low oil pressure BMW 528i 1997 E39 Owner's Manual

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Lubrication System
- Lower front suspension and remove oil pan, as described
earlier, to gain access to oil pump.
Remove oil pump
sprocket mounting nut (left-hand thread)
(arrow). Lift sprocket off together with drive chain.
Engines produced to 9/98: Remove oil pump with pick-up
tube. Pick-up tube is bolted to side of oil pump.
Engines produced from 9/98 to 01/00: Remove pick-up
tube, scraper tray and oil pump as a unit.
Engines produced from 01/00: Remove oil pump pick-up
tube bolts and remove pick-up tube before removing pump.
Remove mounting bolts from oil pump. Withdraw pump.
NOTE-
Record location of any spacers between pump and engine
bloclc Note positions of locating dowels.
- Remove cover from oil pump and check for wear or scoring.
Spin oil pump shaft and
check that gears turn smoothly. Re-
place pump if gears spin with difficulty
orany wear is present.
- Inspect oil pressure relief valve as described later.
- Installation is reverse of removal, noting the following:
Replace pick-up tube O-ring (if applicable).
- Align sprocket splines to oil pump shaft spl~nes before
tightening sprocket nut.
- After adding engine oil, start and run engine. Raise engine
speed to 2,500 rpm until oil pressure warning light goes out
(about 5 seconds).
Tightening torques Oil drain plug to oil pan 25
Nm (18 ft-lb)
Oil pan to engine
bloclc
M6 (8.8 grade)
M6 (10.9 grade)
M8 (8.8 grade)
10 Nm (89 in-lb)
12
Nrn (9 ft-lb)
22 Nm (16 ft-lb)
Oil pump sprocket to oil pump shait
(M10 x 1) (left hand thread)
25 Nm (1 8 it-lb)
Oil pump to crankcase (ME) 22 Nm (1 6 it-lb)
Oil pump pickup tube to cranltcase (M6) 10 Nm (89 in-lb)

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11 9-26
/Lubrication System
< Use Allen wrench to adjust chain slaclc (B) by turning thread-
ed spacer
(A).
Oil pump chain adjustment
Slack
10 52 mrn (0.394i0.079 in)
- Coat remaining oil pump mounting fastener with Loctite 03. In-
stall and tighten.
- Remainder of assembly is reverse of disassembly.
- After adding engine oil, start and run engine. Raise engine
speed to
2,500 rpm until oil pressure warning light goes out
(about
5 seconds).
Tightening torques
Lower oil pan to upper oil pan
M6 (8.8 grade) 10
Nm (89 in-ib)
M6 (10.9 grade) 12
Nm (9 ft-lb)
M8 (8.8 grade) 22
Nrn (1 6 ft-lb)
Oil drain plug to oil pan (M12) 25 Nm (I8 ft-lb)
Oil pump cover to oil pump
(M6) 10 Nrn (89 in-lb)
Oilpump sprocket to shaft TKO) 45 Nm (33 it-lb)
Oil pump to engine bloclc
M8 (8.8 grade) 22 Nrn (16 ft-lb)
Oil pressure relief valve (&cylinder)
Remove oil
pump as described earlier. The oil pump pressure
relief valve is held in the side of the
oil pump with a circlip.
< Inspect oil pump relief valve components and bore for scor-
4. Sleeve
5. Circlip
- Install using a new circlip.
Oil
pressure relief valve assembly
,- ..., !~. -.-~. - ~- -~!~~-% h. .- .,, /to-cy~~noer engrnej ing or other damage.
1. Control plunger
2. Spring
3. Sealing O-ring

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Fuel lniection I
4 Remove complete air filter housing:
Disconnect electrical harness connector on mass air flow
sensor
(A).
Disconnect vacuum line at intake boot (B).
Loosen Intake air duct clamp (C).
Remove filter housing mounting screws
Disconnect air duct and
lift complete air filter housing and
MAF sensor out of engine compartment, pulling it forward
away from throttle housing.
- Pull throttle cable upwards out of rubber retainer and unhoolc
ball end of cable from throttle actuator.
4 Remove nuts and bolts (arrows) retaining wiring harness to
throttle housing.
- Working at throttle housing, turn harness plug counterclock-
wise and remove plug.
4 Working at side of intake manifold, disconnect electrical har-
ness connectors:
Idle control valve (A)
lntalce manifold resonance valve (B)
- Disconnect electrical harness connectors at oil pressure
sender and oil temperature sender at base of oil filter hous-
ing.
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130-36
[~uel Injection
4 Remove nuts and bolts (arrows) retaining wiring harness to
throttle housing.
- Working at throttle housing, turn harness plug countercloclc
wise and remove.
4 Working at side of intake manifold, disconnect electrical bar-
ness connectors:
Idle control valve (A)
Intake manifold resonance valve (B)
- Disconnect electrical harness connectors at oil pressure
sender and oil temperature sender at base of oil filter hous-
ing.
4 Remove dipstick guide tube:
Disconnect wiring harness brackets from tube
(A)
Unclip fuel lines from tube (B).
Remove lower guide tube mounting bolt (C).
Pull out dipstick guide tube.

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130-43
Fuel Injection ]
I I I
12 llnput IFeedback signal, engine start /Starter
Table c. Siemens MS 42.0 and MS 43.0 ECM pin assignments (continued)
I I - I
13 Input /I Alternator (generator) Notes
Throttle
valve
Crankshaft position sensor
Throttle valve (MS
42.0)
Throttle valve
Pin
6
7
8
9
10
11
14
15
16
17
18
19
20
I 1- I
23 l~round I~round, intaite air temperature sensor /Intake air temperature sensor
Signal
Output
Input
Input
Input
I I I
Component/function
Not used
Throttle valve supply potentiometer
2
Signal, crankshaft position sensor
Signal,
pedal position sensor 2 (MS 42.0)
Signal, throttle position sensor 1
Not used
Ground
Ground
Input
Ground
Ground
Input
Ground Cranltshaft position sensor
21
24
25
26
27
28
29
30
I 1- I
33 1 input ISignal, cylinder 1 fuel injector /cylinder 1 fuel injector
Ground, throttle position sensor (MS
42.0)
Ground, exhaust camshaftsensor I
Signal, pedal position sensor 1 (MS 42.0)
Ground, mass air flow sensor
Ground, intake camshaft sensor
1
Signal, throttle potentiometer 1
Ground, throttle position sensor
22 loutput I~ignal, intake air temperature Ilntake air temperature sensor
I I - I
Throttle
valve (MS 42.0)
Camshaft position sensor I
Throttle valve (MS
42.0)
Hot film mass air flow sensor
Camshaft position sensor i
Throttle valve
Throttle valve
Ground
Output
Ground Input
Output
Ground
Output
Out~ut
Ground, crankshaft position sensor
Knoclt sensor
31
34
35
36
37
38
39
Signal, coolant temperature sensor
Ground, coolant temperature sensor
Signal,
oil pressure
Signal, engine
oil temperature sensor
Ground, engine oil temperature sensor
Signal, knock sensor
Signal, knock sensor
32 loutput ISignal, ltnock sensor l~nock sensor
40
41
Coolant temperature sensor
Coolant temperature sensor
Oil pressure switch
Oil temperature sensor
Oil temperature sensor
Knoclt sensor
I Output
Input
input
Input
Input
Input
Inout
Signal, knock sensor
Input
Input Signal, cylinder
2 fuel injector
Signal, cylinder
3 fuel injector
Signal, cylinder
4 fuel injector
Signal, cylinder
5 fuel injector
Signal, cylinder
6 fuel injector
Sianai, oil level sensor Cylinder
2 fuel
injector
Cylinder
3 fuel injector
Cylinder
4 fuel injector
Cylinder
5 fuel injector
Cylinder
6 fuel injector
Oil level sensor
-
Signal. VANOS inlet valve
Signal. VANOS outlet valve VANOS
inlet valve
VANOS outlet valve

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Fuel Injection I
Connector X60004 (continued)
8 10
11
12
13
14
15
16
9
Output 0
Input
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
39
llnput lsignal l~oolant outlet temperature sensor
Output
Output
Ground
Input
Output
I I - I
40 /output Istart signal Istarter relay
Pedal position sensor (PWG), signal
Output Input
Output
input
Input
Input
Input
Input
Input
input
Input
Output
Input/-output
Input/-output
37
Connector X60003
Pedal position sensor
Fuel pump relay, activation
Oil pressure indicator Pedal position sensor (PWG), ground
Pedal position sensor (PWG), signal
Pedal position sensor (PWG), power supply
Not used
Not used Fuel
pump relay
Instrument cluster
Pedal position sensor
Pedal position sensor
Pedal position sensor
Engine speed signal output (TD)
Not used
Signal
back-up light
DM-TL (diagnostic module,
tank leakage)
Signal oil level sensor
Right rear wheel speed, signal
Clutch pedal position switch, signal
Brake light switch, signal
Not used
Voltage supply, terminal
15
Data link, MFL (multi-function steering wheel)
Brake light test signal
AJC compressor signal
DM-TL (diagnostic module, tank
leakage)
Not used
Diagnosis signal
TxD
Communication link (EWS)
Not used
Not used
CAN-BUS hiqh
38 1 Ground l~round I Coolant outlet temperature sensor
OED II plug
Integrated instrument cluster control module (IKE)
Light module
ABSIDSC control module
Clutch pedal position switch
Brake light switch
Fuse
F14
Airbag contact coil spring
Brake light switch
Heating and
A/C control module
OBD
II plug
Electronic immobilizer (EWS)
CAN-Bus link
CAN-Bus link
Input/-output CAN-Bus low

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Warnings and cautions
Obse~e the following warnings and cautions when worlting
on the cooling system.
WARNING -
. At normal operating temperature the cooling system is
pressurized. Allow the system to cool as long as possible
before opening (a minimum of one hour), then release the
cap slowly to allow safe release ofpressure.
a Releasing the coolant system pressure lowers the cool-
ant boilingpoint and the coolant may boil suddenly. Use
1 heavy and wear eye and face protection to
guard against scalding.
Use extreme care when draining and disposing of en-
gine coolant. Coolant is poisonous and lethal to hu-
mans andpets. Pets are attracted to coolant because
of its sweet smell and taste. Seek medical attention im-
mediately if coolant is ingested.
CAUTIOG
Avoid adding cold water to the coolant while the engine is
hot or overheated. If it is necessary to add coolant to a
hol
system, do so only with the engine running and coolanl
pump turning.
To avoid excess silicate gel precipitation in the cooling
system and loss of cooling capacity, use BMW coolant
or equivalent low silicate antifreeze.
a If oil enters the cooling system, the radiator, expansion
tank and heating circuit must be flushed with cleaning
agent. BMW recommends removal of the radiator and
expansion
tank to flush.
When
worlcing on the cooling system, cover the alter-
nator to protect it against coolant drips.
Prior to disconnecting the battery, read the battery dis-
connection cautions given in
001 General Warnings
and Cautions.
Begin the diagnosis of cooling system problems with a thor-
ough visual inspection.
If no visual faults are found, it is rec-
ommend that the engine control module (ECM) fault memory
be checked for stored diagnostic trouble codes
(DTCs) using
BMW scan tool
DlSplus or equivalent.

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170-8
I Radiator and Cooling System
Common cooling system faults can be grouped into one of 4
categories:
Cooling system
lealts
Poor coolant circulation
Radiator cooling fan faults
Electrical/electronic faults
Cooling system inspection
- Check that coolant pump drive belt tensioner is functioning
properly and that belt tension is correct. Belt tensioner sys-
tems for the different models are shown in
020 Maintenance.
- Check condition of coolant pump drive belt.
- Checlc coolant hoses for cracks or softness. Checlc clamps
for looseness. Check coolant level and check for evidence of
coolant
lealts from engine.
- Check that radiator fins are not blocked with dirt or debris.
Clean radiator using low-pressure water or compressed air.
Blow outward, from engine side out.
- To check coolant pump:
Remove mechanical cooling fan. See Mechanical
(vis.
cous clutch) cooling fan, removing and installing.
Remove drive belt from coolant pump pulley. See
020
Maintenance.
Firmly grasp opposite sides of pulley and check for play in
all directions.
Spin pulley and check that shaft runs smoothly without
play.
NOTE-
The coolant provides lubrication for the pump shaft, so an oc-
casional drop of coolant
lealing from the pump is acceptable.
If coolant drips steadily from the vent hole, replace the pump.
- At normal engine operating temperature, cooling system is
pressurized. This raises boiling point of coolant.
Leaks may
prevent system from becoming pressurized. If visual evi-
dence is inconclusive, pressure test cooling system as de-
scribed later to help pinpoint hard-to-find leaks.
- If cooling system is full of coolant and holds pressure:
- Use an appropriate scan tool to interrogate engine control
module (ECM) for radiator fan or DME control circuit faults.
Checlc for loose or worn drive belt.
0 Test for failed thermostat or coolant pump impeller. Some
pumps may be fitted with plastic impellers.

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Anach pressure brake bleeder to fluid reservoir and pump
bleeder a few times to pressurize hydraulic fluid system.
CAUTION-
* Do not exceed 2 bar (29 psi) pressure at the fluid resenfoil
when bleeding or flushing the hydraulic system.
Brake fluid is poisonous, highly corrosive and danger-
ous to the environment. Wear safety glasses and
rub-
bergloves when working with brake fluid. Do not siphon
brale fluid with your mouth. Immediately clean away
any fluid spilled on painted surfaces and wash with wa-
ter, as brale fluid will remove paint.
Always use new brake fluid from a fresh, unopened
container.
Brake fluid will absorb moisture from the air.
This can lead to corrosion problems in the clutch and
brake hydraulic systems, ;nd will also lower the brake
fluid boiling point. Dispose of brale fluid properly.
- Raise and safely support vehicle.
WARNING-
Make sure the car is stable and well supported at all times.
Use a professional automotive lift orjackstands designed for
the purpose. A floor
iack is not adequate support.
- If necessary, remove transmission splash shield.
Hydraulic system, bleeding
Worlting underneath transmission, connect a hose from
clutch slave cylinder bleeder valve
(arrow) to a container.
Open bleeder valve and allow bralte fluid to expel until
clean fluid comes out, free of air bubbles.
Close bleeder valve and disconnect pressure bleeding
equipment from fluid reservoir.
Slowly operate clutch pedal about
10 times. Fill reservoir
with clean fluid as necessary.
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- Raise and safely support vehicle
WARNING-
Make sure the car is stable and well supporied at all times.
Use a professional automotive /iff orjack stands designed for
the
ournose. A floor jack is not adeouate suooort.
- If necessary, remove transmission splash shield.
- Disconnect fluid line from slave cylinder on lefl side of trans-
mission. Place pan under hose to catch dripping fluid.
4 Working underneath transmission, remove slave cylinder
mounting nuts (arrow) from clutch housing and remove
cylinder.
- Installation is reverse of removal, noting the following:
Check for wear on slave cylinder. Any wear except on tip is
caused by misalignment of clutch components.
Lightly coat
pushrod tip with molybdenum disulfide grease
(MolyltoteIB Longterm or equivalent).
. During installation be sure pushrod tip engages recess in
clutch release lever.
Fill fluid reservoir with clean fluid.
. Bleed clutch hydraulics as described earlier.
Tightening
toraues - -.
Clutch slave cylinder to transmission 22 Nm (16 R-lb)
Fluid line to slave cylinder 17 Nm (13 ft-lb)
The transmission must be removed from the engine to access
the clutch mechanical components. It is recommended that
the clutch disc, pressure plate and release bearing be re-
placed during a clutch overhaul.
Besure tocheck the bottom of the bellhousing foroil. If engine
oil is found, check for a faulty rear crankshaft main oil seal.
See
119 Lubrication for rear main seal replacement.
Clutch variations
Two versions of the clutch are used:
1997 528i (6 cylinder) uses traditional clutch components.
All
540i (V-8) and 1998 and later 6 cylinder models from
use a self-adjusting clutch (SAC).