E30 series BMW 3

since 1983-1994 of release

Repair and car operation

+ 1. Maintenance instruction
+ 2. Maintenance
- 3. Engine
   + 3.1.2. Specifications
   - 3.2. Dismantle and major maintenance of the engine
      3.2.2. Specifications
      3.2.3. Major maintenance – the general instructions
      3.2.4. Compression check in engine cylinders
      3.2.5. Major maintenance – general comments
      3.2.6. Engine diagnostics by means of the vacuum gage
      3.2.7. Major maintenance – alternatives
      3.2.8. Dismantle of the power unit
      3.2.9. Removal and engine installation
      3.2.10. Order of dismantling of the engine
      3.2.11. Dismantling of a head of the block of cylinders
      3.2.12. Cleaning and check of a head of cylinders and details of the klapanny mechanism
      3.2.13. Repair of valves
      3.2.14. Assembly of a head of the block of cylinders
      3.2.15. Removal of pistons and rods
      3.2.16. Crankshaft dismantle
      3.2.17. Intermediate shaft (only M20 engine)
      3.2.18. Cleaning of the block of cylinders
      3.2.19. Check of a condition of the block of cylinders
      3.2.20. Honningovaniye of cylinders
      3.2.21. Check of a condition of pistons and rods
      3.2.22. Check of a condition of the crankshaft
      3.2.23. Check of radical and shatunny bearings
      3.2.24. Engine assembly order
      3.2.25. Installation of piston rings
      3.2.26. Installation of an intermediate shaft
      3.2.27. Installation of the crankshaft and check of gaps in radical bearings
      3.2.28. Installation of a back epiploon
      3.2.29. Installation of rods and pistons, check of gaps in shatunny bearings
      3.2.30. Engine start-up after repair and a running in
   + 3.3. Engine electric equipment
+ 4. Cooling system
+ 5. Heating and ventilation
+ 6. Fuel system
+ 7. Exhaust system
+ 8. Transmissions
+ 9. Coupling
+ 10. Brake system
+ 11. Running gear
+ 12. Body
+ 13. Electric equipment
+ 14. Good advice


3.2.16. Crankshaft dismantle



The crankshaft can be removed only after engine dismantle from the car. Previously remove a flywheel (or a leading disk), a pulley-uspokoitel, a belt (chain), the pallet, a maslopriyemnik, the oil pump, a forward cover and rods with pistons.


1. Previously check axial люфт the crankshaft.
1. Strelochny indicator
2. Cover of the radical bearing
2. Displace the crankshaft towards a back part of the engine, having made the maximum effort, and in this situation 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 moved. If axial люфт exceeds standard value, check wear of persistent surfaces of cheeks of the crankshaft. If their wear insignificant, люфт has to 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. Carefully displace the crankshaft towards a forward part of the engine and measure axial люфт, laying щупы between a cheek of the crankshaft and an end face of the persistent radical bearing (the bearing with fillets on both parties, see subsection 3.2.27).

4. Check existence on covers of radical bearings of oriyentatsionny arrows and markings of number of the cylinder. Usually covers are numbered beginning from a forward part of the engine, oriyentatsionny shooters should be turned towards a forward part of the engine. If marking is absent, designate covers, накернив labels. Release bolts of covers on 1/4 turns at one time, until then while bolts will not begin to turn away by hand. At assembly bolts should be turned on former places.
5. Carefully displace covers in hammer blows with soft brisk and remove them together with loose leaves, without allowing their loss.

6. Carefully remove the crankshaft, considering its considerable weight. Leave loose leaves in pro-points of the block of cylinders and covers. Put covers with loose leaves on the places and tighten bolts by hand.