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
   Specifications
   Removal and installation of the top cover of the engine / lower protection of a motive compartment / stretcher
   Check of a compression in engine cylinders, identification of leaks
   Check of the engine by means of the vacuum gage
   - 4-cylinder petrol engines
      General information
      Removal and installation of a gear belt
      Removal and installation of a head of cylinders
      Removal and installation of a belt of the drive of auxiliary units
   + 6-and 8-cylinder petrol engines
   + 4-cylinder diesel engines
   + 6-cylinder diesel engines
   + engine Lubrication system
+ Cooling systems, heating and air conditioner
+ Power supply systems, release and decrease in toxicity of the fulfilled gases
+ 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





4-cylinder petrol engines

General information

1.6 l (ALZ): The engine line, with one verkhneraspolozhenny cam-shaft (OHC). The camshaft is located in a head of cylinders and is set in motion by a gear belt. The shaft affects the hydraulic pushers located vertically which in turn influence inlet and final valves.

1.8 and 2.0 l (AVJ, BFB, ALT): The engine line, with two verkhneraspolozhenny cam-shafts (DOHC), has for each cylinder three of inlet and two final valves. One camshaft sets in motion inlet valves, another final. The camshaft of final valves is set in motion from a cranked shaft through a gear belt. Camshafts of inlet and final valves are connected with each other by a chain.

2.0 l of FSI (AWA): The engine line, with two verkhneraspolozhenny cam-shafts (DOHC), has for each cylinder on two inlet and final valves.

Petrol 4-cylinder FSI engine of 2.0 l

1 — the ignition Coil
2 — the Camshaft of final valves. On the back end the camshaft inclination electric motor is located
3 — the Camshaft of inlet valves. On the forward end the Hall sensor rotor, and on the back end the pump of a high pressure for fuel injection is located. The drive is carried out from a camshaft of final valves through a chain
4 — the Lever
5 — the Injector

6 — the Gear belt
7 — the Oil pump
8 — the camshaft inclination Electric motor
9 — the Control unit of a butterfly valve
10 — the Inlet pipeline
11 — the vacuum Accumulator
12 — the Roller of switching of the inlet pipeline
13 — the Electric motor of control of the gate of the inlet pipeline
14 — the Cranked shaft

One camshaft sets in motion inlet valves, the second final valves. The camshaft of final valves (1) is set in motion from a cranked shaft (2) gear belt (3). Camshafts of inlet and final valves are connected among themselves by a chain (4). Behind on distributive to a shaft of final valves the rotary engine (5) by means of which automatically to 42 ° the corner of installation of a camshaft of final valves can be displaced is located. In back part of a camshaft of inlet valves (6) there is a pump of a high pressure of system of direct injection of gasoline. It is put in action by a double cam (7) camshafts of inlet valves.

Basic elements of a head of cylinders of AVJ, BFB, ALT 1.8 engines of l.

1 — the Cover of the bearing of a camshaft of final valves
2 — the Cover of the bearing of a camshaft of inlet valves
3 — the Gas-distributing chain
4 — the Double cover of bearings
5 — the Camshaft of inlet valves
6 — the Pusher
7 — Crackers of the cutting lock
8 — the Cogwheel of a cranked shaft
9 — the Valvate spring
10 — the Epiploon

11 — the Cap
12 — the Sensor of provision of a camshaft (CMP)
13 — the Inlet valve
14 — the Epiploon
15 — the Final valve
16 — the Head of cylinders
17 — the Segment stopper
18 — Natyazhitel of a chain
19 — the Plate of the valve
20 — the Maslootrazhatelny cap