Audi A4

since 1994 of release

Repair and car operation



A4 Audi
+ Running gear
+ Regular servicing
- Engines
   Capacity steps
   Engine signs
   Technology of the engine, maintenance and repair
   Greasing system
   Exhaust ventilation of a case
   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 fuel pump
+ Air filter and absorption channels
+ injection System
+ Coupling
+ Transmission and main transfer
+ Suspension bracket of wheels and steering
+ Brakes
+ Wheels and tires
+ Electrotechnical equipment
+ ignition System
+ Lighting
+ Alarm equipment
+ Tools and devices
+ Heating and ventilation
+ body Details
+ Salon
Search of malfunctions
Technical characteristics





The help at malfunctions

The crankshaft of the six-cylinder engine is turned for the central bolt of a belt pulley of the crankshaft. As the tool it is necessary to use a superimposed natural an internal dvenadtsatigrannik of SW 24 with a graggers or the lever.


The top dead point (VMT) is found, if the mark "About" on a flywheel appears under a base edge on the case of a transmission (shooter).


Other marking of VMT is in the six-cylinder engine on a belt pulley or on the bottom cover of a gear belt (arrow).


At position of the cylinder No. 1 in VMT big openings of fixing plates on both flywheels of cam-shafts are turned to the center of the engine (shooter).


Engine facing with working volume of 1,8 l fastens on the right two clips (1 and 2). At the left facing in two places (3 and 4) is put on two fixing fingers


Facing of a poliklinovy belt of the six-cylinder engine is put on below two fingers (1 and 2), above it in two places (3 and 4) is screwed.

At the left: shooters showed four high-speed locks which facings at removal of the six-cylinder engine should be turned to the left on 90 °.

On the right: in the six-cylinder engine the cover of a gear belt fastens two clips (arrow). To dismantle the right cover of a gear belt, it is necessary to remove in addition a tension roller of a poliklinovy belt (a big bolt with an internal shestigrannik).


Shooters showed fixing bolts on a cover of a head of the block of cylinders of the engine with working volume of 1,6 l. Bolts become available after dismantle of facing of the engine.


Here the cover of a head of the block of cylinders of the engine with working volume of 1,8 l is dismantled. Shooters noted the provision of fixing bolts.

Too low indicators of pressure

Indicators of equally low pressure of compression yet reason for concern; the admissions of measurements different for different devices can be the reason of low indicators. But if at measurements on different cylinders the difference makes more the 3rd bar, it is necessary to reflect. It can mean the following:

  • wear of pistons and piston rings;
  • piston rings densely sitting in flutes as a result of pollution;
  • cylinders of not round form as a result of jamming of pistons;
  • deposits on cores of valves or saddles of valves at the expense of burning and greasing products;
  • the burned-down valves. In most cases the reason of insufficient pressure of compression are not tight valves and, therefore, the lowered engine capacity. Repair of a head of the block of cylinders can help only.

Search of malfunctions

For defect localization at too low pressure of compression use reception: a manual butterdish drip a little engine oil in a nest of a spark plug and once again measure pressure of compression.

  • If indicators and are lower now norms, valves not as it should be.
  • If indicators became higher, matter in piston rings and, maybe, in cylinders. The filled-in oil for a while worked as laying between the piston and cylinder walls so the compressed gas almost did not find an exit.

The test for pressure loss (on tightness)

The test for tightness which some workshops can carry out gives more exact results. If the checked chamber of combustion loses pressure, it is shown on a tester scale.

It is possible to determine larger place of leak by listening:

  • Hissing in an exhaust pipe testifies to leaky being closed final valve.
  • The air effluence from the case of the air filter testifies to defect of the inlet valve.
  • At defective laying of a head of the block of cylinders or a crack in a head of the block of cylinders the compressed air arrives through the next nest of a spark plug or from an open broad tank with cooling liquid outside.
  • Worn-out walls of the cylinders, directing pistons or piston rings pass pressure in a case, and it leaves an open maslozalivny branch pipe or from a tube for щупа measurements of level of oil.

Engine scrolling

 PERFORMANCE ORDER

  1. For this purpose put the car with a mechanical transmission on the fourth transfer on an equal surface.
  2. In the four-cylinder engine establish the bent superimposed key of SW-24 on the central nut of a belt pulley of the generator and now turn the engine by means of a klinovo-ridge belt.
  3. In the six-cylinder engine dismantle the bottom facing of an impellent compartment (head of the Detail of a body), establish on the central bolt of a belt pulley of the crankshaft a superimposed key of SW 24 and turn it by means of a graggers or the lever.
  4. Never rotate the engine for a fixing bolt of a pulley of a gear belt of a cam-shaft at the removed cover of a gear belt! The gear belt can jump thus – danger of damage of the engine.

Cylinder No. 1 installation in the top dead point of the moment of ignition

In the four-cycle engine the piston during four working steps two times reach the top dead point (VMT): once at ignition of the let-in mix, in the second time – after emission of exhaust gases, with an admission of a fuel and air mix beginning right after it. Usually at various adjusting works the position of VMT of the cylinder No. 1 is required.

 PERFORMANCE ORDER

  1. Four-cylinder engine: dismantle a cover of a gear belt (it is described in this chapter above). Turn the crankshaft so that marking on a pulley of a gear belt of a cam-shaft rose opposite to the corresponding mark in a cover of a head of the block of cylinders or in a back cover of a gear belt.
  2. For best accuracy move the crankshaft a little backwards-forward so that in a viewing opening at the left in a bell of a transmission it (is remote) marking "About" on a flywheel rose opposite to edge of a viewing opening.
  3. Six-cylinder engine: dismantle on the right and at the left a cover of a gear belt (it is described in head further).
  4. Rotate the crankshaft until big openings on fixing plates of both pulleys of cam-shafts will not rise on inside against each other.
  5. If it is necessary, whether move a few crankshaft there-here or turn it to itself so that in a viewing opening of a bell of a transmission marking "About" on a flywheel rose opposite to edge of a viewing opening.

Dismantle of facing of the engine

 PERFORMANCE ORDER

  1. The four-cylinder engine with working volume of 1,6 l: a big screw-driver turn to the left on 90 ° two high-speed locks. Take out from hooks and remove facing.
  2. The four-cylinder engine with working volume of 1,8 l: weaken two fixing clips on the right on facing. Take out facing from the left hook and remove.
  3. Lift up facing for back edge over valves of injection and extend ahead from shtekerny connection.
  4. Six-cylinder engine: a big screw-driver turn to the left on 90 ° four high-speed locks.
  5. Remove facing.

Dismantle of facing of a klinovo-ridge belt

6-cylinder engine

The belt in the six-cylinder engine works as Poliklinova under facing at the face-to-face party of the engine.

 PERFORMANCE ORDER

  1. Dismantle engine facing.
  2. Weaken fastening of two bolts with internal shestigrannik near a package of coils of ignition.
  3. Remove facing up from both fixing bolts.
  4. At installation facing in the beginning put on fixing fingers.

Dismantle of a cover of a head of the block of cylinders

 PERFORMANCE ORDER

  1. The engine with working volume of 1,6 l: remove a lock collar, remove a ventilating hose of a case.
  2. Dismantle engine facing how it is described above.
  3. If it is necessary, take out from clips a cable plait.
  4. Weaken fixing nuts.
  5. Remove strengthening levels (together with arms of a wire of a high voltage).
  6. Remove a back cover of a gear belt.
  7. Lift a cover.
  8. If it is necessary, remove a maslootrazhatel.
  9. The four-cylinder engine with working volume of 1,8 l: dismantle engine facing how it is described.
  10. Dismantle ignition coils (head ignition System).
  11. Weaken nine fixing bolts of a cover of a head of the block of cylinders.
  12. Lift a cover.
  13. If it is necessary, remove a maslootrazhatel.
  14. Six-cylinder engine: dismantle engine facing.
  15. Weaken fixing bolts.
  16. Lift a cover.
  17. If it is necessary, remove a maslootrazhatel.
  18. At installation, whenever possible, use new laying.
  19. The four-cylinder engine with working volume of 1,6 l: do not forget strengthening level of a guard under fixing nuts.
  20. The four-cylinder engine with working volume of 1,8 l: check accuracy of landing of laying, two-piece.
  21. Six-cylinder engine: slightly grease the internal and external parties of laying of a cover of a head of the block of cylinders with silicone greasing D 007 000 04 (from spare parts).
  22. Put on all four edges between a sealing surface of a head of the block of cylinders and a cover of the bearing of a cam-shaft of a few Silimate AMV 174 004 01 from a warehouse of the spare parts Audi. Track that the opening for greasing under a cover of the bearing of a cam-shaft thus did not get littered.
  23. For all models: since the cover middle, tighten cross-wise nuts and bolts with the moment of an inhaling of 10 Nanometers.