2001 BMW 540i check transmission fluid

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170-5
Radiator and Cooling System
Fan switch calibration (M52, M62 engine)
coniprairoi OUt rlgnal
Auto. ciimilte ~ontioi inpuls via CAN bus
Electric fan activation:
Low speed
91°C (196°F)
High speed 104' C (21 9' F)
< In models manufactured after 911998 (M52 TU engine, M54
engine.
M62 TU engine), the electric cooling fan is controlled
by the engine control module (ECM) via the output final
stage.
The output final stage is mounted on the fan housing, next to
the fan motor. The fan is operated using a pulse width modu-
lated signal. Fan circuit wiring is protected by a 50-amp fuse.
Electric fan activation is based on the following inputs to the
ECM:
Radiator outlet temperature
Calculated catalytic converter temperature
Vehicle speed
* Battery voltage
Calculated
A/C pressure
When the vehicle is first started, the ECM activates the elec-
tric fan briefly at 20% of its maximum speed, then switches
off. This is for diagnostic monitoring. The voltage generated
by the fan when it slows down (acting as a generator) must
match the stored rpm values in the fan output stage toconfirm
that the fan is operating correctly.
NOTE-
If the ECM fault memory indicates a cooling fan fault, check
that the fan is not seized and that it spins freely.
When
A/C is switched ON, the electric fan is not immedi-
ately turned on.
After the engine is switched
OFF the fan may continue to
run at varying speeds for up to 10 minutes, based on cal-
culated catalyst temperature.
Transmission fluid heat exchanger
Automatic transmission fluid lines circulate transmission fluid
(ATF) to and from a heat exchanger at the radiator.
All 6-cylinder
models andV-8 models produced to 911998 are
equipped with a transmission cooler located in a cooling cas-
sette in front of the radiator.

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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).

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230 Manual Transmission
General ........................... .23 0.2 Output shaft
seal. replacing (5-speed
.... Special tools ........................ .23 0.2 transmission) (transmission installed) 230-10
Manual transmission aoolications ....... .23 0.5 Output shaft seal. replacing (6-speed . . .... transmission) (transmission installed) 230-12 ........ Transmission Fluid Service .23 0.6 put shaft seal. replacing
Transmission fluid level. checking ....... .23 0.6 (transmission ............... 230-15
........... Transmission fluid, replacing .23 0.6
Transmission Removal ................... ..... Transmission External Service .23 0-7 and installation 230-1
Back-up light switch, replacing .......... .23 0-' Transmission, removing and installing 230-16 ...
Selector shaft seal. reolacina .
(transmission installed) ................ .23 0.8

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230-6
Manual Transmission
Manual transmissions installed in the 5 Series are normally
filled with a "Lifetime" manual transmission fluid
(BMW MTF
LT-I) and do not require periodic fluid changes. Transmis-
sions filled with MTF LT-I lifetime oil are identified with a yel-
low label near the transmission fill plug labeled "Lifetime Oil
MTF-LT-1".
Transmission fluid level, checking
- Drive vehicle for a few miles to warm transmission.
- Raise and safely support vehicle to access transmission
filler plug.
CAUTION-
Make sure the car is stable and well supporfedat all times.
4 Remove side filler plug (B). Insert finger into hole to check
fluid level. If fluid level is up to bottom of filler hole (finger is
wetted by transmission fluid), level is correct.
NOTE-
* Check and fill transmission with car on level surface.
5-speed transmission shown in illustration. 6-speed trans-
mission is similar.
- Install and torque filler plug.
Tightening torque
Transmission drain or fill
plug
to transmission case SO Nm (37 it-lb)
Transmission fluid, replacing
- Drive vehicle for a few miles to warm transmission.
- Raise and safely support vehicle to access drain plug.
CAUTION-
Make sure the car is stable and well supported at all times.
Use a professional automotive lift
orjack stands designed
for the purpose.
A floor jack is not adequate support.
Check that the
fill plug is not seizedprior to draining
transmission fluid.

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230-9
Manual ~ransmissionl
Carefully pry out selector shaft oil seal with BMW special tool
23
0 210, or with a narrow seal remover or small screwdriver.
Coat new selector shaft seal with transmission fluid. Drive
new seal in flush with housing. Use
BMW special seal instal-
lation tool
23 0 220 or equivalent and a soft-faced (plastic)
hammer.
- Remainder of installation is reverse of removal, noting the fol-
lowing:
Install driveshaft using new
loclc nuts.
Check transmission oil level, topping up as necessary.
Tightening torques Aluminum driveshaft to flex-disc
. MI2 (use Dacromet-coated washers) 90 Nm (66 ft-lb)
Driveshaft CV joint to final drive flange
MI 0 (Torx bolt) 70
Nm (51 ft-lb)
M8 (compression nut) 32
Nm (24 ft-lb)
Flex-disc to transmission flange or driveshaft
MI0 (8.8 grade) 48 Nm (35 ft-lb)
MI0 (10.9 grade) 60
Nm (44 it-lb)
MI2 (8.8 grade) 81
Nm (60 ft-lb)
MI2 (10.9 grade) lo0 Nm (74 ft-lb)
- MI4 140 Nm (103 ft-lb)
Transmission crossmember
to transmission (ME) 21 Nm (15 ft-lb)
. to chassis (M10) 42 Nm (30 ft-lb)

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230-1 1
Manual ~ransmissionl
Coat new seal with transmission fluid. Use seal installation
drift (see table below) to drive seal into position until it is flush
with housing.
Output seal drives
Transmission
BMW special tool
Getrag S5D 250G 240110
ZF S5D 3202 23 2 300
inspect sealing surface on output flange. Replace if flange
surface is worn or damaged.
Heat output flange to about 176"
F (80" C) to aid in installa-
tion. This can be done by placing flange in hot water. Rein-
stall output flange to output shaft.
- Coat flange nut with LoctiteB243 and reinstall. Torque in two
stages.
Tightening torques Output flange to output shaft
Stage I 190 Nm (140 ft-lb)
Stage II (after loosening) 120
Nm (89 ft-lb)
- Remainder of installation is reverse of removal, noting the fol-
lowing:
Install driveshaft using new nuts. See
260 Driveshaft.
Check transmission fluid level, topping up as necessary
Tightening torques Aluminum driveshaft to flex-disc
- MI2 (use Dacromet-coated washers) 90 Nm (66 ft-lb)
Driveshaft
CV joint to final drive flange
. MI0 (Torx bolt) 70
Nm (51 ft-lb)
. M8 (compression nut) 32
Nm (24 ft-lb)
Flex-disc to transmission flange or driveshaft
- MI0 (8.8 grade) 48
Nm (35 ft-lb)
- MI0 (10.9 grade) 60
Nm (44 It-lb)
. MI2 (8.8 grade) 81 Nm (60 ft-lb)
. MI2 (10.9 grade) I00 Nm (74 It-lb)
M14 140 Nm (103 It-lb)
Transmission crossmember
- to transmission (ME) 21 Nm (15 It-lb)
- to chassis (M10) 42 Nm (30 It-lb)

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240 Automatic Transmission
General . . . . . . . . . . . . . . . . . . . . . .
Special tools . . . . . . . . . . . . . . . . . . .
Automatic transmission applications
. . . . . ,240-2 ATF, draining and filling . . . . . . . . . . . . . . . . 240-7
. . . . . ,240-2 Automatic transmission fluid
. . . . . ,240-4 pan and strainer. . . . . . . . . . . . . . . . . . . . . . 240-9
Troubleshooting . . . . . . . . . . . . . . . . . . .240-4 Transmission Removal
and Installation
. . . . . . . . . . . . . . . . . . . 240-10 Automatic Transmission Fluid Transmission, removing and installing . . . 240-10 (ATF) Service . . . . . . . . . . . . . . . . . . . . . ,240-6
Automatic transmission fluid (ATF) . . . . . . . ,240-6
ATF level, checking . . . . . . . . . . . . . . . . . . ,240-6

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- .- -
Automatic Transmission
Electronics are used to control the operation of these auto-
matic transmissions. Steptronic transmission functions are
also programmed into the transmission control module
(TCM). The TCM monitors transmission operation for faults
and alerts the driver by illuminating the transmission fault indi-
cator on the instrument panel. Diagnostic trouble codes
(DTCs) stored in the TCM may be downloaded and interpret-
ed by trained technicians using special BMW diagnostic
equipment.
Some minor automatic transmission problems can be cor-
rected by changing the automatic transmission fluid (ATF)
and filter. Begin by checking ATF level and condition.
Checlc
to see if the fluid is dirty or has a burned odor indicating over-
heated fluid. The burned odor may be the results of burned
discs in theclutch paclts. The friction material from the burned
disc can clog valve body passages.
NOTE-
The E39 automatic transmission is not equipped with a dip-
stick.
Checking the ATF level must be done while monitoring
the ATF temperature with the engine idling. The
BMW dealer
is equipped with the special equipment to make this check.