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


3.2.29. Installation of rods and pistons, check of gaps in shatunny bearings


Before installation of pistons assembled with rods the surface of the cylinder should be absolutely pure, the facet should be removed from edges of cylinders, and the crankshaft is established in the block of cylinders.

1. Disassemble a rod of the 1st cylinder. Wipe a back surface of the new top shatunny loose leaf and lay it in a place in a rod. Be convinced that the ledge on the loose leaf came into sample in a rod and lubricant openings coincided. The loose leaf not to grease. Similarly establish in a rod cover the bottom loose leaf.
2. Place joints of piston rings so that they settled down at an angle 120 °.
3. Put on hoses bolts of rods. Grease pistons and rings with pure oil for the engine, compress rings the adaptation, having left an acting site of the piston the 6-7th.
4. Turn the crankshaft to NMT in the first cylinder, oil cylinder walls for the engine.
5. Soriyentiruyte the piston so that dredging was turned towards a forward part of the engine.
6. Carefully enter the lower part of the piston with a rod into the first cylinder against the stop adaptations in the block of cylinders. Slightly knock on the upper edge of an opravka for uniform contact to the plane of the block of cylinders.

7. Enter the piston into the cylinder, carefully tapping with the wooden handle of a hammer on the piston bottom. Big effort not to apply. If resistance is felt, immediately stop sideways and eliminate the jamming reason.

8. Draw a rod to a neck of the crankshaft and check a gap in a rod the bearing.
9. Procedure of check differs nothing from procedure for radical bearings (see subsection 3.2.23). Rotation of the crankshaft or the slightest hit of oil on loose leaves at measurements are not allowed. Nuts of a cover of a rod tighten with the set moment (see subsection 3.2.2) a face head with thin walls (to exclude head jamming between a nut and a rod cover, on engines M10 and М20 tighten nuts in 3 stages). If the gap does not correspond to norm, be convinced of lack of greasing and dirt and again check diameter of a neck and correctness of selection of the shatunny loose leaf.

Final assembly of rods

1. Carefully remove the calibre remains, grease loose leaves and a shatunny neck of the crankshaft, establish a cover and evenly tighten nuts with the set moment.
2. Repeat measurement and assembly procedure for other rods. Check freedom of rotation of the assembled crankshaft.
3. Check axial люфт a rod (see subsection 3.2.15). Keep in mind that after installation of new rods люфт there can be less norm and polishing of rods is required.
4. Collect and establish the engine.