Audi A3

Since 1997 of release

Repair and car operation



Audi A3
+ The maintenance instruction
+ Current leaving and service
- The engine
   Compression check in engine cylinders
   Check of the engine by means of the vacuum gauge
   Removal and installation of the bottom cover of an impellent compartment
   Removal and engine/rkpp installation
   + Four-cylinder petrol engines 1.6, 1.8 l
   + Diesel engines
   + Major repairs
   + Greasing system
+ Systems of cooling, heating
+ The power supply system and release of the fulfilled gases
+ Engine electric equipment
+ Manual box of a gear change
+ Automatic transmission and models with a full drive
+ Coupling and power shafts
+ Brake system
+ Suspension bracket and steering
+ Body
+ Onboard electric equipment
+ Electroschemes


https://www.youtube.com/channel/UCoah5uA-uF-j35-MalVTfRQ


The engine

THE GENERAL DATA

ATTENTION

Separate characteristics are resulted also in the text of the Head and in case of compulsion of their performance are allocated by a bold type.



Engine designation//Type//the release Beginning
The engine 1.6
AEH//OHC//7/96 –
The engine 1.8
AGN//DOHC//6/96 –
The engine 1.8T
AGU//DOHC//12/96 – 8/98
The engine 1.8 Т
AQA, AJQ, APY//DOHC//9/98 –
The engine 1.9 TDI
AGR, ALH//OHC//6/96 –
The engine 1.9 TDI
AHF//OHC//1/98 –
The engine 1.9 TDI
ASZ//OHC//5/00 –
Working volume of cylinders, sm3
The engine 1.6
1595
Engines 1.8
1781
Engines 1.9 TDI
1896
Capacity, kw (h.p.) at rpm//the Twisting moment, Hм at rpm
Engines AEH,
74 (101)/5600//145/3800
Engine AGN
92 (125)/6000//173/4100
Engine AGU, AQA
110 (150)/5700//210/1750
Engine AJQ
132 (180)/5500//235/1950
Engine APY
154 (210)/5800//270/2100
Engine TDI AGR, ALH
66 (90)/4000//210/1900
Engine TDI AHF
81 (110)/4150//235/1900
Engine TDI (ASZ)
96 (130)/4000//310/1900
Compression degree
Engines 1.6
10.2
The engine 1.8
10.3
The engine 1.8
10.3
Engines 1.9 TDI
19.5
Pressure of a compression, bar
Petrol engines standard value (new)
1.6, 1.8T
10–13
1.8
9–14
Deterioration border
1.6, 1.8
7.5
1.8Т
7.0
Diesel engines
Standard value (new)
1.9 TDI
25–31
Deterioration border
1.9 TDI
19
Arrangement/number of cylinders//Number of valves on the cylinder
Engines 1.6, 1.9
rjadnoe/4//2
Engines 1.8
rjadnoe/4//5
Operating procedure of cylinders
1–3–4–2
Diameter of cylinders, mm
The nominal
Engines 1.6, 1.8
81.010
Engines 1.9
79.5
1st repair
+0.250
2nd repair
+0.500
Course of pistons, mm
Engines
1.6 77.4
Engines
1.8 86.4
Engines
1.9 95.5
Pistons
Backlash in the cylinder
0.03
Deterioration limit
0.06
Piston rings
Backlash in a flute, mm
Компрессионное
0.02–0.07
Маслосъемное
0.02–0.06
Deterioration limit
0.12
Backlash in the deterioration lock/limit, mm
Компрессионное
0.15–0.40/0.8
Маслосъемное
0.25–0.50/1.0
Three-componental маслосъемное to
1.0/1.3
Admissible minimum height of a head of cylinders
Engines of 1.6 l
132.60 mm
Engines of 1.8 l
139.25 mm
Cranked shaft
Radical bearings
Deterioration backlash/border, mm
0.02–0.06/0.17
The maximum ovality, mm
0.03
Shatunnye bearings
Deterioration backlash/border, mm
0.01–0.06/0.12
Axial люфт kolenvala/deterioration border, mm
0.07–0.17/0.25
Klapannye backlashes
Are not exposed since hydropushers are applied
Greasing system
Compulsory circulating system with шестеренчатым the oil pump
Pressure in system, a bar on idling
1.0 (2.0 – 1.6)
On 2000 rpm
3.0 – 4.5 (2.0 diesel engine)
Pressure of fire of a control lamp, more low
1.2 – 1.6 (2.0 diesel engine)
Impellent oil
AUDI 500 00, AUDI 501 01, AUDI 502 00 AUDI 503 00
Quantity of oil with filter replacement
All engines
4.5 l
Difference between marks “max” and “min” on a measuring core
1 litre
Cooling system
Circulating, with the water pump, the thermostat, the fan and a plastinchato-tubular radiator
Volume of a cooling liquid
1.6, 1.8
5.0 l
The air filter
Dry, with a paper element
Control system of the engine
AEH
Simos 2
AGN
Motronic M3.8.5
AGU
Motronic M3.8.3
AQA, AJQ
Motronic ME7.5
APY
Motronic
Fuel
неэтилированное, is not worse PETROL 95 (probably application PETROL 91 with insignificant decrease in capacity)
Efforts of a tightening of carving connections
The moments of an inhaling of fixture are resulted also in the text and on some иллюстрациях*.

*Выделенные in the text a bold type the inhaling moments are subject to exact observance; the efforts not allocated with a bold type are resulted only roughly
Bolts of a head of the block of cylinders
Engines of 1.8 l
AGN
1st reception
40 Hм
2nd reception
60 Hм
3rd reception
90
4th reception
90
Engines AEH, AGU, APY
1st reception
40 Hм
2nd reception
90
3rd reception
90
Diesel engines AHF, AGR, ALH
1st reception
35 Hм
2nd reception
60 Hм
3rd reception
90
4th reception
90
Pulling up of bolts of fastening of a head of cylinders on the warm engine, at service or repair carrying out is not supposed.
Bolts of covers of radical bearings of a cranked shaft
Engines of 1.6 l AEH
1st reception
40 Hм
2nd reception
90
Other engines
1st reception
65 Hм
2nd reception
90
Bolts of covers шатунных bearings of a cranked shaft
All engines
1st reception
30 Hм
2nd reception
90
Engine fastening
Engines 1.6, 1.8 l
Engine support to a body
40 Н•м + 90
Engine support to a body
40 Н•м + 90
Masloslivnaja stopper
Everything, except a turbodiesel of 1.8 l (AGU)
30 Hм
Turbodiesel of 1.8 l (AGU)
50 Hм
Support of the engine/box and the pendular lever
М6
10 Н m
М8
20 Н m
М10
45 Н m
М12
65 Н m
Carving connections of support of the engine
The engine to the holder
60 Н m + 90
Support to a box
40 Н m + 90
Support to the chassis
20 Н m + 90
Box to the holder
1.8 l/125 of l.
40 Н m + 90
1.8 l/150 л.с., 1.6 l, 1.9 l TDI
60 Н m + 90
Flywheel (приводной a disk – АТ)
60 Н m + 90
Coupling basket to a flywheel
20 Н m (25 Н m AGU)
Pulley коленвала
Petrol engines
90 Н m + 90
Diesel engines
120 Н m + 90
Cam-shaft cogwheel
Petrol engines (except AGU)
100 Н m
Engines AGU
65 Н m
Diesel engines
45 Н m
Cogwheel ТНВД
20 Н m + 90
Cover of bed of a cam-shaft
20 Н m (10 Н•м AGU, AGN)
Cover рокеров a cam-shaft
10 Н m
The inlet pipeline to a head of cylinders
Petrol engines
10 Н m
Diesel engines
25 Н m
Final collector to a head of cylinders
25 Н m
Spark plugs
30 Н m
Spark plugs
30 Н m
Ljambda-probe
50 Н m
The detonation gauge
20 Н m

The general information

4-cylinder engines of various types are applied to installation in the car. Engines have water cooling and settle down across an impellent compartment. The power unit is suspended above as a pendulum on two резинометаллических support. The twisting moment is perceived by the support located below. Such fastening of the engine provides the minimum transfer of fluctuations on a body that promotes comfort increase.

The block of cylinders is executed from aluminium, cylinders запрессованы and are made of grey pig-iron. At some engines the block is entirely executed from pig-iron. The head of cylinders fastens to the block bolts. A head cast from aluminium, a saddle of valves steel, запрессованные. From a steel directing plugs of valves are executed also. The pallet картера is executed from an easy alloy. In картере the impellent oil necessary for greasing and cooling of the engine gathers.

At petrol engines fresh fuel-air the mix arrives on the one hand heads of cylinders, and combustion products leave from a head opposite side. Such scheme provides fast gas exchange through inlet and final valves. At diesel engines with I aim economy of a place the inlet pipeline and a final collector heads of cylinders are located on the one hand.

The petrol engine of 1.6 l, the diesel engine of 1.9 l: the camshaft located in a head of cylinders, is resulted in rotation by a gear belt from a cranked shaft. The camshaft through hydropushers actuates hanging vertically inlet and final valves. The diesel engine has direct injection which is carried out through located sideways at the block of cylinders the distributive fuel pump of a high pressure (ТНВД) distributive type. The pump is set in motion by a gear belt.

The engine of 1.8 l: the Engine has 3 inlet and 2 final valves. Inlet valves are set in motion by one camshaft, final other shaft. The camshaft of final valves is resulted in rotation from a cranked shaft through a gear belt. For a drive of a camshaft of inlet valves it is connected by a chain to shaft of final valves. The mnogoklapannaja scheme provides the best filling of cylinders and more effective gas exchange that more mix fuel-air in turn promotes an effective utilisation of energy. In engines of 1.8 l capacity of 92 and 154 kw applies electrohydraulic adjustment of camshafts. Adjustment of position of a camshaft of inlet valves concerning a shaft of final valves depending on number of turns of the engine is thus carried out. Engines of 1.8 l capacity 110, 132 and 154 kw have a turbo-supercharging.

All engines: Hydropushers provide automatic maintenance to constants клапанного a backlash that excludes necessity of adjustment at maintenance service carrying out.

Greasing of engines is carried out by the oil pump placed in the pallet картера. The oil pump by a chain from a cranked shaft is resulted in rotation. Oil the pump from картера moves through channels to bearings of cranked and distributive shaft, and also to working surfaces of cylinders.

The pump of a cooling liquid is located sideways in the block of cylinders and set in motion by a gear belt of the mechanism timing. It is necessary to mean that the cooling system should be all-the-year-round filled by a mix of antifreeze and means for protection against corrosion, and also water with the low maintenance to exhaust. Ridge клиновым the belt sets in motion such auxiliary units, as the generator, the pump of the hydraulic booster of a wheel and if there is a conditioner compressor.
For preparation and ignition mix fuel-air serves the control system of the engine which is not demanding service. Adjustment of the moment of ignition or idling within the limits of maintenance service is not required. It is necessary to change regularly only candles and an element of the air filter. At the diesel engine within the limits of maintenance service replace the fuel filter.
ATTENTION

The radiator fan can join at the idle engine and the switched off ignition. It can repeatedly happen owing to presence in an impellent compartment of thermal zones. Therefore at work in an impellent compartment with the warm engine it is necessary to mean possibility of unexpected inclusion of the fan. A way of elimination: расстыкуйте a socket of the electric motor of the fan.


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