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


3.2.30. Launch of the engine after repair and a running in

1. After the end of assembly check the level of oil and cooling liquid twice.
2. By the turned-out candlelight and the disconnected system of ignition turn the crankshaft until registration of pressure of oil the sensor.
3. Screw candles, dress tips of high-voltage wires and connect system of ignition.
4. Start the engine. The engine has to be started immediately, later the short period necessary for increase of pressure of fuel.


If at the first launch of the engine through a butterfly valve backfires are observed, then check installation of ignition and correctness of assembly of the gas-distributing mechanism.

5. Warm up the engine, watching closely emergence of leaks of oil or cooling liquid.
6. Stop the engine and check levels of oil and cooling liquid.
7. Accelerate the car from the speed of 50 km/h to 90 km/h, release a pedal of a butterfly valve, having slowed down the car the engine to the speed of 50 km/h. Repeat the cycle of 10-12 times. At the same time occurs extra earnings of piston rings to walls of cylinders. Double-check levels of oil and liquid.
8. Make a trip on 800 km, without subjecting the engine to big loadings (move at a low speed, periodically checking oil level). In the period of a running in the raised oil consumption is possible.
9. After the run of 900-1100 km replace oil and an oil filter.
10. At a run of the subsequent several hundred kilometers conduct the car in the normal mode, avoiding too big and too small loadings.

11. Later 3300 km of a run replace again oil and an oil filter then the engine is considered passed a running in.