Audi:: A4 B6:: 4-cylinder petrol engines

4.5. 4-cylinder petrol engines

1.6 l (ALZ): The engine is 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 is 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 bent 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 is line, with two verkhneraspolozhenny cam-shafts (DOHC), has two inlet and final valves for each cylinder.

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 rotor of the sensor of Hall, and on the back end the pump of high pressure for fuel injection is located. The drive is carried out from the 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 Bent shaft

One camshaft sets in motion inlet valves, the second final valves. The camshaft of final valves (1) is set in motion from a bent shaft (2) by a 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 angle of installation of the camshaft of final valves can be displaced is located. In a back part of the camshaft of inlet valves (6) there is a pump of high pressure of system of direct injection of gasoline. It is put in action by a double cam (7) of the camshaft 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 the camshaft of final valves
2 — the Cover of the bearing of the 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 bent shaft
9 — the Valvate spring
10 — the Epiploon

11 — the Cap
12 — the Sensor of position of the 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


1 — the Cover of the bearing of the camshaft of final valves 2 — the Cover of the bearing of the 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 bent shaft 9 — the Valvate spring 10 — the Epiploon	11 — the Cap 12 — the Sensor of position of the 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