Audi A3

since 1997 of release

Repair and car operation

Audi A3
+ Maintenance instruction
+ Current leaving and service
- Engine
   Compression check in engine cylinders
   Engine check by means of the vacuum gage
   Removal and installation of the bottom cover of an impellent compartment
   Removal and engine/RKPP installation
   + Four-cylinder petrol engines 1.6, 1.8 of l
   + Diesel engines
   + Major maintenance
   + greasing System
+ Systems of cooling, heating
+ the Power supply system and production of the fulfilled gases
+ engine Electric equipment
+ Manual box of gear shifting
+ Automatic transmission and models with a full drive
+ Coupling and power shafts
+ Brake system
+ Suspension bracket and steering
+ Body
+ Onboard electric equipment
+ Elektroskhema

Engine

GENERAL INFORMATION

ATTENTION

Separate characteristics are provided also in the text of Head and in case of obligation of their performance are allocated with a bold print.

Engine designation//Type//release Beginning
Engine 1.6	AEH//OHC//7/96 –
Engine 1.8	AGN//DOHC//6/96 –
Engine 1.8T	AGU//DOHC//12/96-8/98
Engine of 1.8 T	AQA, AJQ, APY//DOHC//9/98 –
Engine of 1.9 TDI	AGR, ALH//OHC//6/96 –
Engine of 1.9 TDI	AHF//OHC//1/98 –
Engine of 1.9 TDI	ASZ//OHC//5/00 –
Working volume of cylinders, ^cm3
Engine 1.6	1595
Engines 1.8	1781
Engines of 1.9 TDI	1896
Capacity, kW (h.p.) at rpm//the Torque, H · m at rpm
AEH engines,	74 (101)/5600//145/3800
AGN engine	92 (125)/6000//173/4100
Engine AGU, AQA	110 (150)/5700//210/1750
AJQ engine	132 (180)/5500//235/1950
APY engine	154 (210)/5800//270/2100
TDI AGR, ALH engine	66 (90)/4000//210/1900
TDI AHF engine	81 (110)/4150//235/1900
TDI (ASZ) engine	96 (130)/4000//310/1900
Extent of compression
Engines 1.6	10.2
Engine 1.8	10.3
Engine 1.8	10.3
Engines of 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
limit of wear
1.6, 1.8	7.5
1.8Т	7.0
Diesel engines
standard value (new)
1.9 TDI	25–31
limit of wear
1.9 TDI	19
Arrangement/number of cylinders//Number of valves on the cylinder
Engines 1.6, 1.9	ryadnoye/4//2
Engines 1.8	ryadnoye/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
The 1st repair	+0.250
The 2nd repair	+0.500
Course of pistons, mm
Engines	1.6 77.4
Engines	1.8 86.4
Engines	1.9 95.5
Pistons
Gap in the cylinder	0.03
Wear limit	0.06
Piston rings
Gap in a flute, mm
Kompressionnoye	0.02–0.07
Maslosjemnoye	0.02–0.06
Wear limit	0.12
Gap in a lock/limit of wear, mm
Kompressionnoye	0.15–0.40/0.8
Maslosjemnoye	0.25–0.50/1.0
Three-componental maslosjemny 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
Gap/limit of wear, mm	0.02–0.06/0.17
Maximum ovality, mm	0.03
Shatunnye bearings
Gap/limit of wear, mm	0.01–0.06/0.12
Axial люфт crankshaft / limit of wear, mm	0.07–0.17/0.25
Klapannye gaps	Are not exposed since hydropushers are applied
Greasing system	Compulsory circulating system with the shesterenchaty oil pump
Pressure in system, a bar on idling	1.0 (2.0-1.6 л)
on 2000 rpm	3.0-4.5 (2.0 diesel engine)
Pressure of fire of a control lamp, below	1.2-1.6 (2.0 diesel engine)
Impellent oil
AUDI 500 00, AUDI 501 01, AUDI 502 00 AUDI 503 00
Amount of oil with filter replacement
All engines	4.5 l
Difference between marks of "max" and “min” in a measuring core	1 liter
Cooling system	Circulating, with the water pump, the thermostat, the fan and a lamellar and tubular radiator
Volume of cooling liquid
1.6, 1.8	5.0 l
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	unleaded, AI 95 (possibly AI 91 application with insignificant decrease in capacity) is not worse
Efforts of a tightening of carving connections
The moments of an inhaling of fixture are given also in the text and on some иллюстрациях. vydelenny in the text a bold print the moments of an inhaling are subject to exact observance; the efforts not allocated with a bold print are given only roughly
Bolts of a head of the block of cylinders
Engines of 1.8 l	AGN
1st reception	40 H · m
2nd reception	60 H · m
3rd reception	90 °
4th reception	90 °
Engines AEH, AGU, APY
1st reception	40 H · m
2nd reception	90 °
3rd reception	90 °
Diesel engines AHF, AGR, ALH
1st reception	35 H · m
2nd reception	60 H · m
3rd reception	90 °
4th reception	90 °
Pulling up of bolts of fastening of a head of cylinders on the warm engine, at carrying out service or repair is not allowed.
Bolts of covers of radical bearings of a cranked shaft
Engines of 1.6 l of AEH
1st reception	40 H · m
2nd reception	90 °
Other engines
1st reception	65 H · m
2nd reception	90 °
Bolts of covers of shatunny bearings of a cranked shaft
All engines
1st reception	30 H · m
2nd reception	90 °
Engine fastening
L engines 1.6, 1.8
Engine support to a body	40 N • m + 90 °
Engine support to a body	40 N • m + 90 °
Masloslivny stopper
Everything, except a turbodiesel of 1.8 l (AGU)	30 H · m
Turbodiesel of 1.8 l (AGU)	50 H · m
Support of an engine/box and pendular lever
М6	10 N of m
М8	20 N of m
М10	45 N of m
М12	65 N of m
Carving connections of support of the engine
The engine to the holder	60 N of m + 90 °
Support to a box	40 N of m + 90 °
Support to the chassis	20 N of m + 90 °
Box to the holder
1.8 l l/125.	40 N of m + 90 °
1.8 hp l/150, 1.6 l, 1.9 l of TDI	60 N of m + 90 °
Flywheel (a driving disk – AT)	60 N of m + 90 °
Coupling basket to a flywheel	20 N of m (25 N of m of AGU)
Crankshaft pulley
Petrol engines	90 N of m + 90 °
Diesel engines	120 N of m + 90 °
Cam-shaft cogwheel
Petrol engines (except AGU)	100 N of m
AGU engines	65 N of m
Diesel engines	45 N of m
TNVD cogwheel	20 N of m + 90 °
Cover of a bed of a cam-shaft	20 N of m (10 N • m of AGU, AGN)
Cover of rockers of a cam-shaft	10 N of m
The inlet pipeline to a head of cylinders
Petrol engines	10 N of m
Diesel engines	25 N of m
Final collector to a head of cylinders	25 N of m
Spark plugs	30 N of m
Spark plugs	30 N of m
Lambda probe	50 N of m
Detonation sensor	20 N of m

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 rezinometallichesky support. The torque 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 aluminum, cylinders are pressed and made of gray cast iron. At some engines the block is entirely executed from cast iron. The head of cylinders fastens to the block bolts. A head cast from aluminum, a saddle of valves steel, pressed. From steel also directing plugs of valves are executed. The pallet of a case is executed from an easy alloy. In a case the impellent oil necessary for greasing and cooling of the engine gathers.

At petrol engines fresh fuel – the air mix arrives on the one hand heads of cylinders, and products of combustion leave from the opposite side of a head. Such scheme provides fast gas exchange via 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.

Petrol engine of 1.6 l, diesel engine of 1.9 l: the camshaft located in a head of cylinders, is given 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 (TNVD) of distributive type. The pump is actuated by a gear belt.

Engine of 1.8 l: The engine has 3 inlet and 2 final valves. Inlet valves are actuated by one camshaft, final other shaft. The camshaft of final valves is given 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 Mnogoklapanny scheme provides the best filling of cylinders and more effective gas exchange that fuel – an air mix in turn promotes more effective use of energy. In engines of 1.8 l in capacity of 92 and 154 kW electrohydraulic adjustment of camshafts is applied. Adjustment of provision 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 in capacity 110, 132 and 154 kW have a turbo-supercharging.

All engines: Hydropushers provide automatic maintenance to constants of a klapanny gap that excludes need of adjustment at carrying out maintenance.

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

The pump of cooling liquid is located sideways in the block of cylinders and is actuated by a gear belt of the mechanism of a gazoraspredeleniye. It is necessary to mean that the system of cooling should be all-the-year-round filled with an antifreeze and means mix for protection against corrosion, and also water with the low content of lime. The ridge maple belt actuates such auxiliary units, as the generator, the pump of the power steering and if there is a conditioner compressor.
For preparation and ignition fuel – an air mix serves the control system of the engine which is not demanding service. Adjustment of the moment of ignition or idling within maintenance is not required. It is necessary to change regularly only candles and an element of the air filter. At the diesel engine within maintenance replace the fuel filter.

ATTENTION

The fan of a radiator can turn on at the idle engine and the switched-off ignition. It can repeatedly happen owing to existence 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 turning on of the fan. Way of elimination: расстыкуйте socket of the electric motor of the fan.