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

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
Pa
ge 3 of 15 Lubrication s
ystem com
ponents, removin
g and installin
g
11/21/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.GE01.17.1

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
Pa
ge 7 of 15 Lubrication s
ystem com
ponents, removin
g and installin
g
11/21/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.GE01.17.1

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.
Pa
ge 9 of 15 Lubrication s
ystem com
ponents, removin
g and installin
g
11/21/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.GE01.17.1