pump BMW 528i 1998 E39 Owner's Guide

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11 9-2
Lubrication System
This repair group covers lubrication system troubleshooting
as well as oil pan removal and oil pump replacement.
In 6-cylinder models, removal of the oil pan requires the re-
moval of the exhaust system and some front suspension
components. Those procedures are fully covered in:
180 Exhaust System
210 Clutch
230 Manual Transmission
0 240 Automatic Transmission
310 Front Suspension
320 Steering and Wheel Alignment
NOTE-
Oil change procedure and oil filter replacement are covered
in
020 Maintenance.
CAUTIOG
V8 engines: The oil pump fasteners (including the sprocket
retaining nut) are known to vibrate loose. This can result in oil
starvation and engine failure. Be sure to check oil bolts and
nut tightness whenever the
oilpump is accessible. If any fas-
teners are found to be loose, remove them and reinstall with
Loctite
Band torque to specifications.
Special tools
The engine needs to be properly supported while the front
suspension
subframe is lowered to access the oil pan.
A standard oil pressure gauge may be used for measuring oil
pressure.
Engine support bracket
(Tool No, BMW 00 0 20012011202~2041208)
4 6-cylinder crankshalt rear main seal tools
(Tool No. BMW 00 5 50011
1 1 260)

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1 19-3
Lubrication System
V-8 crankshaft rear main seal tool
(Tool No. BMW
11 1 230)
I i 4 V-8 crankshaft rear main seal ouide
4 Adapter for BMW oil pressure gauge
(Tool No. BMW
11 4 050)
Engine lubrication
Oil pressure is generated by a gear-type pump bolted to the
bottom oi the engine block. The oil pump is chain driven off
the front of the crankshaft.
Table a. Engine oil capacity (includes oil filter replacement)
6-cylinder 6.5
liters (6.9
US qt)
V-8 7.5 liters (7.9 US qt)
The oil pressure warning system consists of an oil pressure
switch mounted in the oil circuit and an instrument
panel
warning light. Other saiety features include:
Q A filter bypass to provide lubrication should the oil filter be-
come clogged.
An oil pump pressure relief valve to prevent excessive sys-
tem pressure.
CAUTIOI\C
If the red oil pressure warning light comes on or flashes on
while driving, always assume that the oilpressure is low. Stop
the engine immediately and make arrangements to test oil
pressure.

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. .- -
L
- --
- - -. - -- Lubrication ~~stern
- Remove pressure gauge and reinstall pressure switch with
new sealing washer.
Tightening torque
Oil pressure switch to oil filter housing 27 Nm (20 ft-lb)
If testing shows low oil pressure, one or more of the following
conditions may be indicated:
Worn or faulty oil pump or faulty pump pressure relief valve
Worn or damaged engine bearings
Severe engine wear
Any of these conditions indicate the need for major repairs.
Oil pressure warning system, testing
4 When the ignition is turned on, the oil pressure warning light
comes on. When the engine is started and the oil pressure
rises slightly, the oil pressure switch (arrow) contact opens
and the warning light goes out. Make sure the oil level is cor-
rect before making tests.
- Turn ignition switch on.
- Warning light on instrument panel must light up
- Remove connector from oil pressure switch.
Warning light on instrument panel must go out.
NOTE-
If the light does not go out, the wiring to the switch is most
likely grounded somewhere between the switch terminaland
the warning light See
ELE Electrical Wiring Diagrams for
electrical schematics.
- If warning light does not light when ignition is on, remove con-
nector from oil pressure switch and use a jumper wire to
ground connector terminal to a clean metal surface. The oil
pressure warning light should come on.
NOTE-
If there are two wires to the oil pressure switch, ground the
brown/green wire that carries the signal to the warning light.
- If the warning light comes on, check the switch as described
in the next step. If the warning light does not come on, the
wiring to the instrument cluster or to the light itself is faulty.

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Lubrication system/
4 Install engine lifting tool at front of engine and raise engine
approximately
5 mm (114 in).
< Remove pinch bolt (arrow) at steering column universal joint
near steering rack. See
320 Steering and Alignment.
- Remove power steering pump, leaving hydraulic lines con-
nected to pump. Suspend pump using strong wire. See
320
Steering and Wheel Alignment.
NOTE-
For better access to power steering assembly, unbolt fluid
reservoir and suspend with wire.
Loosen upper nuts (arrow) in right and lefl engine mounts,
< Remove right and left lower engine mount nuts (arrow)
- On cars with automatic transmission, remove ATF cooler line
brackets from engine oil pan.
- Disconnect electrical harness connector at oil level sensor on
oil pan.

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-- . - .. . - Lubrication system]
- Remainder of installation is reverse of removal.
Replace self-locking nuts when reinstalling front suspen-
sion components.
Use new oil dipstick tube sealing O-ring.
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).
NOTE-
BMW does not specify a front end alignment following this
procedure.
Tightening torques Front subfrarne to body rail
(M12, use new bolts)
8.8 grade
10.9 grade
12.9 grade 77 Nrn
(57 ft-lb)
105 Nrn (77 ft-lb)
110 Nrn (81 ft-lb)
Stabilizer bar link to stabilizer bar
65 Nrn (48 ft-lb)
Steering shaft universal joint clamping bolt
(use new bolt)
19 Nrn (14 it-lb)
Lower oil pan, removing and installing (V-8)
- The V-8 engine is equipped with a 2-piece oil pan. The fas-
teners in
V-8 engine oil pump assembly, including the
sprocket retaining nut, are known to loosen and fall off into
the oil pan. Be sure to install these fasteners with Loctite
O
or equivalent thread locking product and torque to specifica-
tions.
CAUTION-
It is recommended that the oil pump retaining bolts and oil
pump drive sprocket retaining nut tightening torque be
checkedany time the
oilpan is removed.
- Raise car and place securely on jack stands.
WARNING-
Make sure the car is stable and well supported at all times.
Use a professional automotive lift
orjack stands designed for
- Remove splash shield from under engine.
- Drain engine oil
- On cars with automatic transmission, remove ATF cooler line
brackets from oil pan.

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1 19-1 7
Lubrication System
Disconnect electrical harness connect01
sensor.
. (arrow)
4 Remove lower oil pan bolts (arrows) and pan, oil
level
CAUTION-
If the lowerpan does not separate easily from upperpan, a
few taps with a rubber mallet should break it free. Do not pry
the oil pan loose.
Remove
NC drive belt tensioner.
Remove adjustment bolt
(B).
Remove retaining bolt (A) and remove tensioner from oil
pan.
- Remove power steering pump from engine block, leaving hy-
draulic lines connected. Suspend from chassis using stiff
wire. See
320 Steering and Wheel Alignment.

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Lubrication ~vsternl
Support subirame from below using BMW special tool 31 2
220 and appropriate shop lift.
Remove subirame mounting bolts (arrows) and lower
frame as far as possible. sub-
< Working through
lower oil pan opening, remove pump mount-
ing bolts (arrows).
Remove oil pump. See Oil pump, removing and install-
ing
(V-8).

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Lubr~cat~on System r- -
Working at lower rear of engine, remove oil pan retaining
bolts
(arrows).
- If necessary, remove oil cooler bracket from oil pan.
- Remove remaining oil pan bolts. Slide upper section of oil
pan forward to remove.
- Installation is reverse of removal, noting the following:
Clean sealing surfaces of debris.
- Coat joints with Three Bond 1209 O sealant.
Use new gaskets.
Install all oil pan bolts first, installing bolts at transmission
end without preload.
Tighten oil pan bolts at front end, then tighten bolts at rear
of engine.
Be sure to reinstall all oil
pump fasteners, including the
sprocl<et retaining nut, using Loctite 8 or equivalent thread
- 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
AIC drive belt tensloner
M6 10 Nm (7.5 it-lb)
M8 24 Nm (18 ft-lb)
Front axle
subframe to chassis
(Use new fasteners) 77 Nm (57 ft-lb)
Oil drain
line to upper oil pan 30 Nm (22 ft-lb)
Oil pump to crankcase 34 Nm (25 ft-lb)
Oil pan fasteners
(upperllower)
M6 8.8 10 Nm (7.5 ft-lb)
M6 10.9 (replace)
I2 Nm (9 ft-lb)
M8 8.8 22 Nm (16 ft-lb)
Steering column universal joint to
steering box (replace) 19 Nm (14 ft-lb)
Oil pressure warning switch, replacing
(&cylinder and V-8)
- In all models, the oil pressure warning switch is located at the
base of the oil filter housing.

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/Lubrication System
Oil pump, removing and installing
(&cylinder)
Oil pump assembly
(6-cylinder from 9/98)
CAUTIOI\C
Oil pump sproclcet nut has left-hand threads. Turn clockwise
to loosen.
4 Version 1, M52 oil pump assembly.
1. Oil pump pressure relief control valve
2. Oil pump suction tube
3. Suction tube support bracket
4. Oil pump assembly
5. Oil pump drive sprocltet
6. Oil pump drive chain
7. Oil pump drive sprocket nut (left hand threads)
4 Version 2, M52 TU oil pump assembly.
1. Oil pump pressure relief control valve assembly
2. Oil pump suction pick-up and seal
3. Oil pump
4. Oil pump drive sprocket
5. Oil pump shaft locking nut (left-hand thread)
6. Oil pump drive chain
Version
3, M54 oil pump assembly,
1. Drive chain
2.
MlO x 1 nut
Tighten to 25 Nm (18 ft-lb)
3. Oil pump sprocket
4. Inner pump rotor
5. Outer pump rotor
6. Oil pressure relief valve assembly
7. M8 bolt.
Tighten to 23 Nm
(17 it-lb)
8. Oil pump housing
9. Locating dowels
10. Pickup tube sealing O-ring
11. Pickup tube
12. M6 pickup tube mounting bolts
Tighten to
10 Nm (89 in-lb)

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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)