BMW 3 Series E30

since 1983-1994 release

Repair and operation of the car

+ 1. Maintenance instruction
+ 2. Maintenance
- 3. Engine
   + 3.1.2. Specifications
   - 3.2. Dismantle and capital repairs of the engine
      3.2.2. Specifications
      3.2.3. Capital repairs – the general instructions
      3.2.4. Check of a compression in engine cylinders
      3.2.5. Capital repairs – general comments
      3.2.6. Diagnostics of the engine by means of the vacuum gage
      3.2.7. Capital repairs – alternatives
      3.2.8. Dismantle of the power unit
      3.2.9. Removal and installation of the engine
      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 valvate 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. Dismantle of the crankshaft
      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 conrod 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 conrod bearings
      3.2.30. Launch of the engine 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. Useful tips


3.2.16. Dismantle of the crankshaft



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


1. Previously check an axial side play of the crankshaft.
1. Arrow 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 zero. Then push a bent shaft towards a forward part of the engine and consider indications of the indicator. The size of an axial side play is equal to distance to which the shaft moved. If the axial side play exceeds standard value, then check wear of persistent surfaces of cheeks of the crankshaft. If their wear insignificant, then a side play has to be corrected by replacement of radical inserts with new.
3. In the absence of an indicator head the side play can be measured by means of a set of probes. Carefully displace the crankshaft towards a forward part of the engine and measure an axial side play, laying probes between a cheek of the crankshaft and an end face of the persistent radical bearing (bearing with fillets on both parties, see subsection 3.2.27).

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

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