1999 BMW 528i BC switch

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-. .
Cylinder Head and Valvetrain -- v . -- --- --
4 Remove air filter housing and ducts:
Loosen hose clamps as necessary and disconnect electri-
cal harnesses.
- Remove air filter housing mounting fastener (arrow).
Loosen hose clamp at throttle body.
Remove air filter housing with mass air flow sensor and
duct.
Disconnect the following electrical harness connectors.
Knoclc sensors (A).
Thermostat housing (B).
Throttle position sensor/throttle position switch and idle
valve
(C).
Camshaft position sensor (D).
* Ignition coils (E).
Remove mounting nuts (arrows)
ducting. from
wiring harness

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1 17-34
1 Camshaft Timing Chain
DOUBLE VAMOS SYSTEM
(M52 TU AND M54 ENGINES)
Double VANOS system function
The M52TU and M54 6-cylinder engines are equipped with a
Double VANOS system that varies intake and exhaust cam-
shaft timing.
The main components of the Double VANOS system are:
lntalte and exhaust camshafts with helical spline inserts.
Camshaft sprockets with adjustable gears.
VANOS actuators (two position piston housing with
inter-
nallexternal helical spline cup).
Three-way solenoid switching valves.
Camshaft position impulse wheels.
Hall effect camshaft position sensors.
Camshaft position
IS varied based on engine rpm, throttle po-
sition signal, intake air and coolant temperature.

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11 9 Lubrication System
General ............................ 11 9-2
Special tools
......................... 11 9-2
..................... Engine lubrication 11 9-3
Troubleshooting .................... 11 9-3
................. Oil pressure. checking 11 9-4
...... Oil pressure warning system. testing 11 9-5
Crankshaft Rear Main Seal ......... .I1 9-6
Crankshaft rear main seal.
replacing (6-cylinder)
.................. 11 9-6
Crankshaft rear main seal. replacing (V-8)
. . 11 9-8
Engine Oil Pan .................... .I1 9-10
Oil pan. removing and
................. installing (6-cylinder) .I1 9-10
Lower oil pan. removing and
installing (V-8)
....................... 1 19-1 3
Upper oil pan. removing and
installing (V-8)
....................... 11 9-1 5
.......... Component Replacement 11 9-20
Oil pressure warning switch. replacing
.................. (6-cylinder and V-8) 11 9-20
Oil level warning switch. replacing
.................. (6-cylinder and V-8) 11 9-21
Oil pump. removing and
................. installing (6-cylinder) 11 9-22
Oil pump. removing and installing (V-8)
. . 11 9-24
..... Oil pressure relief valve (6-cylinder) 119-26
.......... Oil pressure
relief valve (V-8) 11 9-27

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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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-
I Lubrication System - I
Oil pressure, checking
The oil pressure warning switch is located at the base of the
oil filter housing.
In 6-cylinder engines access to oil pressure warning switch
connector (arrow) is extremely restricted (intake manifold re.
moved for the purpose of illustration).
V-8 engine oil pressure warning switch (arrow) is at base of
oil filter housing on left engine compartment inner fender.
Oil pressure is tested by removing oil pressure switch and in-
stalling oil pressure gauge in its place.
Unscrew oil filter cap in order to allow engine oil to drain back
down into oil pan.
Disconnect harness connector from oil pressure switch and
remove switch.
NOJE-
Thoroughly clean around the oil pressure switch before
removing it.
Be prepared to catch leaking oil with a shop towel.
- Install pressure gauge in place of oil pressure switch,
- With gauge installed, start engine and allow to reach operat-
ing temperature. Check oil pressure. See Table b.
NOJE-
For the most accurate test results, the engine oil and filter
should be new. The oil should be the correct grade.
Table b. Engine oil pressure
At idle 0.5 bar (7 psi)
At elevated speed
6-cylinder engine 4.0 bar
(59 psi)
V-8 engine 4.5 bar (66 psi)

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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
To test switch, connect an ohmmeter between terminal in
switch body (arrow) and ground. With engine off, there
should be continuity. With engine running, oil pressure
should open switch and there should be no continuity. Re-
place a faulty switch.
CAUTION-
Keep in mind that low oil pressure may be preventing the
switch from turning the light out
If the light remains on while
the engine is running, check the oil pressure as described
earlier. Do not drive the car until the problem is corrected. The
engine may be severely damaged.
Crankshaft rear main seal replacement requires removal of
the transmission and flywheel.
Crankshaft rear main seal, replacing
(&cylinder)
- Remove transmission. See 230 Manual Transmission or
240 Automatic Transmission.
- Manual transmission vehicles: Remove clutch pressure plate
and disc. See
210 Clutch.
- Remove flywheel. See 210 Clutch or 240 Automatic Trans-
mission.
- Drain engine oil.
4 Remove seal carrier bolts from oil pan (arrows). Loosen all
oil pan bolts.

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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 - 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.