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

3.2.11. Dismantling of a head of the block of cylinders
1. Remove a head of cylinders (subsection 3.1.13 see).
2. Remove маслопровод. Consolidations under heads of bolts of fastening маслопровода are subject to replacement.
Engines M10 and М20
3. Rotating clowns коромысла, establish in valves limiting backlashes.
4. Check up axial люфт a cam-shaft on the indicator, having displaced a cam-shaft in both parties against the stop and having defined a difference of indications.
5. Remove from a cam-shaft a persistent plate which is or in a forward part of a head of cylinders behind a gear wheel flange (М10), or near to platens коромысел in a head, in its forward part (М20 and М40).
6. Remove a back cover of a head of cylinders.
7. Get from коромысел lock rings (the ring of wire type is shown).
8. Check up a backlash between platens and коромыслами. For this purpose shake коромысло here and there, without supposing sliding along the platen, and define on the indicator total люфт which compare with specified in subsection 3.2.2. If the backlash exceeds norm the worn out details replace.
9. On a part of engines get rubber заглушки (or turn out if заглушки carving) from a forward part of a head of cylinders. Заглушки are available in a forward part of each platen коромысел.

The prevention

If in platens are available вваренные заглушки they should be removed in car-care centre.

10. Turn a cam-shaft until then yet ослабнет pressure of springs on большей parts коромысел.
11. On those коромыслах on which effort of a spring not ослабло, a special plug, or screw-drivers, wring out коромысла коромысла from cams of a cam-shaft and keep in such position at cam-shaft removal. Screw-drivers insert on everyone коромысле into backlashes over clowns from outside valves. As a rule, it is necessary to keep 3–4 коромысла, the assistant therefore is required.
12. After коромысла any more do not rest against cam-shaft cams cautiously get a cam-shaft through a forward part of a head of cylinders. If necessary turn a cam-shaft in process of its removal. Do not damage a surface of beds under basic necks of a cam-shaft.
13. Cautiously get platens коромысел. If in the platen there is a carving it can be got from outside a forward part of a head a shock stripper. On engines without carving apertures in platens beat out platens blows from outside a back part of a head under the wooden prorate in diameter a bit smaller apertures in коромысле.
14. Get коромысла.
15. Designate everyone коромысло and the platen that at assemblage to establish on former places. At removal of platens remember their orientation. Small lubricant apertures and dredging of a directing lath should be turned inside, the big apertures should be turned downwards, towards directing plugs of valves.
Engine M40

The prevention

On this engine it is forbidden to overturn a head.

16. Check up presence of numbering and ориентационных labels on covers of basic necks of a cam-shaft.
17. Gradually and in regular intervals turn away bolts of basic covers and a cam-shaft. Remove covers.
18. Get a cam-shaft and a back epiploon.
19. Prepare cash desks for hydropushers and levers of pushers.
20. Get levers of hydropushers.
21. Get persistent disks.
22. Get hydropushers.
All engines
23. Prepare bags. Store details of equipment of each valve together in one bag that at assemblage to establish on former places.

24. Compress a spring of the first valve by means of the adaptation and remove crackers. Cautiously release a valve spring, remove a spring plate, a spring and a basic washer.
25. Get the valve from a head of cylinders.
26. Repeat the same actions for other valves.
27. Clear a head of cylinders (if the engine understands completely the head should be cleared on termination of dismantling).