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
3.2.3. 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
3.2.7. Major repairs – alternatives
At independent performance of major repairs various variants are possible. The defining factor is the condition of the block of cylinders with which in some cases it is expedient to replace. Even at a satisfactory condition of the block of cylinders follows отхоннинговать apertures under cylinders. In spare parts blocks incomplete (contains the block of cylinders with established krivoshipno-shatunnym the mechanism and pistons) and the block of cylinders of a full complete set (contains all complete set of the block of cylinders of an incomplete complete set, and also the oil pump, the oil pallet, a head of cylinders, клапанный and газораспределительный mechanisms, a chain or a belt with pulleys, etc.) are delivered. At an unsatisfactory condition krivoshipno-shatunnogo the mechanism and the block of cylinders more expedient from the point of view of expenses is replacement of the worn out knots and details new or restored ремкомплектами which are delivered in spare parts by the manufacturer or car-care centre services.
Other reasons are repair cost, access possibility to the equipment of workshops of car-care centre, presence of spare parts, time planned for work, and also personal experience.
Here some of variants of performance of major repairs.
Acquisition of separate spare parts
If check shows that the block of cylinders and the majority of details are in a satisfactory condition and can be used further the most expedient from the economic point of view is purchase of separate spare parts. The block of cylinders, shatunno-piston group and a cranked shaft should be surveyed especially carefully. Even if insignificant deterioration of the block of cylinders is found out, cylinders are subject obligatory хоннингованию.
The block of cylinders of an incomplete complete set
The block of cylinders of an incomplete complete set contains the block of cylinders with established krivoshipno-shatunnym the mechanism and piston group. All interfaced details are picked up for the dimensional groups, all backlashes correspond to norms. On the block the mechanism, a head of the block of cylinders and hinged units are separately mounted not a part of it ремкомплекта a cam-shaft, клапанный. Expenses for machining are minimum or are not required absolutely.
The repair engine (the block of cylinders of a full complete set)
The repair engine delivered in spare parts contains all complete set of the block of cylinders of an incomplete complete set, and also the oil pump, the oil pallet, a head of the block of cylinders, a cover of a head of the block of cylinders, a cam-shaft, клапанный the mechanism, gear wheels of a drive of a cam-shaft, a gear belt and belt covers. All details are established with new bearings, consolidations and linings. On the complete set soaking up both final collectors and hinged units are mounted only.
Carefully think over what of alternatives to you is better approaches, before purchase or before registration of the order for spare parts consult in a local workshop of car-care centre, with suppliers of spare parts, and also with experts in restoration of engines.
Auxiliary elements of the engine – removal
(Inlet and final collectors, coupling, spark plugs, the distributor of ignition and the oil filter) it is possible to remove auxiliary elements of the engine separately from the established engine, but it is the most easier to carry out this procedure during an engine partition.
Dismantle of the power unit – methods and safety precautions
If the decision on dismantle of the engine for major repairs carrying out, or repair of the basic knots it is necessary to spend certain preparatory measures was accepted.
It is the extremely important to plan a place in which works will be made. Undoubtedly, best place is the workshop. It is very important to have the equipped working platform, and also a place for car storage. If neither a workshop, nor the garage is not present, the equal and pure concrete or asphalted platform is required at least.
Washing of a motor compartment and the power unit before the dismantle beginning will allow to keep the tool clean and a constant working condition.
Also will be necessary the floor lift or тельфер. Be convinced that these devices have a stock on load-carrying capacity and are capable to lift the engine with transmission. Observance of security measures here plays a paramount role, as lifting of the engine from the car – operation potentially dangerous.
If works on engine dismantle are spent by not skilled person the assistant is necessary. Consult and ask to help the persons having experience in such works. There is a set of examples of that as attempts alone to execute dismantle of the engine with lifting of last of a motor compartment came to an end unsuccessfully.
In advance plan the actions. Before beginning works hire or get all necessary tools and the equipment. To some adaptations providing safety at dismantle and installation of the engine, and also decrease in expenditures of labour concern (besides the lift) a jack-cart of the sufficient load-carrying capacity, a full set of keys and оправок, wooden колодки, rags and solvent for cleaning of inevitable pools from the spilt working liquids of the engine. If the lift is hired, about it agree in advance, having performed all works in which this mechanism is not required. It will allow to save money and time.
Keep in mind that considerable time you cannot take advantage of the car. For performance of some works inaccessible in house conditions in the absence of the special equipment, it is necessary to address in a car-care centre workshop. These enterprises work under the schedule and expedient will consult there before engine dismantle precisely to estimate expenses of time for repair and restoration of details.
Always at dismantle and installation of the power unit be very attentive. Rash actions can cause serious traumas. In advance consider the actions. Do not feel sorry on it for time, for the main thing – work without traumas.