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
3.2.3. 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
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It is not always easy to come to a conclusion about expediency of complete major maintenance of the engine as it is necessary to be based on a number of objective indicators.
Big run is not a sufficient indicator of need of carrying out major maintenance, on the other hand, small run does not exclude need of carrying out major maintenance. The most important indicator most likely is timeliness of the current maintenance of the engine. At timely change of oil and the filter, and also at performance of all other necessary works on service, the engine serves reliably throughout many thousand kilometers of run. On the contrary, insufficient on volume or untimely maintenance can be at the bottom of sharp reduction of a resource of the engine.
The raised consumption of oil indicates wear of the piston rings, directing plugs of valves and maslosjemny caps. It is necessary to be convinced that leaks are not at the bottom of the raised consumption of oil, and only after that to draw a conclusion about unfitness of piston rings and directing plugs of valves. To define a probable cause of malfunction, measure a compression in engine cylinders.
For scoping of the forthcoming works check a compression in engine cylinders. Carry out also tests by means of the vacuum gage and define character of indications of this device. Check pressure of oil a manometer screwed to the place of the sensor of pressure of oil and compare result of check to standard value. If pressure of oil low, the reason can be wear of radical and shatunny bearings or details of the oil pump.
Capacity loss, "failures" in operation of the engine, a detonation or the metal knocks, the increased noise from the gas-distributing mechanism, indicate the increased fuel consumption need of carrying out major maintenance, especially, if all these signs of abnormal work are shown at the same time. If performance of all adjustments does not lead to improvement, the unique means of elimination of abnormal operation of the engine is major maintenance. Major maintenance consists in restoration of details of the engine to a condition specified in specifications for the new engine. At carrying out major maintenance pistons and piston rings are replaced, chiseled or хоннингуются cylinders. After repair of cylinders which is carried out in a specialized workshop, installation of repair pistons is required. Shatunnye and radical loose leaves of the crankshaft, and also a cover of basic necks of a cam-shaft also are subject to replacement, if necessary follows прошлифовать crankshaft necks before restoration of normal gaps with shatunny and radical loose leaves. As a rule, valves, as their condition at the moment of repair as a rule not the absolutely satisfactory are subject to repair also. During major maintenance of the engine repair of such units as a starter, the generator and the ignition distributor also is carried out. As a result repaired engine should possess qualities of the new unit and sustain considerable run without refusals.
Before the beginning of major maintenance of the engine familiarize with the description of the corresponding procedures that there was an impression of the forthcoming amount of works and requirements to them. At observance of all norms and rules, in the presence of all necessary tools and adaptations, it is simply to execute major maintenance, considerable expenses of time however be required. Roughly not less than two weeks, especially are required if for repair and restoration of details it is necessary to address in a specialized workshop. Check existence of spare parts and in advance take care of acquisition of necessary special tools and the equipment. Almost all works can be executed by means of a standard tool kit though exact measuring devices will be necessary for check and determination of suitability of these or those details. Often check of a condition of details carry out in specialized workshops in which also receive recommendations about replacement or restoration of these or those details.
As the condition of the block of cylinders is defining factor of decision-making on its further repair or about purchase new (or repair) the block of cylinders, to buy spare parts or to carry out operations on machining of accompanying details follows only after careful check of its technical condition. Make it a rule that the true price of repair is time, – then it is not necessary to pay for installation of the worn-out or restored details.
In summary we will note that assembly of any units should be carried out with all care in a pure room to avoid further failures of the repaired engine and to provide its reliable work.