to the Section Check of levels of liquids.

5 Models 316i, 318i: Rasstykuyte the multipolar socket of coils of ignition for what turn to the left the handle-1-.

6 Establish manual a check point in neutral situation, automatic in the situation "R". Tighten the parking brake.

Be not declined over the engine if it is turned at the removed spark plugs. There is a danger of a travmirovaniye owing to particles of soot thrown out thus!

7 Insert or screw компрессометр in a spark plug opening according to the maintenance instruction.
8 Ask the assistant to press completely a pedal of gas and to hold her in such situation during the whole time of check.
9 Turn the engine approximately on 8 turns so that pressure growth on компрессометре stopped.
10 Thus, consistently check all cylinders.
11 If the compression in one or several cylinders lies below a wear limit, pour in a little impellent oil through an opening of a spark plug and again measure pressure the kompressometry. If after that pressure increases, it indicates wear of piston rings and/or a working surface of the cylinder. If pressure does not raise, the valve or sealing laying of a head of cylinders is, as a rule, damaged
12 Establish spark plugs, address to the Section Check of levels of liquids.
13 Models 316i, 318i: Join the multipolar I will corrode ignition coils, thus turn the handle to the right.
14 Establish the main relay of a control system of the engine, address to Specifications of Head Onboard electric equipment.