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

3.2.19. Check of a condition of the block of cylinders

Telescopic нутрометр for measurement of internal diameter

1. Check up presence on the block of cylinders of cracks and corrosion traces. Check up a condition of carvings in apertures, note places with the broken carving. If there were suspicions on leak of a cooling liquid in the block of cylinders the block should be tested for tightness for what it is expedient to address in car-care centre. At detection of defects repair the block (if it probably), or replace.
2. Check up presence having chopped off and задиров on internal surfaces of cylinders.
3. Measure internal diameter of the cylinder directly under area of a fillet in parallel and perpendicularly engine axes. Repeat measurements on the middle and in the bottom part of the cylinder. By results of these measurements define конусность and ovality of the cylinder and compare to the standard.
4. At absence нутромера the backlash can be checked special щупами, inserted in a place of the greatest friction of the piston about the cylinder (i.e. between the piston and the cylinder in one of 2 places on an axis making a corner 90 with an axis of a piston finger).
5. The backlash is defined on a thickness щупа at which the piston moves in the cylinder under moderate effort. If the piston fails or slides, above norm and the piston it is necessary to replace a backlash, and the cylinder прошлифовать. If the piston заедает at position щупа nearby НМТ also slides at position щупа nearby ВМТ конусность the cylinder exceeds norm. If at piston turn in the cylinder with laid щупом the piston заедает exceeds norm ovality of the cylinder.
6. Repeat measurements for other cylinders.
7. If backlashes, конусность and ovality exceed norm cylinders should be chiseled under the repair size and to replace pistons and rings repair.
8. If a condition of cylinders comprehensible, deterioration of the cylinder, конусность and ovality do not exceed the established norms cylinders it is required only отхоннинговать and to replace piston rings.