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REPAIR MAINTENANCE OPERATION OF MOTOR VEHICLES
Audi A6 (1997 release)

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Audi A6
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Audi
A6
General Information
Operation of the vehicle
Maintenance
Engines
Four-cylinder petrol engines
Six-cylinder petrol engines
Diesel engines 1.9 l
Diesel engines 2.5 l
Overview
Control parameters of the engine parts
Tightening torques of the main threaded connections
Removing and installing engine
Ribbed Belts
Toothed belt
The oil pan, front and rear engine cover
Crankshaft
Intake manifold
Cylinder heads
Gas distribution
Ignition, fuel injection and exhaust of gasoline engines
The power supply system, and preheating the exhaust gases of diesel engines
Lubrication System
Cooling system
Coupling
Transmission
The front wheel drive shafts
Design features four-wheel drive transmission
Suspension
Wheels and tires
Steering
Brakes
Body
Heating and air conditioning
Electrical
Electric schemes
 


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Removing and installing engine



Recommendations about engine removal
Before proceeding, please read this section.
If the engine is removed for repair, you must choose a place for work, provide space for maintenance and storage of spare parts. Repair is recommended at the service station or in a garage with a flat, level floor and a clean hard surface.
Before removal, clean from dirt and clean the engine and engine compartment. When lifting, use hoist with sufficient capacity to safely lift the engine.
If you remove the engine for the first time, invite an experienced specialist. Some of the work should be performed with an assistant.
All clips and clamps that when removing the engine will be damaged or cut, the assembly of the engine replaced.
Engine extracted forward separately from the gearbox.
Drain coolant must be collected and disposed of.
Before disconnecting the battery, check whether you have the code switch on the radio.

Withdrawal
Switch off the ignition and disconnect a wire of "weight" from the storage battery.

Location screws engine cover
Fig. 3.4.1. Location screws engine cover


Remove the screws and remove the engine cover (Fig. 3.4.1).

Location screws bottom mudguard of a motor compartment
Fig. 3.4.2. Location screws bottom mudguard of a motor compartment


Remove the screws and remove the two sections of the bottom mudguard of the engine compartment (Fig. 3.4.2).
Remove the front bumper.

Location of the air nozzle (1) and the air filter cover (2)
Fig. 3.4.3. Location of the air nozzle (1) and the air filter cover (2)


Remove the air tube 1 (Fig. 3.4.3) and the air filter cover 2.
Disconnect the air tube from the air cooler.
On the left front side of the engine compartment, remove the screw fastening the bracket supporting the air-conditioning duct system.
Disconnect the air pipe cooler air from the suction pipe.
Install the front transverse panel in service position.

Unscrewing bolts radiator fan with viscous coupling
Fig. 3.4.15. Unscrewing bolts radiator fan with viscous coupling


Remove the bolt radiator fan with viscous coupling, keeping the axis of rotation of the fan the other wrench (see. Fig. 3.4.15).
Remove the cover of the expansion tank.
Disconnect an electric socket of the electromagnetic clutch of the compressor air conditioning, located near the surge tank, and take him aside.
Remove the left and right casings of a gear belt.
Disconnect an electric socket of the gauge charge air and move it to the side.

Location housing screws V-ribbed belt
Fig. 3.4.16. Location housing screws V-ribbed belt


Remove the screws and remove the cover V-belt (see. Fig. 3.4.16).

Location bolts thermofilter of turbocharger
Fig. 3.4.4. Location bolts thermofilter of turbocharger


Remove the bolts (Fig. 3.4.4) and remove thermofilter on turbocharger.

Location bolts reception exhaust pipe to the turbocharger.
Fig. 3.4.5. Location bolts reception exhaust pipe to the turbocharger.


Remove the bolts a reception exhaust pipe to the turbocharger (Fig. 3.4.5).
Loosen the hose clamps and remove the front exhaust pipe with catalytic converter.
Disconnect the compensator reactive torque from the front of the engine.
Remove the cap from the V-ribbed belt tensioner compressor.

Location bolts tensioner V-ribbed belt air conditioning compressor
Fig. 3.4.17. Location bolts tensioner V-ribbed belt air conditioning compressor


Loosen the bolt and remove the clip from the belt pulleys (see. Fig. 3.4.17).

A WARNING
Chalk, markers or paint mark the direction of rotation of poly V-belt. After setting the belt rotates in the opposite direction, which may result in its destruction.

Remove the bolts and the air conditioning compressor without disconnecting from it hoses, take the compressor aside and secure the wire to the front suspension. Do not hang the hoses on the compressor!

The weakening of the tension of the main V-ribbed belt tensioner and lock pin (1)
Fig. 3.4.18. The weakening of the tension of the main V-ribbed belt tensioner and lock pin (1)


Allen wrench, turn counterclockwise the main tensioner V-ribbed belt to loosen the tension. Lock the tensioner in this position pin 1 (see. Fig. 3.4.18) and remove the belt.

Location pulley bolt WTP V-ribbed belt and pulley device to keep from turning
Fig. 3.4.6. Location pulley bolt WTP V-ribbed belt and pulley device to keep from turning


Hold the V-belt pulley of power steering pump special tool, remove the pulley bolt (Fig. 3.4.6).
Remove the bracket located under the power steering pump.
Remove the screws power steering pump to the bracket and, without disconnecting from it hoses, take the pump aside.

Place the air hose connection (1) and the electrical connector (2) to the top section of the air filter
Fig. 3.4.7. Place the air hose connection (1) and the electrical connector (2) to the top section of the air filter


Disconnect air hose 1 (Fig. 3.4.7) of the air filter.
Unplug electrical connector 2 and remove the top section of the air filter inlet pipe.
Remove the generator.
Disconnect the wires from the starter, remove the screws and remove the starter.

Location of the spring retainer (1) the sensor and the drain plug (2)
Fig. 3.4.8. Location of the spring retainer (1) the sensor and the drain plug (2)


Remove the spring clamp 1 (Fig. 3.4.8) and remove the gauge from the cooling hoses.
Remove the drain plug 2 (Fig. 3.4.8).

Place a hose attachment (1) to the oil cooler and the location of the hoses (2 and 3) cooling system
Fig. 3.4.9. Place a hose attachment (1) to the oil cooler and the location of the hoses (2 and 3) cooling system


On the left side of the engine, disconnect the hose 1 (Fig. 3.4.9) of the oil cooler.
Disconnect the coolant hoses 2 and 3 (Fig. 3.4.9).
Loosen the hose clamps and disconnect the hoses from the surge tank.
Remove the screws, disconnect the coolant level sensor, and remove the expansion tank.
Disconnect an electric socket of the gauge needle lift and move it aside.
Disconnect the hose with check valve on the vacuum pump.
Disconnect pipelines of giving and return of fuel from the fuel pump and move them aside.
Disconnect vacuum hose pressure control valve and move it aside.
Loosen the clamps and disconnect coolant hoses going to a heater.

Location of electrical connectors
Fig. 3.4.10. Location of electrical connectors: 1-3 - the electrical connectors; 4 - a socket of the fuel pump; 5 - connector coolant temperature sensor


Disconnect the electrical connectors 1-3 (Fig. 3.4.10) and move them aside.
Disconnect the electrical connector 4 (see. Fig. 3.4.10) from the fuel pump and move it to the side.
Disconnect the electrical connector 5 from the coolant temperature sensor and move it to the side.
Disconnect the electrical connectors from the glow and move them aside.

Location nuts engine mounts (A)
Fig. 3.4.11. Location nuts engine mounts (A)


Remove the nuts left and right engine mounts A (Fig. 3.4.11).
Remove the rack from the hood bonnet support. Install the hood vertically and secure it in this position.
Remove the upper bolts transmission to the engine, leaving a top bolt in place.
Hang on a hoist lifting gear in 2024 and secure the clamps on the engine.
Unscrew remaining bolt transmission to the engine.
Check that all electrical wires, hoses, tubes and pipes were disconnected from the engine.
Carefully lift the engine, then release it from the gearbox and pull up from the engine compartment.

Setting
Installation is spent to sequences, return to removal, taking into account the following.

Location and numbering bolts manual gearbox to the engine
Fig. 3.4.12. Location and numbering bolts manual gearbox to the engine: A - installation location centering sleeve


When installing the motor must be replaced all the self-locking nuts and bolts (Fig. 3.4.12), which delayed dovorachivaniem at a certain angle, as well as seals and gaskets.
Before installing the motor secure the sides of the engine compartment, electric wires and hoses to prevent damage to their engines.

Pos.
Bolt
Tightening torque Nm
1
M12x80
65
2
M12x90
65
3
M10x50
45
4
M10x45
45
5
M10x135
65
6
M12h110
65
7
M12x67
65

When installing, check for centering sleeves A, determining the relative position of the engine and gearbox.
Clean input shaft splines. When reusing the clutch disc to remove a corroded. Lubricate the splines of the shaft with a thin layer of greasing G 000 100.
Check the condition of the clutch release bearing and replace it if necessary.
Using a mandrel, align the clutch disc.
Check the condition of the needle bearing in the end of the crankshaft on the flywheel side. If necessary, replace the bearing.
Mount the motor in place and, shaking it from side to side, ensure the correct location on the supports.
Before wrapping the air conditioning compressor mounting bolts, make sure that the dowel sleeves compressor are in place.
Check the fluid level in the hydraulic power steering.
Check that the exhaust system components are correctly installed on the suspension and do not touch the body when it is swinging.
Fill the cooling system with coolant. In case the cylinder head was removed and replaced with the cylinder block coolant reuse is allowed.
Set the compensator reactive torque and screw it to the engine and the body, tightening the bolts to 45 Nm.
Install poly V-belt air conditioning compressor and adjust its tension.

Adjusting the tension of the V-ribbed belt air conditioning compressor
Fig. 3.4.20. Adjusting the tension of the V-ribbed belt air conditioning compressor: 1 - bolt tensioner V-ribbed belt; 2 - ribbed belt air conditioning compressor; 3 - Torque Wrench


Torque wrench with hexagon head 6 mm Turn tensioner pulley V-belt air conditioning compressor counterclockwise until 7 Nm. Hold the torque wrench in this position, a second wrench to tighten a bolt of 1 fastening of a roller-ribbed belt 25 N ?� m (see. Fig. 3.4.20).
Before first starting the engine bleed the fuel system, since otherwise it will damage the fuel pump.
Before starting the engine, check the availability and level of oil in the engine.
Check the connection of the electrical connectors.
Attach the wire of "weight" to the battery.
Turn on the radio and enter the code.
Lift up the power window glass until it stops. Then press all the switches window again, at least 1, in the closed position of the control unit to activate windows.
Set the clock.




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Tightening torques of the main threaded connections
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Ribbed Belts

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