BMW 3 Series E30

since 1983-1994 release

Repair and operation of the car

+ 1. Maintenance instruction
- 2. Maintenance
   2.2. The recommended lubricants and liquids
   2.3. Frequency of service
   2.4. Features of routine maintenance of the car
   2.5. General information on additional maintenance
   2.6. Check of level of liquids
   2.7. Check of a condition of tires and pressure in tires
   2.8. Replacement of oil in the engine and an oil filter
   2.9. Check and restoration of level of liquid in a wheel
   2.10. Check of level of liquid in automatic transmission
   2.11. Shift of wheels
   2.12. Check and replacement of hoses in a motor compartment
   2.13. Check, adjustment and replacement of belts of the drive of hinged units
   2.14. Check and adjustment of turns and quality of mix (SO) of idling
   2.15. Check of a state and battery charging
   2.16. Check and replacement of candles
   2.17. Check of high-voltage wires, runner and cover of the distributor
   2.18. Check of level of oil in the manual transmission
   2.19. Check of level of oil in the main transfer
   2.20. Check and adjustment of gaps in valves (except the M40 engine)
   2.21. Draft of a butterfly valve
   2.22. Replacement of the air filter
   2.23. Check of fuel system
   2.24. Check of the cooling system
   2.25. Check of the exhaust system
   2.26. Check of shock-absorbers, suspension bracket and steering
   2.27. Check of covers of half shafts
   2.28. Check of brakes
   2.29. Check of brushes of screen wipers
   2.30. Replacement of liquid in automatic transmission and the filter
   2.31. The cooling system – replacement of liquid and washing
   2.32. Replacement of the fuel filter
   2.33. Replacement of oil in the manual transmission
   2.34. Replacement of oil in a case of the main transfer
   2.35. Check of system of catching of vapors of gasoline (EVAP system)
   2.36. Installation of the light alarm system of need of servicing
   2.37. Replacement of a gear belt
+ 3. Engine
+ 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. Useful tips


2.12. Check and replacement of hoses in a motor compartment



Hoses of the conditioner are checked and change only in service of car service.

Under the influence of high temperatures in a motor compartment gradually there is a hardening and destruction of the rubber and plastic hoses ensuring functioning of various units of the engine. It is necessary to check periodically a condition of hoses, existence on them of cracks and hardening, weakening of connections, tightness violation.

The procedure for test of hoses of the cooling system and brakes is described in the corresponding subsections (see subsection 2.24 and subsection 10.15).

Almost all hoses fasten by means of collars. Check durability of an inhaling of collars as weakening of fastening leads to tightness violation. In those places in which collars are not provided check reliability of consolidation of a hose on unions, loss of elasticity in such connections owing to swelling or hardening of hoses is not allowed.

Vacuum hoses

Vacuum hoses (almost all treat system of decrease in toxicity) can be distinguished on color, or on the color strips pasted on them. For various systems of the engine vacuum hoses with various thickness of walls, mechanical and thermal firmness are used. When replacing track that new vacuum hoses in accuracy corresponded to replaced.

Often the hose can be checked only after removal from the car. If several hoses are removed, then previously put tags on interfaced the union and hoses subsequently not to break their relative positioning.

When checking a condition of vacuum hoses examine also plastic tees at the same time. Check existence on them of cracks, and also deformations of a hose in the place of a prileganiye to the tee union which can be a tightness cause of infringement.

For check of leaks listen through a hose piece, having put it to the checked place. Characteristic "hissing" will indicate leak existence.

Fuel hoses

At a detachment of fuel hoses keep in mind that fuel can be in them under pressure.

Check a condition of rubber fuel hoses, existence of cracks for them about bends and in places of fastenings.

When replacing hoses of the fuel highway new hoses have to correspond in accuracy to replaced.

When replacing hoses always establish collars with screw fastening.

Metal tubes

Metal tubes are usually used in the fuel highway of system of injection. Check existence on the tubes twisted pressed and cracks.

When replacing it is necessary to establish only seamless steel tubes. Tubes from copper or aluminum do not maintain vibration loadings.

Check a condition of metal tubes and unions of system of a hydraulic actuator of brakes in junctions with the main brake cylinder and the batcher (if it is provided), existence of cracks and the weakened connections is not allowed. At detection of a leak immediately carefully check all system of brakes.

Power steering hoses

At detection of dribbles of liquid replace the damaged hoses of the power steering and their collars.