BMW 5 Series E39

since 1996-2001 release

Repair and operation of the car

+ Introduction
+ Maintenance instruction
+ Current leaving and service
- Engine
   - 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
+ Body
+ Onboard electric equipment
+ Schemes of electric equipment
+ System of onboard diagnostics

Processing of saddles of valves in a head cylinders / grinding in of valves

Processing of saddles of valves is required in case they have wear tracks and obgoraniye or if guides were processed. At the same time it is necessary to observe values of an adjustment corner and width of a facet. To replace saddles, using ordinary technical means it is impossible since they were installed with cooling to - 150 °C. Processing of a saddle requires the special machine. This work has to be performed in conditions HUNDRED. Values of angles of processing are given in Specifications.

Outer diameter of a saddle of the valve (4) corresponds to the outer diameter of the valve.


Grinding in of saddles

At correctly carried out processing of saddles of valves and new valves grinding in of saddles in a head of cylinders is not required.

Valves have to get used only fine-grained paste. The sucker which is put on a plate of the valve is applied to grinding in. During grinding in it is necessary to raise often the valve at the same time rotating it further. It excludes formation of furrows on the ground-in surface.

After grinding in paste needs to be removed carefully from the valve.

Quality of grinding in can be checked on appearance and fuel. For this purpose insert the valve freely into the turned head of cylinders and fill in fuel from above in the combustion chamber. After a long time (1 hour) fuel should not follow from a guide. Otherwise grinding in needs to be repeated.