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


3.2.10. Order of dismantling of the engine


It is recommended to disassemble the engine at the special stand if there is no stand, then fix the engine on the flat platform.

If the restored engine is bought, then it is necessary to remove all hinged units and to install them subsequently just in the same order as well as at samotoyatelny capital repairs. Treat such units:

 – generator and arms;
 – details of system of decrease in toxicity;
 – distributor of ignition, candle and high-voltage wires;
 – thermostat and cover;
 – pump of cooling liquid;
 – details of system of injection of fuel or carburetor;
 – collectors;
 – oil filter and sensor of pressure of oil;
 – engine mount arms;
 – flywheel/drive plate of the hydrotransformer;
 – back intensifying plate.

Before removal of hinged units apply tags on laying, epiploons and other details to facilitate assembly.

If the block of cylinders of an incomplete complete set is installed, then it is also necessary to remove a head of the block of cylinders, oil pallet and the oil pump.

If it is planned to make capital repairs with full dismantling, then the engine should be disassembled completely in the following order:

 – cover of a head of cylinders;
 – soaking-up and final collectors;
 – forward covers;
 – chains and asterisks;
 – pump of cooling liquid;
 – head of cylinders;
 – oil pump;
 – conrod and piston group;
 – crankshaft with radical bearings;
 – cam-shaft;
 – rollers and yokes (except M40);
 – hydropushers and levers of pushers (M40);
 – crackers of springs of valves and spring;
 – valves.