BMW 3 Series E30

since 1983-1994 release

Repair and operation of the car

+ 1. Maintenance instruction
+ 2. Maintenance
+ 3. Engine
+ 4. Cooling system
+ 5. Heating and ventilation
+ 6. Fuel system
- 7. Exhaust system
   + 7.1.2. Exhaust system of cars 318i
   + 7.2. System of decrease in toxicity of exhaust gases
+ 8. Transmissions
+ 9. Coupling
+ 10. Brake system
+ 11. Running gear
+ 12. Body
+ 13. Electric equipment
+ 14. Useful tips

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7. Exhaust system

7.1. Exhaust system

7.1.1. Introduction


The exhaust system of the considered cars consists of a final collector, catalytic converter, mufflers, connecting pipes and details of their suspension bracket (arms, collars, pillows).

Standard fastening of pipes of the exhaust system

The exhaust system fastens to a body through arms and rubber pillows. At failure of any of system details operation of the engine is followed by the increased noise.

For maintenance of the exhaust system in good repair periodically check a condition of details. Check existence of the dispersed seams, traces of a burn-out and decumulation by corrosion, and also other defects which are the reason of hit of exhaust gases in salon. The failed details are not subject to repair.

If details of system do not give in to removal because of a holding strap owing to corrosion, then they should be removed with cutting. Usually this procedure is performed in workshops by means of autogenous cutting. However, at desire to save on the cost of these works and in the absence of own gas-welding equipment, cutting can be executed a hacksaw.

At repair of the exhaust system follow the following rules:

1. Remove details of the exhaust system one after another, since terminal section and finishing forward section.

2. To facilitate an otvorachivaniye of nuts and bolts grease them with the getting liquid.

3. When replacing pipes and mufflers surely replace details of their suspension bracket.

4. At assembly grease all carvings with the fixing structure.

5. Between the bottom of a body and exhaust pipes there has to be a gap to prevent an overheat of the bottom and destruction of an anticorrosive covering and rug. Pay special attention at assembly to installation of converter and a heat-insulating guard.

Gap between a terminal exhaust pipe and a body


Collar on an arm of a back suspension bracket

For adjustment of a gap between a terminal exhaust pipe and a body release a bolt (shooter) and move the muffler.

On a part of cars adjustment of a terminal exhaust pipe concerning a body is provided.