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

3.2.16. Dismantle коленвала

The prevention

Коленвал it is possible to remove only after dismantle of the engine from the car. Preliminary remove a flywheel (or a leading disk), a pulley-uspokoitel, a belt (chain), the pallet, маслоприемник, the oil pump, a forward cover and rods with pistons.


1. Preliminary check up axial люфт коленвала.
1. The strelochnyj indicator
2. A cover of the radical bearing
2. Displace коленвал towards a back part of the engine, having made the maximum effort, and in this position establish an indicator scale on a zero. Then push a cranked shaft towards a forward part of the engine and consider indicator indications. The size axial люфта is equal to distance on which the shaft has moved. If axial люфт exceeds standard value check up deterioration of persistent surfaces of cheeks коленвала. If their deterioration insignificant люфт it should be corrected by replacement of radical loose leaves with the new.
3. In the absence of a display head люфт it is possible to measure by means of a set щупов. Cautiously displace коленвал towards a forward part of the engine and measure axial люфт, laying щупы between a cheek коленвала and an end face of the persistent radical bearing (the bearing with fillets on both parties, see subsection 3.2.27).

4. Check up presence on covers of radical bearings ориентационных the marksman and marks of number of the cylinder. Usually covers are numbered beginning from a forward part of the engine, ориентационные arrows should be turned towards a forward part of the engine. If marks are absent, designate covers, накернив labels. Release bolts of covers on 1/4 turns at one time, until then while bolts not begin to turn away by hand. At assemblage bolts should be turned on former places.
5. Cautiously displace covers blows of a hammer with soft brisk and remove them together with loose leaves, without supposing their loss.

6. Cautiously remove коленвал, considering its considerable weight. Leave loose leaves in проточках the block of cylinders and covers. Put covers with loose leaves on the places and tighten bolts by hand.