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



3.2.7. Major maintenance – alternatives

GENERAL INFORMATION

At independent performance of major maintenance various options are possible. Defining factor is the condition of the block of cylinders which in some cases it is expedient to replace. Even at a satisfactory condition of the block of cylinders follows отхоннинговать openings under cylinders. In the spare part blocks incomplete (contains the block of cylinders with established by the krivoshipno-shatunny mechanism and pistons) and the block of cylinders of a full complete set (contains all set of the block of cylinders of an incomplete complete set, and also the oil pump, the oil pallet, a head of cylinders, klapanny and gas-distributing mechanisms, a chain or a belt with pulleys, etc.) are delivered. At an unsatisfactory condition of the krivoshipno-shatunny mechanism and the block of cylinders more expedient from the point of view of expenses is replacement of worn-out knots and details new or restored ремкомплектами which are delivered in the spare part by the manufacturer or car-care center services.

Other reasons are repair cost, possibility of access to the equipment of workshops of car-care center, existence of spare parts, time planned for work, and also personal experience.

Here some of options of performance of major maintenance.

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 wear of the block of cylinders is found, cylinders are subject to an obligatory honningovaniye.

Block of cylinders of an incomplete complete set

The block of cylinders of an incomplete complete set contains the block of cylinders with established by the krivoshipno-shatunny mechanism and piston group. All interfaced details are picked up for the dimensional groups, all gaps correspond to norms. On the block the cam-shaft, the klapanny mechanism, a head of the block of cylinders and hinged units are separately mounted not a part of it ремкомплекта. Costs of machining are minimum or are not required absolutely.

Repair engine (block of cylinders of a full complete set)

The repair engine delivered in the spare part contains all 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, the klapanny 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 laying. On a set soaking-up and final collectors and hinged units are mounted only.

Carefully think over what of alternatives to you best of all approaches, before purchase or before registration of the order for spare parts consult in a local workshop of car-care center, 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 most easier to spend this procedure during an engine partition.

Dismantle of the power unit – methods and safety measures

If the decision on engine dismantle for carrying out major maintenance, or repair of the main knots was made, it is necessary to hold certain preparatory events.

It is extremely important to plan a place in which works will be performed. Undoubtedly, the 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 beginning of dismantle will allow to keep the tool clean and a constant working condition.

Also the floor lift or a telfer will be necessary. Be convinced that these devices have a stock on loading capacity and are capable to lift the engine with transmission. Observance of security measures here plays a paramount role, as engine lifting from the car – operation potentially dangerous.

If works on dismantle of the engine are carried out by the inexperienced 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 engine dismantle 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 labor costs belong (besides the lift) a jack cart of the sufficient loading capacity, a full set of keys and opravka, wooden blocks, rags and solvent for cleaning of inevitable pools from the spilled 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 use 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 center workshop. These enterprises work according to the schedule and expedient will consult there before engine dismantle precisely to estimate costs of time of 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.