Audi A4

Since 1994 of release

Repair and car operation

Audi А4
+ Running gear
+ Regular servicing
- Engines
   Capacity steps
   Engine signs
   Technology of the engine, maintenance service and repair
   Greasing system
   Exhaust ventilation картера
   The visual control of the engine
   Engine service life
   Nominal and maximum frequency of turns
   Restriction of number of turns
   Measurement of pressure of compression
   The help at malfunctions
   Hydropushers
   Works on a gear belt
   The help at malfunction
   Installation and dismantle of a head of the block of cylinders
   Installation and engine dismantle
+ Turbo-supercharging
+ Exhaust system
+ Cooling system
+ Fuel tank and the fuel pump
+ The air filter and channels всасывания
+ Injection system
+ Coupling
+ Transmission and the main transfer
+ Suspension bracket of wheels and steering
+ Brakes
+ Wheels and tyres
+ The electrotechnical equipment
+ Ignition system
+ Illumination
+ The alarm equipment
+ Tools and devices
+ Heating and ventilation
+ Body details
+ Salon
Search of malfunctions
Technical characteristics

Measurement of pressure of compression

For measurement it is necessary to warm up the engine. Tightness of piston rings increases, when oil is hot. Besides, it is necessary to stop fuel giving in cylinders. Otherwise at measurement of pressure the engine will be filled in by fuel that can damage каталитический the converter. And, at last, it is necessary to switch off ignition, without the connected candles the ignition coil can be damaged at engine start.

At the left: measurement of pressure of compression by the inexpensive measuring device for fans.

On the right: that at measurement of pressure of compression fuel was not injected in cylinders, on all valves of injection (arrow) sockets act in film.

PERFORMANCE ORDER

Switch off ignition and stop fuel giving. In different models it becomes differently:
Four-cylinder the engine with working volume 1,6 l: disconnect a socket of a terminal exit of capacity of the coil of ignition.
Disconnect sockets of all four valves of injection.
The four-cylinder engine with working volume 1,8 l: ignition coils are dismantled in any case (the head ignition System), sockets on coils of ignition or a terminal exit are thus disconnected also. Disconnect sockets of all four valves of injection.
The six-cylinder engine: disconnect both sockets on a final exit of capacity of coils of ignition (the head ignition System). Disconnect sockets of all six valves of injection.
For all models: unscrew all spark plugs.
Press a rubber cone of a manometre to an aperture of a candle of the first cylinder (the sequence has no value, but write down) or screw in a connecting tube in a spark plug carving.
Include a manual brake, the gear change lever put in neutral position or the lever-selector of an automatic transmission in position Р.
Let your assistant a starter will turn the engine. The gas pedal should be completely wrung out thus (for the purpose of the best filling of the cylinder).
When the pressure indicator already essentially does not rise, write down it and spend measurements on the following cylinder.

Pressure indicators

Here indicators of pressure according to Audi are resulted:

The engine	14-cylinder		16-cylinder
Engine letter designation	ADP/ADR	AEB	ABC/AAH
Pressure of compression nominal size, a bar	9–14	10–13	9–14
The minimum size, bar	7,5	7,0	7,5
The maximum distinction in pressure, a bar	3,0	3,0	3,0