Check of a compression. Audi A4 (from 2001 to 2005 release)
Service of Audi A4 from 2001 to 2005 release.
1. Operation and maintenance of the car
2. Engine
2.1. General information
2.2. Predvaritlny checks
2.3. Mekhanichsky part (petrol engines 2,0l)
2.4. Lubrication system
2.5. Cooling system
2.6. System of injection
2.7. System of production of the fulfilled gases
2.8. Mechanical part (petrol engines 3,0; 3,2 l)
2.8.1. Number of the engine
2.8.2. Removal and installation of a poliklinovy belt
2.8.3. Removal and installation of a damper of tortional fluctuations
2.8.4. Removal and installation of a forward sealing flange of the crankshaft with a crankshaft epiploon
2.8.5. Removal and installation of a two-mass flywheel (cars from the manual transmission)
2.8.6. Removal and a press fitting of the needle bearing of a two-mass flywheel (cars from the manual transmission)
2.8.7. Removal and installation of the conducted disk (cars with the automatic transmission)
2.8.8. Replacement of an epiploon of the crankshaft from the chain drive
2.8.9. Removal and installation of the left and right covers of driving chains
2.8.10. Removal and installation of the lower cover of a driving chain
2.8.11. Camshaft drive
2.8.12. Removal of the chain drive from cam-shafts, removal and installation of a natyazhitel of a chain
2.8.13. Removal and installation of a chain of the drive of the oil pump and balancer shaft
2.8.14. Removal and installation of the balancer shaft
2.8.15. Removal and installation of a bent shaft
2.8.16. Conrod and piston group
2.8.17. Check of a radial gap of rods
2.8.18. Check of a compression
2.8.19. Removal and installation of cam-shafts
2.8.20. Replacement of oil scraper caps
2.8.21. Check of basic elements with hydrocompensators
2.8.22. Check of the directing plugs of valves
2.9. Mechanical part (petrol engines of 4,2 l)
2.10. Mechanical part (diesel engines of 2,0 l)
2.11. Tables
3. Transmission
4. Running gear
5. Steering mechanism
6. Brake system
7. Onboard electric equipment
8. Body
9. Schemes of electric equipment
 







2-8-18-proverka-kompressii.html

2.8.18. Check of a compression

Operating procedure
Temperature of the min. engine oil is 30 °C.
Voltage of the accumulator is at least 12,5 Century.
Switch off ignition.
Remove back facing of the engine.
Remove forward facing of the engine.
Turn off a broad tank of the cooling system.
Disconnect the shtekerny socket of the switch of a signaling device of low level of cooling liquid in the bottom of a broad tank and put a broad tank with the connected hoses aside.
Disconnect the reducing valve 1 from an air hose.

Fig. 2.329. Reducing valve


Remove an air hose, for this purpose weaken a collar 2 and unblock clamps (fig. 2.329).
Unscrew bolts.

Fig. 2.2. Air duct


Remove air ducts of 1 and 2 (fig. 2.2).

Fig. 2.326. Components of system of gas distribution: 1 – Hall's sensor 2; 2 – valve 2 adjustments of phases of gas distribution; 3 – valve 2 systems of regulation of phases of gas distribution, release; 4 – Hall's sensor 4


Unscrew bolts and disconnect shtekerny sockets of coils of ignition on the left GBTs (fig. 2.326).

NOTE
Poses. 1–4 do not consider.

Unscrew bolts and disconnect shtekerny sockets of coils of ignition on the right GBTs.

NOTE
Poses. 1–5 do not consider.


Fig. 2.379. A stripper for ignition coils


Remove ignition coils by means of a stripper (fig. 2.379).
Disconnect behind on the left GBTs the shtekerny socket going to injection nozzles.

NOTE
Poses. 1 and 2 do not consider.


Fig. 2.380. Shtekerny socket of nozzles of injection


Disconnect behind on the right GBTs the shtekerny socket 1 going to nozzles of injection (fig. 2.380).
Unscrew spark plugs a candle key.
Check a compression by means of a kompressometr.

NOTE
The assistant has to squeeze out completely a pedal of an accelerator and scroll a starter until компрессометр does not cease to show growth of pressure.

Compression

Assembly is carried out in the return sequence.
Screw spark plugs.
In conclusion it is necessary to interview memory of malfunctions and, if necessary, to remove mistakes. After removal of mistakes from memory of malfunctions it is necessary to activate the Conducted Search of Malfunctions mode and to create a code of readiness (Readinesscode) in the engine control unit.

Inhaling moment
Hose collars, width are 9 mm:
3 N · m.


2.8.17. Check of a radial gap of rods

2.8.19. Removal and installation of cam-shafts