4d3121b2

E30 series BMW 3

since 1983-1994 of release

Repair and car operation



E30 BMW
+ 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



3.2.2. Specifications

GENERAL INFORMATION

All sizes are specified in mm.

Pressure of a compression in cylinders  10-11 kgfs/cm2
Maximum permissible deformation of the demountable plane of a head of cylinders 0,1 (except М40, for М40 – no more than 0,03)
Limiting height of a head of cylinders after polishing, not less, than a mm:
  – М10 128,6
  – М20
124,7
  – М40
140,55
Valves
Diameter of a core of the valve (standard):
  – М10
8,0
  – М20
7,0
  – М40  
     • Inlet
6,975
     • Final
6,960
Width of a corbel, limiting
  – Inlet
1,191
  – Final
1,980
Lateral люфт a valve core (see subsection 3.2.13) 0,787
Corner of a facet of a head of the valve
45 °
Cam-shaft and yokes of valves:
  – A gap in basic necks  0,033-0,076
  – Axial люфт:
     • М10
 0,02-0,13
     • М20 no more than 0,2
     • М40  0,065-0,150
  – A gap between the roller and a yoke ("a radial gap")  0,015-0,051
Crankshaft
Axial люфт:
  – М10
 0,085-0,174
  – М20 and М40
 0,080-0,163
Diameter of radical necks (standard):
  – М10
     • red marking  54,98-54,99
     • dark blue marking
54,97-54,98
  – М20
     • red marking  54,98-54,99
     • dark blue marking
 59,97-59,98
  – М40
     • yellow marking
 59,984-59,990
     • green marking
 59,977-59,983
     • white marking
 59,971-59,976
Repair sizes of necks
0,25; 0,50; 0,75
Gap in radical bearings:
  – М10 and М20
 0,030-0,070
  – М40
 0,020-0,46
Diameter of shatunny necks (standard):
  – М10 and М20
 47,975-47,991
  – М40
 44,975-44,991
Diameters of shatunny necks (repair) 0,25; 0,50; 0,75 (on a part of engines)
Rods
Axial люфт
0,041
Gap in shatunny bearings:
  – М10
 0,030-0,070
  – М20
 0,020-0,055
  – М40  0,010-0,052
Block of cylinders
Diameter of cylinders (standard):
  – М10/В18
 89,00-89,01
  – М20/В20  80,00-80,01
  – М20/В25
 84,00-84,01
  – М40/В16
 84,000-84,014
  – М40/В18  84,000-84,014
Ovality of cylinders, no more:
  – М20/В20
0,02
  – М20/В25 0,03
  – The others
0,01
Konusnost of cylinders, no more:
  – М20/В20 and М20/В25 0,02
  – the others
0,01
Pistons and rings
Diameter of the piston (standard):
  – М10
88,97
  – М20:
     • В20
79,98
     • В25 83,98
  – М40:
     • factory brand 0 83,985
     • factory brand 00 84,065
Gap between the piston and the cylinder:
  – М10  0,02-0,05
  – М20 and М40  0,01-0,04
The limiting:
  – except В25
0,15
  – В25 0,12
Gaps in joints of piston rings:
  – М10  
     • in the top kompressionny  0,30-0,70
     • in the bottom kompressionny  0,20-0,40
     • in the maslosjemny  0,25-0,50
  – М20 (all rings)  0,25-0,50
  – М40:
     • in the top kompressionny
 0,02-0,20
     • in the bottom kompressionny
 0,02-0,10
     • in the maslosjemny:
  – for В16
 0,02-0,10

Inhaling moments (N of m)

Bolts of covers of radical bearings (change at major maintenance):
  – М10 and М20 60
  – М40
     • 1st stage
20
     • 2nd stage
to tighten on 50 °
Bolts / nut of shatunny covers:
  – М10
55
  – М20 and М40
     • 1st stage 20
     • 2nd stage to tighten on 70 °
Covers of basic necks of a cam-shaft (М40)
10
Bolt of an asterisk of an intermediate shaft (М20) 60
Oil pipeline bolts:
  – bolt М6 or М8 (cap union) 10
  – bolt М5
5