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


3.2.10. Order of dismantling of the engine


It is recommended to assort the engine at the special stand if the stand is not present, fix the engine on an equal platform.

If the restored engine is got, it is necessary to remove all hinged units, and to establish them subsequently precisely in the same order as well as at samotoyatelny major maintenance. Such units treat:

 – generator and arms;
 – details of system of decrease in toxicity;
 – distributor of ignition, candle and high-voltage wires;
 – thermostat and cover;
 – the 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 / leader hydrotransformer disk;
 – back intensifying plate.

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

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

If it is planned to carry out major maintenance with complete dismantling, 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;
 – the pump of cooling liquid;
 – head of cylinders;
 – oil pump;
 – shatunno-piston group;
 – the crankshaft with radical bearings;
 – cam-shaft;
 – rollers and yokes (except М40);
 – hydropushers and levers of pushers (М40);
 – crackers of springs of valves and spring;
 – valves.