1999 BMW 540i gas cover

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[camshaft Timina Chain
< Remove cylinder head cover sealing gaskets from lefl cylin-
der head cover. Install
BMW special tool 11 1 412 into gasket
groove of cylinder head cover.
Install lefl cylinder head cover. Fit cylinder head cover re-
taining nuts to cylinder head cover studs at cylinders
5 and
6 (first two cylinders on left side cylinder bank).
Tighten nuts uniformly in
'I2 turn steps
Tightening torque
Timing case cover to head
15 Nm (1 1 ft-lb)
- Remove special tool 11 1 41 2 and install new gaskets to cyl-
inder head cover:
Clean gasket groove and install new gasket.
Apply Three Bond
12098sealant tojoint between cylinder
head and timing cover and at half-moon shaped cut-outs.
Tighten cylinder head cover nuts.
Tightening torque Cylinder head cover to head
I5 Nm (1 1 ft-lb)
- Remainder of installation is reverse of removal, noting the fol-
lowing:
Where applicable remove protective film from gaskets.
Use new gaskets when mounting intake manifold. Tighten
nuts finger tight first, then torque to specification in stages
worlting diagonally from center out.
Ground straps for ignition coil harnesses are at cylinders
no.
3 and no. 7. See 120 Ignition System.
Refill and bleed cooling system as described in
170 Radi-
ator and Cooling System.
Change engine oil and filter as described in
020 Mainte-
nance.
CAUTIOI\C
To prevent damaging engine electrical systems, be sure to in-
stall ail ground wires previously removed.

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Camshaft Timing chain/
- Tighten accessible sprocket retaining bolts in the following
order:
Leit exhaust camshaft
Right exhaust
camshait
Leit intake camshaft
Right
intalte camshait
Tightening torque
Sprocket bolts to camshaft flange
15 Nm (1 1 ft-lb)
- Remove BMW special tool 11 2 300 from tool bore at bell-
housing and remove
camshaft loclting tools from cylinder
heads.
Using crankshaft center bolt, turn engine over clockwise at
least one
comolete rotation so that remainino camshaft
sprocltet
retaking bolts are accessible. -
- Tighten remaining camshait sprocket retaining bolts
Tightening torque Sprocket bolts to camshaft
flange 15 Nm (I 1 It-lb)
- Remove BMW special tool 11 3 390 from primary timing
chain tensioner bore and reinstall primary chain tensioner
- Remainder of installation is reverse or removal, noting the fol-
lowing:
Remove gasket residue from cylinder head sealing sur-
face.
Apply a thin bead of Three Bond 1209
O sealing com-
pound to joints at cylinder head cover and timing case cov-
er and at half-moon sections at rear of cylinder heads.
Replace cylinder head cover
gaskets if necessary.

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119-12
Lubrication System 1
4 Support subframe from below using BMW special tool 31 2
220 and appropriate shop lift. Remove
subframe mounting
bolts and lower
subframe as far as possible.
Remove oil pan screws (arrows) at cylinder block and trans-
mission bellhousing. Lower and remove oil pan.
NOTE-
If oil pan will not slide backwards, disconnect stabilizer bar
links and lower front axle support further.
If the oil pan does not separate easily from the engine cylin-
der
block, a few taps with a rubber malletshould breakit free.
Do not
pry the oil pan loose.
When installing oil pan: Thoroughly clean all old gasket material from mating sur-
faces and use a new gasket.
Apply a small amount of non-hardening sealer
(3 Bond
12098 or equivalent) to oil pan gasket directly below joints
(arrows) for end cover and front timing case cover. Apply
a bead
3 mm wide by 2 mm high.
Install all oil pan bolts finger tight. Tighten oil pan bolts to-
ward front of engine first, then pan bolts at transmission
end.
Tightening
torques
Oil drain plug to oil pan (M12) 25 Nm (18 ft-lb)
Oil pan to engine block
MG (8.8 grade)
MG (10.9 grade)
M8 (8.8 grade)
10 Nm (89 In-lb)
12 Nm (9 ft-lb)
22 Nrn (16 R-lb)

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.-. .
Battery, Starter, Alternator
Warnings and cautions
WARNING -
Wear goggles, rubber gloves, and a rubber apron when
working around the battery or battery acid (electrolyte).
Battery acid contains sulfuric acid and can cause skin
irritation and burning.
If acid is spilled on your skin or
clothing, flush the area at once with large quantities of
water. If electrolyte gets into your eyes, flush them with
large quantities of clean water for several minutes and
call a physician.
Batteries that are being charged or are fully charged
give off explosive hydrogen gas. Keep sparks and open
flames away. Do not
smoke.
CA UTIOI\C
Only use a digital multimeter when testing automotive elec-
trical components.
. If a repair procedure specifies disconnecting the bat-
tery, follow the instruction for safety reasons.
Prior to disconnecting the battery, read the battery dis-
connection cautions in
001 General Cautions and
Warnings.
Models with MS43 engine management: Allow at least
3 minutes to elapse after turning ignition ley to OFFpo-
sition before disconnecting battery. This willallow sum-
cient tinie to complete the DMJL (fuel tank pressure)
test
* Disconnecting the battery cables may erase fault codes
stored in ECM memory.
Always disconnect the negative
(-) battery cable first
and reconnect it last. Cover the battery post with an in-
sulating material whenever the cable is removed.
Do not disconnect battery, alternator or starter wires
while the engine is running.
0 Never reverse the battery cables. Even a momentary
wrong connection can damage the alternator or other
electrical components.
Do not depend on the color of insulation to tell battery
positive and negative cables apart. Label cables before
removing.
The slide-tilt sunroof may fail to function properly
after
disconnecting and reconnecting the battery. Reinitial-
ize sunroof as described in 540 Sunroof.

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121-9
Battery, Starter, ~lternatorl
Battery charging
Discharged batteries can be recharged using a batterycharg-
er. Remove the battery from the trunk during charging.
Prolonged charging causes electrolyte evaporation to a level
that can damage the battery. It is best to use a low-current
charger
(6 amperes or less) to prevent battery damage
caused by overheating.
WARNING -
Hydrogen gas given off by the battery during charging is ex-
plosive. Do not smoke.
Keep open flames away from the top
ofthe batte~ and prevent electrical sparks by turning off the
battery charger before connecting or disconnecting it.
Battery electrolyte (sulfuric acid) can damage the car. If
electrolyte is spilled, clean the area with a solution
ofbak-
ing soda and water.
Always allow a frozen battery to thaw before attempting
to recharge it.
Always disconnect both battery cables and remove bat-
tery from vehicle during battery charging. Do not ex-
ceed
16.5 charging voltage at the battery
Battery safety terminal, replacing
If the battery safety terminal has been triggered, investigate
and correct the cause prior to replacement.
- Working in right side of luggage compartment, remove bat-
tery trim panel.
- Disconnect negative (-) battery terminal and cover with
insulator.
- Disconnect positive (+) cable from battery.
- Release positive (+) cable from cable brackets on luggage
compartment wall. Lay new repair cable parallel to positive
cable.
- Mark off length of new cable on old cable. Allow 10 cm
(2.5 in) of slack.
- Saw through old cable.
Do not use bolt cutters or similar tools to cut through cable.
A cable end that has been squashed
flat will not fit into the

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130-72
Fuel Injection
I Oxygen sensors, replacing
4 Four Bosch oxygen sensors (2 precatalytic converter sen-
sors and
2 post-catalytic converter sensors) provide a vary-
ing voltage signal
[0.2 vdc (max. lean) to 0.8 vdc (max. rich)]
to the ME
7.2 ECM representing oxygen content in the ex-
haust gas.
WARNING-
Exhaust manifolds and pipes can be hot enough to cause se-
rious burns. Wear suitable heavy gloves and other appropri-
ate protection.
- Using a special oxygen sensor socltet, remove the threaded
sensors from the exhaust system.
- If not already applied, coat the new oxygen sensor threads
with an anti-seize compound before installation. Do not get
compound on the sensor tip.
Tightening torque
Oxygen sensor to exhaust system
50 Nm (37 ft-lb)
Fuel injectors, removing and installing
The ME 7.2 system uses ball seat type fuel injectors. This de-
sign
prov:des precise seal'ng when the iniector is closed
therebv eiminalinq raw HC (unb~rned fue ) formalion in tne
intake.-~he fuel inkctors areswitched on and off by the ECM
at the ground side.
- Remove plastic cover from above fuel rail. See100 Engine
Removal and Installation.
- Disconnected battery negative (-) cable.
CAUTION-
Prior to disconnecting the battea read the battery discon-
nection cautions given at the front of this manual. See 001
General Warnings and Cautions.
- Remove both ignition coil covers.
Disconnect ignition coil connectors.
Remove left and right ignition coil ground wires,
4 Remove fuel injector loom boxes.
Loosen mounting fasteners
(A).
Disconnect electrical plugs (B and D).

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Fuel Tank and Fuel Pump
Warnings and cautions
Observe the following warnings and cautions when servicing
the fuel system.
WARNING-
* The fuel system is designed to retain pressure even when
the ignition is off. When working with the fuelsystem, loos-
en the fuel lines slowly to allow residual
fuel pressure to
dissipate. Avoid spraying fuel. Use shop rags to capture
leaking fuel.
Before beginning any work on the fuel system, place a
fire extinguisher in the vicinity of the work area.
Fuel is highly flammable. When working around fuel, do
not disconnect any wires that could cause electrical
sparks. Do not smoke or worknearheaters or other fire
hazards.
* Always unscrew the fuel tank cap to release pressure
in the
tanlc before working on the tank or lines.
When disconnecting a fuel hose, wrap shop rag around
end of hose to prevent spray of fuel under pressure.
Do not use a work light with an incandescent bulb near
any fuel. Fuel may spray on the hot bulb causing a fire.
0 Make sure the worlc area is properly ventilated.
CAUTION-
- Prior to disconnecting the battery, read the battery discon-
nection cautions given in
001 General Cautions an4
Warnings.
Before
making any electrical tests with the ignition
turned on, disable the ignition system as described in
120 Ignition System. Be sure the battery is discon-
nected when replacing components.
To prevent damage to the ignition system or other DME
components, including the engine control module
(ECM), always connect and disconnect wires and test
equipment with the ignition off.
Cleanliness is essential when
worl~ing with the fuel sys-
tem. Thoroughly clean the fuel line unions before dis-
connecting any of the lines.
Use only clean tools. Keep removed parts clean and
sealed or covered with a clean, lint-free cloth, especial-
ly if completion of the repair is delayed.
Do not move the car while the fuel system is open.
Avoid using high pressure compressed air to blow out
lines and components. High pressure can rupture inter-
nal seals and gaskets.
Always replace seals, O-rings and hose clamps.

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170-1 9
Radiator and Cooling System
Coolant pump Remove thermostat housing fasteners
(arrows) and remove
thermostat housing.
Installation is reverse of removal, noting the following:
- Keep sealing faces clean and free of oil.
Use new sealing gasket.
Fill system with coolant. See Coolant, draining and fill-
ing
(V-8 models).
Tightening torques
Block drain plug to block 25 Nm (18 it-lb)
Coolant hose clamp (32
- 48 2. 5 Nm (22 in-lb)
mm hose diameter)
Radiator drain plug to radiator 2
- 3 Nm (18 - 27 In-lb)
Thermostat cover to
coolant pump 10 Nm (89 in-lb)
Coolant pump, replacing (6-cylinder
models)
< The engine coolant pump is mounted in the front of the en-
gine in the timing chain cover.
- Drain cooling system as described earlier. See Coolant,
draining and filling (6-cylinder models).
WARNING-
Allow cooling system to cool before opening or draining sys-
tem.
- Remove cooling fan and fan shroud. See Mechanical (vis-
cous clutch) cooling fan, removing and installing.
- Remove coolant pump drive belt. See 020 Maintenance.
4 Remove coolant pump pulley bolts (arrows) and remove pul-
ley from pump.
- Remove nuts retaining pump to engine block.
NOTE-
The coolant pump is mounted on studs and retained by nuts.