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

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 an obgoraniye or if the directing were processed. Thus it is necessary to observe values of an adjustment corner and width of a facet. To replace saddles, using usual means it is impossible, since they were established with cooling to - 150°С. Processing of a saddle needs the special machine. This work should be carried out in conditions HUNDRED. Values of corners of processing are given in Specifications.

External diameter of a saddle of the valve (4) corresponds to external 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 should 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 a ground-in surface.

After grinding in it is necessary to remove paste carefully from the valve.

Quality of grinding in can be checked on appearance and fuel. For this purpose the valve insert freely into the overturned head of cylinders and fill in fuel from above in the combustion chamber. After a long time (1 hour) fuel should not follow from the directing. Otherwise grinding in is necessary for repeating.