VW Passat repair


+ 1. Ekspluatatsiiya of the car
+ 2. Maintenance
+ 3. Engines
+ 4. Cooling system
+ 5. Power supply system
+ 6. Ignition system
+ 7. Coupling
- 8. Transmission
   + 8.1. Mechanical transmission
   + 8.2. Automatic transmission
   - 8.3. Distinctive features of transmission of cars with a full drive of Passat Syncro
      8.3.1. Specifications and characteristics
      8.3.2. General information
      8.3.3. Transmission knots
      8.3.4. Check of operability of the obgonny coupling
+ 9. Drive of forward wheels
+ 10. Suspension brackets
+ 11. Steering
+ 12. Brake system
+ 13. Wheels and tires
+ 14. Systems of heating, ventilation and conditioning
+ 15. Electric equipment
+ 16. Body
+ 17. Electric circuits


Repair B3-B4/Passat B3-B4 Volkswagen Passat>> Transmission>> Distinctive features of transmission of cars with a full drive of Passat Syncro>> General information

Fig. 8.81. Passat SYNCRO car transmission: 1–differential of a forward axis; 2–driveshaft; 3–вискомуфта; 4–differential of a back axis


At all-wheel drive models the torque from the engine is transferred to all wheels. As a result of operation of the automatic blocking device of intermediate differential there is an optimum distribution of engine capacity corresponding to a way of driving of the car and road conditions. In this regard all-wheel drive cars equally well behave at movement on highways and highways both in normal conditions, and in adverse, and also in cross-country conditions. The torque from the engine is transferred through a transmission and intermediate differential to differential of a forward axis, and from it — via the driveshaft — on differential of a back axis. At movement on a dry covering the torque is evenly distributed on all wheels of a lobby and a back axis. If wheels on one of axes lose coupling with the road and will appear on the verge of a proskalzyvaniye or pro-slipping, intermediate differential, without reducing torque size, automatically blocks wheels of this axis, transferring big size of a torque to the wheels of other axis having normal coupling with the road. Distribution of a torque to wheels at all-wheel drive models non-uniform also depends on extent of coupling of lobbies or back wheels with the road. The differential 4 (fig. 8.81) of the main reverse gear has the coupling of a free wheeling which disconnects a drive of back wheels when braking by the engine.

Reasons of the main malfunctions and ways of their elimination