1998 BMW 528i Air

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Camshaft Timing chain1
- Disconnect negative cable (-) from battery.
CAUTION-
Prior to disconnecting the battery, read the battery discon-
nection cautions given
in 001 General Cautions and
Warnings.
4 Removing top and side engine covers:
Press down on locking pins (arrows) to release locks. Lifl
intake manifold cover straight up to remove.
Pry out caps from side covers.
Remove fasteners
and covers.
NOTE-
Some early models use
pry out trim caps and fasteners to
hold the top cover in place.
Disconnect electrical harness connectors at ignition coils
(A).
Remove left and right side ignition coil mounting fasteners
and coils.
NOTE-
Make note of location of ground strap (arrow).
Remove spark plugs.
- Remove posltlve (+) terminal cable from left cylrnder head
cover.
- Unbolt left and right side cable ducts from fuel rail
Remove air filter housing and mass air flow sensor:
Disconnect mass air flow sensor and intake air tempera-
ture sensor electrical harnesses
(A and B).
Remove air filter housing mounting fastener (arrow)
Loosen intake hose clamp
(C).
Remove air filter housing with mass air sensor and intake
duct from throttle body assembly.

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Camshaft Timing chain/
Camshaft timing, checking and adjusting
(M62 engine)
WARNING -
Allow engine to cool before beginning this procedure. 1
- Working inside luggage compartment, disconnect negative
battery cable.
CAUTIOI\C
Prior to disconnecting battery cable, read the battery discon-
nection cautions given
in 001 General Cautions and
Warninss.
4 Removing plastic top covers:
Press down on locking pins (arrows) to release locks. Lift
intake manifold cover straight up to remove.
Pry out caps from side covers.
Remove fasteners from beneath
caDs. Lift off covers.
4 Remove air filter housing and ducts:
Disconnect mass air flow sensor and intake air tempera-
ture sensor electrical harnesses
(A and B).
Remove air filter housing mounting fastener (arrow).
Release hose clamp at intake air duct on base of air filter
housing.
Loosen intake hose clamp
(C) and release hose from
mass air flow sensor.
Remove hose at idle air stabilizer.
Release hose clamp at throttle body and remove hose.
Remove upper air filter housing with mass air flow sensor.
- Unbolt left and right side cable ducts from fuel rail.

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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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. .- -
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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11 9-1 0
Lubrication System
Oil pan, removing and installing
(6-cylinder)
The engine oil pan removal procedure requires that the en-
gine be supported from the top and the front suspension
sub-
frame be lowered.
- Raise car and place securely on jack stands.
Make sure the car is stable and well supported at all times.
Use a professional automotive
lift orjackstands designed for
- Remove splash shield from under engine.
- Drain engine oil as described in 020 Maintenance.
4 Remove oil dipsticlc guide tube:
Disconnect fuel lines and wiring harness from
bracket (A).
- Disconnect oil separator hose (B) from base of guide tube.
Remove mounting bolt
(C) from left engine mounting
bracket and remove tube from oil pan.
NOTE-
* If necessary, remove air filter assembly for better access to
dipsticlc tube.
The dipstick guide tube is sealed in the block using an
O-
ring. Check that the O-ring comes out with the tube.
4 Lift hood into assembly position:
While supporting the hood, disconnect hood support
struts.
Raise hood and install
loclting bolts (arrow) in right and left
hinges.
WARNING-
Be sure to support hood while disconnecting support struts.

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... . . Lubrication sy=
Upper oil pan, removing and installing (V-8)
The engine oil pan removal procedure requires that the en-
gine be supported from the top and the front suspension
sub-
frame be lowered.
- Disconnect negative (-) battery cable
4 Lift hood into assembly position.
- While supporting hood, disconnect support struts.
Open hood
fully and lock in piace by installing bolts
(arrow) in left and right hinges to lock hood in place
4 Remove engine top cover:
- Early version: Pry off caps (arrows) and remove fasteners.
Late version: Depress fasteners (arrows) and lift cover.
4 Remove air filter housing and mass air flow sensor:
Disconnect mass air flow sensor
(A) and intake air temper-
ature sensor
(B) electrical harness connectors.
Remove air filter housing mounting fastener (arrow)
Loosen
intake hose clamps (C and D).
Remove air filter housing with mass air flow sensor.
Remove intake hose from throttle body.

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Ignition System
This repair group covers component troubleshooting and re-
placement information for the ignition system.
When diagnosing engine management problems, including
on-board diagnostics (OBD
11) fault code analysis, also refer
to these repair groups:
* 130 Fuel Injection
* ELE Electrical Wiring Diagrams
OED On-Board Diagnostics
Special tools
System diagnosis and testing of the ignition system requires
special test equipment.
4 LED test light
(Tool No. Baum
1 1 15)
4 Automotive digital multimeter
4 Primary voltage test harness
(Tool No. BMW 12
7 020)
-
4 Secondary voltage test harness
(Tool No. BMW 12
7 030)

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Lnition switch
4 The positive (+) power supply to the ignition coils comes to
the ignition switch via an unloader relay. When the ignition
switch is turned on, the relay closes, to provide voltage to the
ignition coils. The coils are then actuated at the negative side
by the engine control module.
NOTE-
Schematic diagrams shown are for illustrative purposes only.
See ELE Electrical Wiring Diagrams for engine manage-
ment specific wiring information.
WARNING- Do not touch or disconnect any cables from the coils while
the engine is running or being cranked by the starter:
The ignition system produces high voltages that can be
fatal. Avoid contact with exposed terminals. Use ex-
treme caution when
working on a car with the ignition
switched on or the engine running.
* Connect and disconnect the DME system wiring and
test equipment leads only when the ignition is
OFF
Before operating the starter without starting the engine
(for example when
making a compression test), always
disable the ignition.
4 Knock sensors (arrows) monitor the combustion chamber for
engine-damaging knock. Six-cylinder models (shown) use
two sensors with each sensor monitoring three cylinders.
V-
8 models use four sensors, each monitoring two cylinders. If
engine
knock is detected, the ignition point is retarded by the
ECM.
I Ignition advance Ignition timing is electronically mapped and not adjustable.
The ECM uses engine load, engine speed, coolant tempera-
ture, knock detection, and intake air temperature as the basic
inputs for timing control.
A three dimensional map similar to
the one shown is digitally stored in the ECM.
- The initial ignition point is determined by the crankshaft
speed sensor during cranking. Once the engine is running.
timing is continually adjusted based on operating conditions.