2005 BMW 545i oil pressure

Downloaded from www.Manualslib.com manuals search engine 37
N62 Engine
Tensioning Rail Bearing Pin
The bearing pin for the cylinder bank 1-4 drive
chain tensioning rail is hollowed. There is a ball
(check) valve in the bearing pin. The valve
opens at an oil pressure of 1 bar and allows
engine oil to flow to the tensioning rail via a port
(1).
Chain Tensioner (cylinder bank 5-8)
An oil jet has been fitted to lubricate the cylinder bank
5-8 drive chain. There is a valve in the oil jet which
opens at a pressure of 1 bar and supplies the drive
chain with engine oil.
N No
ot
te
e:
:

Refer to the Repair Instructions when using the
Special Tools shown below to adjust the camshaft tim-
ing.
42-02-53
42-02-54 Tensioning Rail Bearing Pin
1. Engine Oil Port to Tensioning Rail
2. Ball (check) Valve
3. Bearing Pin
4. Sealing Rings for Sealing the Tensioning Rail
Chain Tensioner
1. Chain Tensioner
2. Tensioning Rail
3. Oil Jet
42-02-7842-02-79

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N62 Engine
Cooling Radiator
The radiator is made from aluminum and is divided into a high-temperature section and a
low-temperature section by a partition wall (see coolant circuit diagram). The coolant first
flows into the high-temperature section and then back to the engine, cooled.
Some of the coolant flows through an opening in the radiator partition wall to the low-tem-
perature section where it is cooled further. The coolant then flows from the low-tempera-
ture section (when the ÖWT thermostat is open) into the oil/coolant heat exchanger.
Coolant Expansion Tank
The expansion tank is mounted on the right hand wheel housing (engine compartment).
N No
ot
te
e:
:
The expansion tank should never be filled above the Max marking. Excess coolant is
expelled by the pressure relief valve in the cap as it heats up. Avoid overfilling the expan-
sion tank because the cooling circuit design ensures very good “self bleeding”.
Cooling Components
1. Cooling Radiator 4. Engine oil/air heat exchanger connection
2. Expansion Tank (hot countries only)
3. Water Pump 5. Transmission oil/coolant heat exchanger

Downloaded from www.Manualslib.com manuals search engine 49
N62 Engine
N No
ot
te
e:
:
T
Th
he
e
o
oi
il
l
c
ch
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ck
k
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d
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if
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de
es
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ig
gn
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a
an
nd
d
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sh
ho
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up
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i
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st
ta
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on
n.
.
Oil Pressure Switch
The oil pressure switch is located on the side in the bank 1-4 cylinder head.
Oil Pump
The oil pump is mounted at an angle to the crankshaft bearing cap and is driven by the
crankshaft using a roller chain. The oil pump is a two-stage gear oil pump with two paral-
lel switched gear clusters.
The two pair of gear clusters are stacked one
behind the other and work in two stages.
Stage two (both pump supply circuits) is only
active in the lower engine speed range up to
approx. 2,000 rpm to provide sufficient oil pres-
sure for the VANOS at high oil temperatures.
Stage two is deactivated hydraulically at a pres-
sure of 2 bar.
42-02-73
42-02-75
42-02-76 Oil Pump
1. Drive Shaft
2. Mounting Points
3. Oil Filter
4. Pressure Relief Valve (over 15 Bar)
5. Control Valve (Pump Stage/Pressure Control)
6. Oil supply from the oil pump to the engine
7. Oil pressure control tube from the engine to
the control valve.

Downloaded from www.Manualslib.com manuals search engine 50
N62 Engine
Oil Pressure Control
O Oi
il
l
p
pr
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co
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i
in
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ni
it
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l

p po
os
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n,
,
w
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it
th
ho
ou
ut
t
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ss
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e.
.

S St
ta
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de
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ac
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d
=
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a ab
bo
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2
2
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,
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o op
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il
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s su
um
mp
p.
.

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o
=
=
B
Bo
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th
h
p
pu
um
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p
s
su
up
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pl
ly
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c
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ui
it
ts
s
a ac
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it
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h
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2
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.

M
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a ab
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6
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,
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s
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st
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on
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e
(
(s
sl
li
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gh
ht
tl
ly
y)
)
t
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o
o
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il
l
s
su
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mp
p
r re
el
li
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ev
vi
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g
e
ex
xc
ce
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ss
si
iv
ve
e
p
pr
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ss
su
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.
Oil Pressure Control
1. Oil Pump Stage 1 5. Sealing Plug
2. Oil Pump Stage 2 6. Oil Pump Housing
3. Pressure Control Valve Piston 7. Oil Sump
4. Pressure Control Valve Spring

Downloaded from www.Manualslib.com manuals search engine 51
N62 Engine
Oil Filter
The canister type oil filter (3) is located under the
engine by the oil sump. The support for the oil
filter is integrated in the rear oil pump cover.
The oil filter housing (2 with o-ring) is threaded
into the rear of the oil pump cover through an
opening in the oil sump.
A A
d
dr
ra
ai
in
n
p
pl
lu
ug
g
i
is
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i
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nt
te
eg
gr
ra
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d
i
in
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t
th
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e
o
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l
f
fi
il
lt
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er
r
h
ho
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us
si
in
ng
g
f fo
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r
d
dr
ra
ai
in
ni
in
ng
g
t
th
he
e
f
fi
il
lt
te
er
r
a
as
ss
se
em
mb
bl
ly
y
b
be
ef
fo
or
re
e
t
th
he
e
h
ho
ou
us
s-
-
i in
ng
g
i
is
s
r
re
em
mo
ov
ve
ed
d
(
(1
1
w
wi
it
th
h
o
o-
-r
ri
in
ng
g)
).
.
The filter element support dome contains an over pressure relief valve. If the filter element
is blocked, this valve bypasses unfiltered engine oil around the element to the supply lubri-
cation to the engine.
Pressure Control
The oil pressure control valve in the oil pump has two functions:
1. Deactivates stage two oil pump circuit above 2 bar. Stage two is only active in the
lower speed range. This is to ensure that there is always sufficient oil pressure for
the VANOS units even at high oil temperatures and low speeds. The oil pump power
consumption is reduced by deactivating stage two.
2. Monitoring the required oil pressure for the engine. The piston in the control valve is
moved by a spring against the engine control pressure which is returning from the
engine. This means that precise monitoring of the actual engine oil pressure is pos-
sible.
A A
s
se
ep
pa
ar
ra
at
te
e
p
pr
re
es
ss
su
ur
re
e
r
re
el
li
ie
ef
f
v
va
al
lv
ve
e
i
in
n
t
th
he
e
o
oi
il
l
p
pu
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p
a
au
ut
to
om
ma
at
ti
ic
ca
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ly
y
o
op
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ns
s
a
at
t
t
th
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e
m
ma
ax
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im
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um
m
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re
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s-
-
s su
ur
re
e
o
of
f
a
ap
pp
pr
ro
ox
xi
im
ma
at
te
el
ly
y
1
15
5
b
ba
ar
r.
.
T
Th
hi
is
s
p
pr
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ev
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en
nt
ts
s
d
da
am
ma
ag
ge
e
i
in
n
t
th
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e
o
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il
l
p
pu
um
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p
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es
sp
pe
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ci
ia
al
ll
ly
y
a
at
t
l
lo
ow
w
o
oi
il
l
t te
em
mp
pe
er
ra
at
tu
ur
re
es
s.
.
42-02-77

Downloaded from www.Manualslib.com manuals search engine 52
N62 Engine
Oil Cooling (if equipped)
An oil cooler is used in hot countries. The oil cooler is located in front of the radiator above
the A/C condenser. The engine oil flows from the oil pump through a channel in the
crankcase to a connection on the generator support. The generator support has an oil ther-
mostat. A wax element in the oil thermostat continuously opens the inflow to the oil cooler
when the oil temperature is between 100 ºC to 130 ºC.
Some of the engine oil always flows past the oil thermostat and through the engine with-
out being cooled, even when the oil thermostat is fully open. This ensures a minimum
amount of oil is supplied when the cooler is faulty. A modified generator support, without
connections for the oil thermostat, is fitted to vehicles which do not have an oil cooler.
Technical Data - Lubrication System
The recommended oil is BMW High Performance 5W-30 Synthetic Oil
* P/N 07 51 0 017 866
O Oi
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Ca
ap
pa
ac
ci
it
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L
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it
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s









E
Ex
xp
pl
la
an
na
at
ti
io
on
n

8.0 Filling Capacity for Service with Oil Filter Change


O Oi
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P
Pr
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E
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xp
pl
la
an
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at
ti
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1.0 Minimum Oil Pressure at 20ºC

4.0 - 8.0 Bar Maximum Oil Pressure at 20ºC


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D
De
el
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Ca
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E
Ex
xp
pl
la
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at
ti
io
on
n


9-12 I/Min At Idle Speed (700 rpm) at 20ºC

50-55 I/Min At Maximum Engine Speed (6500 rpm) and 20ºC

Downloaded from www.Manualslib.com manuals search engine 53
N62 Engine
Review Questions
1. What is the function of the throttle valve?
2. What are the conditions that will result in stage two oil supply?
3. What does the term “cracked” connecting rod mean?
4. What does the low temperature area refer to in the cooling system?
5. What is the difference between the left and right drive chain tensioning assemblies?
6. How is the funnel adjustment made on the 5-8 Variable intake manifold if only one
actuating motor is used?
7. What is minimum and maximum valve lift provided by the Valvetronic system?
8. What is chamber A and chamber B used for in the Bi-VANOS system?
9. What retains the initial VANOS sprocket to hub position when oil pressure is not pre-
sent?
10. How should the drive belt be removed?