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)