BMW 3 series E30

Since 1983-1994 of release

Repair and car operation

+ 1. The maintenance instruction
+ 2. Maintenance service
- 3. The engine
   + 3.1.2. Specifications
   - 3.2. Dismantle and engine major repairs
      3.2.2. Specifications
      3.2.3. Major repairs – the general instructions
      3.2.4. Compression check in engine cylinders
      3.2.5. Major repairs – broad-brush observations
      3.2.6. Diagnostics of the engine with the help вакууметра
      3.2.7. Major repairs – alternatives
      3.2.8. Dismantle of the power unit
      3.2.9. Removal and engine installation
      3.2.10. An order of dismantling of the engine
      3.2.11. Dismantling of a head of the block of cylinders
      3.2.12. Clearing and check of a head of cylinders and details клапанного the mechanism
      3.2.13. Repair of valves
      3.2.14. Assemblage of a head of the block of cylinders
      3.2.15. Removal of pistons and rods
      3.2.16. Dismantle коленвала
      3.2.17. An intermediate shaft (only engine M20)
      3.2.18. Clearing of the block of cylinders
      3.2.19. Check of a condition of the block of cylinders
      3.2.20. Хоннингование cylinders
      3.2.21. Check of a condition of pistons and rods
      3.2.22. Condition check коленвала
      3.2.23. Check radical and шатунных bearings
      3.2.24. An engine assembly order
      3.2.25. Installation of piston rings
      3.2.26. Installation of an intermediate shaft
      3.2.27. Installation коленвала and check of backlashes in radical bearings
      3.2.28. Installation of a back epiploon
      3.2.29. Installation of rods and pistons, check of backlashes in шатунных bearings
      3.2.30. Start-up of the engine after repair and обкатка
   + 3.3. An engine electric equipment
+ 4. Cooling system
+ 5. Heating and ventilation
+ 6. Fuel system
+ 7. An exhaust system
+ 8. Transmissions
+ 9. Coupling
+ 10. Brake system
+ 11. A running gear
+ 12. A body
+ 13. An electric equipment
+ 14. A good advice

3.2.13. Repair of valves

Places of deterioration of the valve

1. An end face

2. Проточка under crackers

3. A core (a part with the least deterioration)

4. A core (a part with the greatest deterioration)

5. A facet

6. A corbel

1. Check up a valve condition (subsection 3.2.12 see). Strongly worn out valves replace.
2. If as a result of this check it will be found out that a valve condition satisfactory measure diameter of the valve in several places. Appreciable distinction of diameters specifies in deterioration of a core of the valve. At detection of appreciable distinction of diameters at least in two places the valve replace.
3. If a condition of valves satisfactory they should be ground in to saddles. If on saddles there are only insignificant damages, or the saddle was exposed to repolishing grinding in can be executed on мелкодисперсном structure. Крупнодисперсный притирочный it is necessary to apply structure only in case of detection of traces of deep development or a strong burn-out of saddles. In this case it is necessary to hand over a head of cylinders and valves on check to the skilled expert, whether it is necessary to define перезенковать saddles, or to replace loose leaves of saddles.
4. Before grinding in a head of cylinders put on an equal surface, combustion chambers upwards.
5. Put on a saddle facet a thin layer притирочной pastes. Grinding in carry out, turning the adaptation on 180 in both parties and periodically raising the valve for uniform redistribution of an abrasive material.
6. If the rough structure grinding in comes to an end after formation of a monotonous matte corbel on valve and saddle facets is applied. Wipe the valve and a saddle from the rests of paste and continue grinding in on мелкодисперсном structure. Grinding in is considered finished at formation on facets of the valve and a saddle of a uniform continuous corbel of grayish colour. The further grinding in is not supposed, as because of excessive development of a saddle its subsequent repair can become impossible.
7. After the termination of grinding in of all valves carefully wash out all details solvent.