AUDI A4 1997 B5 / 1.G AFC Engine Lubrication System Components Workshop Manual

17-1


Lubrication system
components, removing and
installing Special tools

The following special tools and test equipment are
required for these operations
VAG 1342
Oil pressure tester
VAG 1527
Voltage tester
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17-2


Component layout

Modified oil circuit
CAUTION!
Do NOT overfill with oil past the MAX mark on
the oil dipstick. Damage to the three way
catalytic converter could result.
Note:

Always replace gaskets and seals
1 -
10 Nm (7ft lb)
2 -
10 Nm (7 ft lb)
3 -
Oil pan, upper
4 -
Pick-up strainer
Locks into upper oil pan with three lock
tabs
5 -
Gasket
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17-3


6 -
Oil pan, lower
7 -
10 Nm (7 Nm)
8 -
Oil drain plug
40 Nm (30 ft lb)
9 -
Cover With integrated 5 bar (72 psi) and 11 bar
(159 psi) pressure relief valves
10 -
Oil cooler
11 -
Oil filter NOT interchangeable with older versionRevised lubrication system requires
different filter: Part no. 078 115 561 D
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17-4

Oil pump, removing


Note:
If irregular valvetrain noises occur and disappear
after a lengthy drive, but always re-occur on
short drives, replace the oil retention valves.

- Remove oil dipstick and drain engine oil.

- Remove upper and lower parts of oil pan.

Note:
When installing the oil pump check alignment of oil pump drive
Tightening torques - Remove toothed belt page 13
-11
.
- Remove toothed-belt tensioner and guide pulley at oil pump.
- Remove screw plug.
- Remove oil pump.
Oil pump10 Nm (7 ft lb) Guide pulley20 Nm (15 ft lb)
30 Nm (22 ft lb)
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Screw plugToothed belt tensioner 45 Nm (33 ft lb)
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17-5

Oil retention valves, replacing


Note:

The oil retention valves must be replaced if the
valvetrain sounds noisy on short drives,
although the noise may go away on longer
drives.
When installing the oil pump, ensure that the
driver at the crankshaft engages in the oil
pump,

- Remove intake manifold.

- Remove cover plate beneath intake manifold.

Tightening torques - Replace oil retention valves (arrows).
Intake manifold20 Nm (15 ft lb) Cover10 Nm (7 ft lb) Oil retention valves25 Nm (18 ft lb)
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17-6


Revised oil circulation system

Note:

Modifications compared to previous 2.8 liter V6
(Audi 90, Audi 100).
Only the modified components should be
installed on this engine.
1 -
Oil filter
Larger outer dimensions
2 -
Oil cooler Larger cross-sectional flow area
3 -
Cover for oil pan New
4 -
Pressure relief valve New
5 -
Oil supply to engine
6 -
Oil pump New
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17-7


7 -
Pressure relief valve 11 bar
New
8 -
Oil pick-up New
9 -
Oil pressure switch 1.8 bar Color: BrownChecking page 17
-9
Dynamic oil pressure warning system
function page 17
-11

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17-8


Function of revised oil circulation
Intake side
Oil is taken in from the oil pump -6- via the oil pick-
up pipe -8-.
Pressure side
Oil pressure comes from the oil pump -6- through
the upper part of the oil pan past the pressure relief
valve -7-, oil pressure switch -9-, oil cooler -2- and
oil filter -1- to the pressure relief valve -4-.
Pressure relief valve -4- controls the oil pressure to
the engine.
The pressure relief valve -7- is a safety valve that
opens only at high RPM and cold engine
temperature.
Advantages
Oil pressure is controlled from the oil filter and oil
cooler, so that the oil pressure available at those
locations is supplied via the pressure relief valve -4-
or from the oil pump.
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17-9

Oil pressure and oil pressure switch,
checking

Operational test and servicing the visible and
audible oil pressure indicator:

Electrical Wiring Diagrams, Troubleshooting
Component Locations binder.

Test requirements

Oil level OK
Oil pressure warning light -K3- comes on
with ignition on
Auto-Check system indication OK, if
applicable.
Engine oil temperature approx. 80 C (176
F) and radiator coolant fan must have
switched on at least once

Checking oil pressure switch

- Disconnect harness connector from oil pressure
switch.
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