BMW 3 series E30

Since 1983-1994 of release

Repair and car operation

+ 1. The maintenance instruction
+ 2. Maintenance service
- 3. The engine
   + 3.1.2. Specifications
   - 3.2. Dismantle and engine major repairs
      3.2.2. Specifications
      3.2.3. Major repairs – the general instructions
      3.2.4. Compression check in engine cylinders
      3.2.5. Major repairs – broad-brush observations
      3.2.6. Diagnostics of the engine with the help вакууметра
      3.2.7. Major repairs – alternatives
      3.2.8. Dismantle of the power unit
      3.2.9. Removal and engine installation
      3.2.10. An order of dismantling of the engine
      3.2.11. Dismantling of a head of the block of cylinders
      3.2.12. Clearing and check of a head of cylinders and details клапанного the mechanism
      3.2.13. Repair of valves
      3.2.14. Assemblage of a head of the block of cylinders
      3.2.15. Removal of pistons and rods
      3.2.16. Dismantle коленвала
      3.2.17. An intermediate shaft (only engine M20)
      3.2.18. Clearing of the block of cylinders
      3.2.19. Check of a condition of the block of cylinders
      3.2.20. Хоннингование cylinders
      3.2.21. Check of a condition of pistons and rods
      3.2.22. Condition check коленвала
      3.2.23. Check radical and шатунных bearings
      3.2.24. An engine assembly order
      3.2.25. Installation of piston rings
      3.2.26. Installation of an intermediate shaft
      3.2.27. Installation коленвала and check of backlashes in radical bearings
      3.2.28. Installation of a back epiploon
      3.2.29. Installation of rods and pistons, check of backlashes in шатунных bearings
      3.2.30. Start-up of the engine after repair and обкатка
   + 3.3. An engine electric equipment
+ 4. Cooling system
+ 5. Heating and ventilation
+ 6. Fuel system
+ 7. An exhaust system
+ 8. Transmissions
+ 9. Coupling
+ 10. Brake system
+ 11. A running gear
+ 12. A body
+ 13. An electric equipment
+ 14. A good advice

3.2.15. Removal of pistons and rods

The prevention

For removal of pistons and rods it is necessary to remove a head of cylinders and the pallet. On engines M10 and М20 it is necessary to remove also the oil pump (subsection 3.1.15 see).


1. If in the top part of cylinders the fillet (it is checked наощупь) it should be removed development was formed, otherwise at piston removal it is possible to break rings.
2. Turn the engine коленвалом upwards.
3. Check up axial люфт rods, inserting щупы between a cheek коленвала and a rod. Axial люфт it will be equal to a total thickness щупов at which люфт disappears. If axial люфт a rod exceeds standard value it is necessary to replace rods. If new rods are established (or коленвал) axial люфт can be less norms (in this case it is necessary прошлифовать rods, if necessary consult in a car-care centre workshop). Repeat procedure for other rods.
4. In the absence of labels on rods and covers of rods накерните on them number of the corresponding cylinder.
5. Ослабьте an inhaling of nuts шатунных covers, turning on them on 1/2 turns at one time, until then while nuts not begin to turn away by hand. Uncover a rod of the first cylinder together with the loose leaf, the loose leaf from a cover do not take.

6. Push out the piston with a rod and the loose leaf through the top part of the cylinder, preliminary having dressed on hairpins (if are available) hose pieces. If resistance to piston moving check up cleanliness of removal of a fillet is felt.
7. Turning коленвал, get rods with pistons from other cylinders.
8. Collect rods with covers and bearings, tighten nuts of covers by hand. The piston from a rod yet do not remove.