oil pressure AUDI A3 1999 8L / 1.G AEB ATW Engines Lubrication System Components Workshop Manual

17-3


8 -
Bolt
25 Nm (18 ft lb)
9 -
Nut 25 Nm (18 ft lb)
10 -
Brace
11 -
Nut 25 Nm (18 ft lb)
12 -
Side brace
13 -
Bolt 20 Nm (15 ft lb)
14 -
Oil pump housing
15 -
Gears Backlash, checking Fig. 1Axial clearance, checking Fig. 2
16 -
Oil pump cover with pressure relief valve
Opening pressure: 5.7-6.7 bar (82.65-
97.15 psi)
17 -
Bolt 25 Nm (18 ft lb)
18 -
Bolt
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17-6


Part II

1 -
Oil filter bracket
2 -
Gasket Always replace
3 -
Oil retaining valve 8 Nm (71 in. lb)
4 -
Gasket Always replace
5 -
Coupling 30 Nm (22 ft lb)
6 -
Oil feed line 25 Nm (18 ft lb)To turbocharger
7 -
Bolt 20 Nm (15 ft lb)
8 -
Lower coolant pipe
9 -
Sealing washer If leaking, cut open and replace
10 -
Oil pressure switch -F1-, 1.4 bar (20.3 psi) 25 Nm (18 ft lb)
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17-22

Oil pressure and oil pressure switch,
checking


Function of dynamic oil pressure warning
system

Warning lamp, checking
With engine switched off and ignition on (terminal
15 on), oil pressure warning lamp will be lit (not
for vehicles with Auto Check system).

Warning criteria

Engine switched off and oil pressure switch
closed.
Coolant temperature less than 60 C (140
F), engine speed higher than 300 RPM and
oil pressure switch open.

Coolant temperature greater than 60 C
(140 F).

At engine speeds greater than 5000 RPM,
an active oil warning won't be erased
independent of oil pressure switch setting.
A Diagnostic Trouble Code (DTC) is
recognized when oil pressure switch is open
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17-23

Special tools and equipment

VAG1342 oil pressure tester
VAG1527B voltage tester
VAG1594A measuring appliance adapter

Test conditions
Oil level OK
Oil pressure warning light -K3- must light up
when ignition is switched on.
For vehicles with Auto Check system, "i.O"
indicator must be lit (call up symbol)
Engine oil temperature approximately 80 C
(176 F)
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17-24

Oil pressure switch, checking

- Disconnect line from oil pressure switch.

Note:
While starting engine, watch pressure tester and LED as oil pressure
switch may open during start. - Remove oil pressure switch and install VAG1342 oil pressure tester.
- Install oil pressure switch into VAG1342 oil pressure tester.
- Connect brown wire -1- of tester to Ground (GND).
- Using VAG1594 adapter, connect VAG1527B voltage tester to oil
pressure switch and Battery Positive Voltage (B+).
LED must not be lit.
- If LED is lit, replace oil pressure switch.
- Start engine.
At 1.2-1.6 bar (17.4-23.2 psi) LED must be lit.
- If LED does not light, replace oil pressure switch.
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17-25

Oil pressure, checking

- Disconnect line from oil pressure switch.

If specified values are not obtained, the pressure relief valve or the oil
pump is faulty. - Remove oil pressure switch and install VAG1342 oil pressure tester.
- Install oil pressure switch into VAG1342 oil pressure tester.
- Start engine.
Engine oil temperature approximately 80 C (176 F). Oil pressure at idle: 1.0-3.5 bar (14.5-50.75 psi)Oil pressure at 3000 RPM: 5.0-7.0 bar (72.5-101.5 psi)
- Replace oil pump Page 17
-21
.
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