Audi A4, S4

Since 2000 of release

Repair and car operation

Audi A4, S4
+ Introduction
+ Controls and receptions of safe operation
+ Current leaving and service
+ The engine
+ Systems of cooling, heating and the air conditioner
+ Power supply systems, release and decrease in toxicity of the fulfilled gases
+ Systems of an electric equipment of the engine
+ Manual box of a gear change
+ Automatic transmission
- Coupling, power shafts and differential
   - Coupling
      The general data
      Removal, installation and coupling check
      Removal and bearing installation
      Removal of air from hydrosystem of a drive of coupling
   + Power shafts of wheels
   + Models with a full drive of wheels
+ Brake system
+ Suspension bracket and steering
+ Body
+ Onboard electric equipment


The general data

Flywheel, basket and coupling disk

1 — the Flywheel
The adjoining surface turned towards frictional overlays, should be smooth, and not have some oil and greasing. Watch reliable position of aligning pins.
2 — the Bolt for a flywheel. Necessarily replace. Attention: Clear шлицы a primary shaft of a check point and at installation of the disk which was in work of coupling a nave. Remove a rust.
Without a two-mass flywheel: 60Нм + 90 °.
With a two-mass flywheel and length of bolts 22.5 mm: 60Нм + 90 °
At length of bolts of 43 mm: 60Нм + 180 °

3 — the Conducted disk of coupling
Adjusting position: a dempfirujushchy package (springs) should be turned towards a press disk. Frictional overlays of a conducted disk should adjoin to a flywheel, an inscription «the check point party» if it is available, is turned to a press disk.
4 — Press a disk. Observe installation position
5 — the Bolt 25Нм. Turn on and turn in stages
А/В Color points. If are available, the white point () should be from outside a two-mass flywheel, and a white point () - a press disk

On considered models one-disk dry coupling with диафрагменной a spring is established.

Coupling consists of a basket with the press disk, a conducted disk, the bearing of deenergizing of coupling and a hydraulic drive.

The coupling basket is connected by bolts to a flywheel which is in turn fixed on cranked to an engine shaft. Between a press disk and a flywheel there is a conducted disk of coupling which nestles on a flywheel a press disk. The conducted disk of coupling is connected through шлицевое connection with primary shaft of a transmission.

By pressing of a pedal of coupling by means of a hydrodrive the bearing of deenergizing of coupling presses a spring of a press disk. Press the disk and a conducted disk thus unloads does not nestle any more on a flywheel. Power communication between the engine and transmission interrupts.

Coupling of all models with РКПП has a hydraulic drive. A working liquid is the brake liquid which arrives from the general tank of a brake liquid.

At each inclusion and deenergizing of coupling owing to a friction there is a deterioration of frictional overlays of a conducted disk. The conducted disk is a wearing out element of coupling. Its average service life makes over 100 000 km. Speed of deterioration depends on loading (movement with the trailer) and a management style the car. Coupling does not demand service, since. It self-established.

The majority of engines is equipped by a two-mass flywheel. Such flywheel has pruzhinno-dempfirujushchuju the system, allowing to extinguish крутильные the fluctuations arising at work of the engine. Besides, the noise level on low turns thus decreases. The coupling disk at such flywheel consists of a nave, a conducted payment and frictional overlays. Dempfirujushchie springs are not established.