Audi A4, S4

since 2000 release

Repair and operation of the car



Audi A4, S4
+ Introduction
+ Governing bodies and methods of safe operation
+ Current leaving and service
+ Engine
+ Cooling systems, heating and air conditioner
- Power supply systems, release and decrease in toxicity of the fulfilled gases
   + Power supply systems of petrol and diesel engines
   + System of injection of fuel of the petrol engine
   + System of injection of fuel of the diesel engine
   - Systems of release and decrease in toxicity of the fulfilled gases. Turbocompressor
      Removal and installation of system of release. Replacement of the central, additional muffler, trailer pipe
      Correction of laying of system of release / trailer pipe
      Systems of decrease in toxicity of release - the general information
      Catalytic converter
      Removal and installation of the catalytic converter and lambda probes
      Turbocompressor - the general information and precautionary measures
      Interkuler - the general information
+ Systems of electric equipment of the engine
+ Manual box of gear shifting
+ Automatic transmission
+ Coupling, power shafts and differential
+ Brake system
+ Suspension bracket and steering
+ Body
+ Onboard electric equipment






Systems of release and decrease in toxicity of the fulfilled gases. Turbocompressor

Removal and installation of system of release. Replacement of the central, additional muffler, trailer pipe

The system of production of the fulfilled gases of the petrol engine consists of a final collector, a reception pipe, the catalytic converter (pour), the central muffler, a connecting pipe, the additional muffler and a trailer pipe (trailer pipes).

Petrol engine of 2.0 l

System of production of the fulfilled gases. Engine of 2.0 l of ALT

1 — the Preliminary muffler. In initial execution together with the additional muffler. In case of repair it can separately be replaced
2 — the Bolt *, 25nm. Surely replace
3/4 — the Suspension bracket
5 — the Bolt, 25nm
6 — the Nut *, 30nm
7 — Sealing laying *
8 — the Final collector
9 — the Catalytic converter. Do not drop
10 — Dokatalitichesky a lambda probe 1, 55nm
11 — Post-catalytic a lambda probe 2, 55nm
Instruction: Grease with high-temperature A3 G 052 112 paste only a carving of both sensors. Paste should not get on a sensor case groove.
12 — Sealing laying *

13 — the Reception pipe of system of release with a connecting element. An element do not incline on a corner more than 10 °
14 — the Suspension bracket
15 — the Terminal plug
16 — the Nut, 40nm
17 — the Collar, 25nm
18 — the Tip
19 — the Suspension bracket
20 — the Nut, 25nm
21 — the Additional muffler. In initial execution together with the preliminary muffler. In case of repair it can separately be replaced
22 — the Terminal plug
23 — the Nut, 40nm
24 — the Bolt, 25nm
25 — the Suspension bracket
*) Surely replace.

Elements of system of release can be replaced separately. In the initial equipment preliminary and additional mufflers represent uniform knot. The central and additional mufflers at repair can be disconnected from each other, and are on sale separately as spare parts.

Lifting operation and installations of the car on supports is connected with danger! Therefore before carrying out operation study Poddomkrachivaniye's Section and towage.

 PERFORMANCE ORDER

  1. Lift and install the car on supports, remove the lower cover of the engine, address to the Section Removal and installation of the top cover of the engine / the lower protection of a motive compartment / stretcher.
  2. Spray all bolts and nuts of system of release by means for dissolution of a rust and wait some time.
  3. Turn out bolts on a connecting flange the catalytic converter / reception a pipe.

If the system of release has to be removed together with the catalytic converter, turn out fastening bolts on a flange a final collector / the catalytic converter and remove a lambda probes, address to the Section Removal and installation of the catalytic converter and a lambda probes.

  1. Disconnect a forward cross-piece of fastening of system of release.

Do not bend a flexible connecting element in a reception treba more than on 10 °, otherwise it can be damaged. By means of the assistant disconnect and remove system of release from collars.

Diesel engine of 2.5 l

Removal of preliminary and additional mufflers

System of production of the fulfilled gases. Diesel engine of 2.5 l

1 — the Bolt, 23nm
2 — the Suspension bracket. At installation of the shooter has to show in the direction of the movement of the car
3 — the Central muffler. In the initial equipment of the car knot together with the additional muffler. In case of repair it can separately be replaced
4 — the Preliminary pipe of the muffler with two catalytic converters, with a connecting element. Do not bend an element on a corner more than 10 °
5 — Sealing laying *
6 — the Preliminary catalytic converter
7 — the Nut, 25nm
8 — the Turbocompressor
9 — the Nut, 25nm
10 — the Terminal plug forward
11 — the Nut, 40nm

12 — the Additional muffler. In initial execution together with the central muffler. In case of repair it can separately be replaced
13 — the Suspension bracket
14 — the Bolt, 23nm
15 — the Additional muffler. In initial execution together with the central muffler. In case of repair it can separately be replaced
16 — the Nut, 23nm
17 — the Nut, 40nm
18 — the Terminal plug back. Before fixing expose system of release so that it reached the position. Bolted connections have to be turned to the right
*) surely replace.

If preliminary and additional mufflers were not replaced yet, for separate replacement it is necessary to cut them in certain points. The place of division is noted by small hollows on a muffler pipe.

 PERFORMANCE ORDER

  1. Cut off a pipe a hacksaw on tags. Lateral tags show, the terminal plug can be how far shifted.
  1. Disconnect the muffler from rubber holders and take out.

Installation of system of release

Sealing laying, nuts and bolts have to be replaced surely. For simplification of later dismantling of system of release Liqui Moly LM-508-ASC is recommended to grease bolts and nuts of fastening with high-temperature paste, for example.

Do not bend a flexible connecting element of a reception pipe more than on 10 °, otherwise it can be damaged.

 PERFORMANCE ORDER

  1. Install system of release by means of the assistant in rubber holders.
  2. Fix a forward cross-piece the moment 25nm on the car bottom.
  3. Fix system of release at a flange with a new sealing ring, new bolts and nuts. Observe the tightening moments.
  4. If acted a lambda probes, establish them, address to the Section Removal and installation of the catalytic converter and a lambda probes.

Installation of preliminary and additional mufflers

If preliminary or additional mufflers were only removed, fix mufflers new collars.

 PERFORMANCE ORDER

  1. Arrange the terminal plug (1) on the middle of a cut. The terminal plug (1) has to settle down horizontally, bolts have to show to the left.
  1. Install the terminal plug so that the end of a bolt did not support its lower edge.
  1. Evenly tighten bolts the moment 40nm.
  2. Expose system of release so that it settled down freely, without tension and deformations.
  3. Establish into place the lower cover of the engine.

Replacement of a trailer pipe

 PERFORMANCE ORDER

  1. Cut off a hacksaw a trailer pipe (1) in a division place (C).
  1. Shift a trailer pipe (3) to a tag (And). Thus combine a cut on a trailer pipe with a tag (In). Tighten a collar (2) moment 25nm.
  2. Expose a trailer pipe.

Check of system of release on tightness

At cars with the adjustable catalytic converter leakage of system of release can result in difficulties in start of the engine. The engine stops, shivers during the work on single turns, twitches at increase in number of turns.

 PERFORMANCE ORDER

  1. Start the engine and at the working engine close system of release by a rag.
  2. Listen to system of release. If necessary, spray places of connections a head of cylinders / a final collector and a final collector / reception a pipe means for search of leaks. Check, whether there are no bubbles.
  3. Eliminate leakage.











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