1998 BMW 528i coolant pump

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.," --
Radiator and Cooling System --- 1
insert two M6 screws (arrows) in tapped bores and tighten
uniformly until pump is free from timing chain cover (thermo-
stat and hoses have been removed for purposes of visual
clarity).
Installation is reverse of removal, noting the following:
Be sure to replace sealing O-ring and gaskets.
Coat O-ring with water-based lubricant during installation.
Refill with coolant. See Coolant, draining and filling
(6-
cylinder models).
Tightening torques
-
Coolant pump to timing chain 10 Nm (89 in-lb)
cover
Coolant pump pulley to coolant
10 Nm (89 in-lb
pump
Engine block drain plug to block 25 Nm (1 8 It-lb)
Radiator drain plug to radiator 2 - 3 Nm (I8 - 27 in-lb)
Coolant pump, replacing (V-8 models)
I 1 < The engine coolant pump is mounted in the front of the en-
gine in ;he timing chain cover.
1. Thermostat housing
2. Thermostat
3. Thermostat sealing O-ring
4. Water pump
5. Water pump gasket
- Drain cooling system. See Coolant, draining and filling (V-
8 models).
- Remove cooling fan and fan shroud. See Mechanical (vis-
cous clutch) cooling fan, removing and installing.
- Remove engine drive belts: See 020 Maintenance.
NOTE-
Mark direction of drive belt rotation if reusing belt,
- Remove vibration dampener. See 117 Camshaft and Tim-
ing Chain.
- Disconnect mass air flow (MAF) sensor electrical harness
connector. Remove air intake duct together with
MAF sensor.
- Disconnect coolant hoses from thermostat housing and cool-
ant pump housing.

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Radiator and Coolina ~vsteml
- Disconnect thermostat and cooling system temperature sen-
sor plug connectors.
4 Remove thermostat housing fasteners and remove housing.
- Remove coolant pump pulley bolts and remove pulley from
pump.
Remove fasteners A and B (arrows).
NOTE-
* The coolant pump is retained to the block using different
length bolts.
0 Bolts A: M6 X 105 mm
0 Bolts 8: M6 X 35 mm
Slide coolant pump away from coolant pipes (arrows) while
being careful not to dislodge pipes from fittings at rear of en-
gine.
- Installation is reverse of removal, noting the following:
Replace all sealing O-rings and washers.
Coat O-rings with water-based lubricant during installation.
Fill system with coolant. See Coolant, draining and fill-
ing (6-cylinder models) or Coolant, draining and filling
(V-8 models).

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.. - --
Radiator and Cooling System
Tightening torques
Coolant pump to timing chain 10
Nm (89 in-lb)
cover
Coolant pump
pulley to coolant
pump
10 Nm (89 in-lb
Engine
blocic drain plug to block 25 Nm (18 ft-lb)
Radiator drain plug to radiator
2-3Nm(18-27in-lb)
Thermostat cover to coolant
pump assembly 10 Nm (89 in-lb)
Radiator, removing and installing
Removal of the radiator is similar for V-8 and 6-cylinder mod-
els.
- Raise front of car and support safely.
WARNING -
Make sure the car is stable and well supported at aN times.
Use a professional automotive liff
orjaclc stands designed for
- Remove splash shield from under engine.
- Drain radiator and engine block. See Coolant, draining and
filling
(V-8 models).
WARNING -
Allow cooling system to cool before opening or draining sys-
tem.
< Remove air filter housing:
Disconnect electrical harness connectors
(A and B).
Loosen clamps (C and D).
Remove mounting fastener (arrow) and remove air filter
housing together with mass air flow
(MAF) sensor.

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. --
Radiator and Cooling system/
4 Pry out expansion rivets (A) on left and right side of fan
shroud. Loosen hose clamp
(6) and remove hose from ex-
pansion tank.
Remove expansion tank: Remove expansion tanlc cap, vent plug
(A) and tank retain-
ing clips (arrows).
Lift expansion
tanlc upward and off lower retaining lugs.
Push shroud back to expose expansion tank vent line. Re-
move line.
Using 32 mm wrench
(BMW special tool 11 5 040) on fan
clutch nut (arrow), turn wrench in a clockwise direction
(working from front of car) while counterholding pulley with
BMW special tool 11 5 030. Spin fan off coolant pump.
NOTE-
The radiator cooling fan nut (32 mrn wrench) has left-hand
threads.
Disconnect electrical harnesses from
AUC (air quality) sen-
sor and coolant level sensor.

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INDEX 'tl
WARNING
Your common sense, good
judgemenl, and general alertness are
crucial to sale and successiul service
worlr. Belore attempting any work on
your
BMM be sure lo read 001
General Warnings and Cautions
and the
copyriglll page at the front 01
the manual. Review these warnings
and
caulions each lime you prepare
lo work on your BMW. Please also
read any warnings and cautions that
accompany
tile procedures in the
manual.
312-way valve (running losses)
see Fuel tank
Abbreviations, commonly used 600-14
ABS (antilock brake system)
see
Bral(es
A/C air distribution motors
see stepper motors (below)
blower final stage (resistor pack),
replacing
640-16
blower, removinglinslalling
640-1 5
compressor, replacing
640-24 condenser, replacing 64045
control panellmodule, removing1
installing
640-1 1
evaporakr, removinglinstalling 640-29
evaporator temperature sensor
640-12 expansion valve, removinglinstailing
640-27
IHKA/ IHKR system description 640-5
receiveridrier, replacing 640-26
stepper motors 640-1 3 ventilation microiilter, replacing
020-22. 640-17
see also Heating
Accelerator
iinlcage
see Maintenance
Activated carbon canister
see Fuel tank
ADS (auxiliary throttle valve)
130-57
Air compressor
330-44
Air conditioning
see
AIC
Air distribution (flap) motors
seeNC, stepper motors
Air filter see Maintenance
Air spring
300-6, 330-12
Airbag system (SRS)
2-stage
airbag 721-4
control module, replacing 721-7 driver airbag, removinglinstalling
721-8
iiead protection airbag 721-12 components 721-1 1
indicator
lighl721-4
passenger airbag, removinglinstalling
721-9 side-impact airbags crash sensor,
replacing
721-7
Airflow sensor see 130 under appropriate
fuel
injection system
Air pump
see 130 under appropriate fuel
injection system, secondary air
injection system
Air suspension
see Electronic height control
(EHC)
Alarm
see Anti-theft alarm
Alignment see
Wheei alignment
Aluminum suspension components
300-2
Antenna 650-6
Alternator see Battery, starter, alte rnator
Amplifier
650-4
Anti-theft alarm (DWA)
515-24 emergency disarming 515-31
Antifreeze (engine coolant)
see Maintenance
see also Cooling system
Antilock brake system (ABS) see Brakes
ASC see Brakes
ATF (automatic transmission fluid)
see Automatic transmission
see also Cooling systern
Automatic headlight adjustmenl
(LWR) see Lights
Automatic seat belt tensioner
720-4
Automatic shiftloclc
see
Gearshift
Automatic transmission
applications
200-3, 240-4
ATF 020-10, 200-4
capacity 240-8 checking 240-6
drainingifilling 240-7
heat exchanger 170-5
fluid pan and strainer 240-9 gearshift
see Gearshift
ID tag
200-3 range switch 610-6
removaliinstallation 240-10
steptronic see Gearshift
Auxiliary cooling fan
see
Coollng system, electric Ian
Auxiliary throttle valve (ADS)
130-57
Axle joint
see Drive axle
Back-up light switch
automatic transmission see Automatic transmission. range switch
- .~.~~~
manual transmission 230-8 -
- I

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WARNING
Your common sense, good
judgement, and general alertness are
crucial lo sale and
successlul service
work. Belore attempling any work on
your BMW, be sure to read 001
General Warnings and Cautions
and lhe copyright page
a1 llle Iron1 01
the manual. Review lliese warnings
and cautions each time you prepare
lo work on your
BMW Please also
read any warnings and
caulions lhal
accompany the procedures In !he
manual.
Component locations
see Electrical system
Compression test
113-5
Compressor see
AlC
Condenser see
AlC
Constant velocity (CV) joint
see Maintenance
see also
Driveshall
see also Drive axles
Consumer cutoff
600-10
Control arm see Front suspension
see also Rear suspension,
suspension arms
Coolant (antifreeze) see Maintenance
see also Cooling system
Coolant pump
see Cooling system Cooling system
coolant bleeding
170-14 6-cylinder engine, draininglfilling
170-10
V-8 engine, draininglfilling 170-12
coolant pump 170-3
6-cyiinder engine, replacing 170-1 9
V-8 engine, replacing 170-20 cooling fan 170-4
viscous ciutch fan, removingi
installing 170-14
electric fan, removlngiinstailing 170-1 5
expansion tank, removinglinstalling
170-22
electrically heated (ciiaracterislic
map) therrnostat 170-4
radiator, removinglinstaliing 170-22
service
see Maintenance
therrnostat 170-16
transmission fluid heat exchanger
170-5 troubleshooting 170-7
combuslion leal( test 170-10
pressure test
170-9
Crankshaft oil seals
iront
117-6
rear 11 9-6
Crankshaft speed sensor
see Ignition syslem
Crash sensor
see
Airbag system (SRS), side-impact
airbag crasii sensor
Cruise control clutch switch 612-9
CV joint
see Maintenance
see also Driveshalt
see also Drive axles
CV joint boot
see Maintenance
see also Drive axles
Cylinder head removinglinslaliing
M52 engine 113-8
M52 TU / M54 engine 113-22
M62 engine 113-56
Cylinder head and valvetrain
hydraulic lifters, checking and
replacing
116-7 leak test 116-5 valves 11 6-56
see
alsocylinder head Dashboard
513-7
Deck
lid
seeTrunk lid
Diagnostic monitors
OED-4
Diagnostic trouble codes
(DTCs)
080-7
Digital multimetel
010-17
Differential see Final drive
DLC (data
link connector) 020-4, OED-4
DME (digital motor electronics)
see
130 under appropriate fuel
injection system
see also ignition system
DM-TL (detection module-tank leak)
see
Fuel lank, leak deteclion unit
Drive
belts
see Maintenance
Dome light
seeLighls, interior lights
Door
door
check, replacing 411-4
hinge adjustment 41 1-5
loci(
see Door lock see also Central locking
removinglinslaliing 41
1-2
panel, removinglinstaliing 41 1-7 window
see Door window
Door
check
see Door
Door
handle
see Door lock
Door glass
see Door window
Door
lock
handles and loci(s 515-16
see also Central locking
Door
molding
510-13
Door panel see Door

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112 INDEX
Warnings 001-1
Warnings, cautions and notes
01
0-3
Washer fluid pump
see Wipers and washers
Washers see Wipers and washers
Washing see Maintenance
Water pump
see Cooling system, coolant
pump
Waxing
see Mainienance
Wheel, steering
see Steering
Wheel alignment
320-33 ride [height 300-14
see also Maintenance
Wheel bearing
see Front suspension
see also Rear suspension
Wheels
300-1 1
Window motor see Door window
Window regulator
see Door window
Window switch
512-3
see Switches
Windows, door
see Door window
Windshield wipers and washers
see Wipers and washers
see also Maintenance
Wiper motor
see Wipers and washers Wipers and
washers
rain sensor 61
1-6 rear window (Sport Wagon) wiper motor, removingiinstaiiing
611-15 wiper shaft, removing.instaiiing
611-15
wiperiwasher system 61
1-8 washer system 611-16
wiper
assembly 611-12
wiper blades and arms 61 1-9
Wiring codes and abbreviations
600-12
Wirinq diaarams ELF-I -
see also Electrical system
Working under car safely
010-6
Xenon headlght
630-6
ZKE (central body electronics)
600-8