engine BMW CONVERTIBLE 1998 Service Manual

12 6
a
Continuous exposure to used oil
has caused cancer in laboratory testing.
Any skin areas that come in contact with
oil should be thoroughly washed with
soap and water.
Always store oil, grease, etc., out of
reach of children. Observe all warning
labels and information on lubricant
containers.
If you use SAE 15W-40 engine oil in low
temperatures below 145F (-10 6) the
engine may become difficult to start.c
*Special engine oils individually
approved by BMW are the most suited
to your engine. Please contact your
BMW Retailer for details..Engine oil
Special - Oils* most preferable
15W - 40
5W - 30
30
20
10
0
-10
-20
-30-20 0 20 40 60 80 °C°F
APISERVICESG
ENERGYCONSERVINGII
SAE
5W-30
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12 7
At a glanceControlsCar careRepairsTechnicalDataIndex
Coolant level with engine cold: up to
the KALT/COLD mark on the transpar-
ent coolant expansion tank.
The coolant is a mixture of water and
extended-duty antifreeze with corrosion
inhibitor. Always maintain the prescribed
all-season 50:50 mixture ratio for year-
round protection against internal corro-
sion. No other additives are required.
Replace the coolant every three years.
To add coolantWait until the engine cools before re-
moving the cap from the expansion
tank. Before unscrewing the cap, en-
sure that the needle on the temperature
gauge is in the blue sector to avoid
scalding.
dStart by turning the cap counter-
clockwise. Pause to allow any accu-
mulated pressure to escape, then
open.
dAdd coolant up to the KALT/COLD
mark. Excess coolant drains off
through the overßow line.a
Do not add coolant while the
engine is hot.
To avoid the possibility of damage later
on, never use anything other than
factory-approved nitrite and amino-free
long-term antifreeze and corrosion
protectant. Your authorized BMW
Retailer is familiar with the official
specifications.
Antifreeze with corrosion protectant is
toxic. Always store in original contain-
ers only, keeping them tightly closed.
Store well out of reach of children.
When disposing of it, observe the
applicable environmental protection
laws.Long-term antifreeze and corrosion
protectant contains the flammable
substance ethylene glycol. You should
therefore avoid spilling it on hot engine
components, as it could catch fire and
cause serious burns.c
A
Observe the applicable environ-
mental protection laws when disposing
of used antifreeze.c
360de099Coolant

12 8
Warning lamp for brake hydraulic sys-
tem lights up:
Brake fluid loss resulting in extended
pedal travel.
Fill up to the upper mark (MAX, level
visible from the outside).
Any BMW Retailer can provide you with
information on factory-approved brake
fluids (DOT 4).
a
Brake fluid is hygroscopic, i.e., it
absorbs moisture from the atmosphere
over the course of time. To ensure that
your brake system continues to operate
at maximum efficiency, we strongly rec-
ommend that you have the brake fluid
changed at a BMW Retailer every two
years (refer to pages 71, 105 and 138
and to Service and Warranty Information booklet). Brake fluid is toxic, and also at-
tacks vehicle paintwork. Always store in
the original containers, and keep them
tightly closed, out of reach of children.
When disposing of it, observe the appli-
cable environmental protection laws. Do
not spill brake fluid and do not fill be-
yond the MAX graduation on the reser-
voir. Should it come into contact with
hot engine components, the brake fluid
could catch fire and cause serious
burns.c
A
Please observe the applicable envi-
ronmental protection laws when dis-
posing of used brake fluid.cWith the engine off, unscrew the reser-
voir cap, then reinsert it.
The fluid level should be in between the
graduations on the dipstick.
Use ATF to top up as required. Your
BMW Service representative can pro-
vide you with the fluid specifications.
Start the engine. Pour in more fluid as
required, continuing until it reaches to
between the two marks.
Switch off the engine. The fluid may rise
to about 0.2 inches (5 mm) above the
upper mark.
Screw the reservoir cap back on.
b
BMW 318i, 318is: Please contact
your BMW Retailer for the required
work.c
MAXMIN
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360de097
Brake fluid Power steering fluid

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High steering effort:
Check oil level, refer to previous page.
High steering effort during sudden tran-
sitions:
Please contact your BMW Retailer for
an immediate inspection.a
If the power steering fails, in-
creased effort will be required to steer
the vehicle.c
In the engine compartment on the right-
hand side of the heater partition panel
(arrow).
The information on the type plate and
the Vehicle Identification Number must
match those contained in the vehicle
papers.
These data are essential for processing
inquiries, expediting service procedures
and when ordering replacement parts.
360de310
Power steering fluid Vehicle Identification Number

13 0
The BMW Maintenance System has
been designed as a reliable means of
providing the customer with maximum
vehicle safety and reliability with mini-
mum complication and expense.
Please remember that regular periodic
maintenance plays an essential part in
ensuring continued vehicle security. It
also helps maintain the resale value of
the vehicle.
Service Interval DisplayAdvanced technology is employed to
calculate the optimal maintenance
intervals, which are then indicated in
the Service Interval Display. While con-
ventional maintenance systems rely on
mileage alone to determine when ser-
vice is due, the BMW Maintenance Sys-
tem reflects the actual conditions under
which the vehicle is operated, because
mileage is not simply mileage:
From the point of view of maintenance,
62,000 miles (100,000 km) accumulated
in short-distance driving are not the
equivalent of the same distance cov-
ered in long-distance highway travel.
The BMW Maintenance System
includes the Engine Oil Service as well
as Inspections I and II.
Determining the maintenance intervals
according to the actual loads on the car
covers every kind of operating situation.
However, drivers who cover only
extremely short distances - substantially
less than 6,200 miles (10,000 km) annu-
ally - should have the engine oil changed
at least once a year, as it continues to
age whether or not the car is used on a
regular basis.
Service and Warranty Information
bookletPlease refer to the Service and War-
ranty Information booklet for additional
information on maintenance intervals
and procedures.
Depending on operating conditions, as
a precaution against rust it may be a
good idea to have the body checked for
stone damage and chips at the same
time.
Please ensure that all maintenance
operations are entered in the Service
and Warranty Information booklet upon
completion. These entries will consti-
tute your proof that the vehicle has
received regular maintenance. They
are also required for warranty claims.b
Have your BMW Retailer carry out
the maintenance and repair. Your BMW
Retailer is always informed on the latest
maintenance work and repair tech-
niques and equipped with the required
special tools. In addition, the testing of
parts known from experience to be sub-
ject to wear is a permanent part of the
maintenance specifications.c
360us009The BMW Maintenance System

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At a glanceControlsCar careRepairsTechnicalDataIndex
Never use spot remover, paint thinner,
solvents, gasoline etc. to remove spots
from the convertible top and from the
rear window, as these substances
destroy the rubber seals and lead to
leaks. Use only BMW-approved clean-
ers.
In addition to the advantage of being
extremely flexible, the rear window also
has the disadvantage of having a rela-
tively soft surface. For this reason, only
clean the rear window with a soft, anti-
static cloth or with BMW Convertible
Rear Window Cleaner.
If you wash the vehicle frequently in
brush car washes, and in particular in
those with hard brushes, faint scratches
in the rear window may result. With the
window replacement system you can
replace a heavily scratched window at a
relatively low price. Please contact your
authorized BMW Retailer for additional
information. b
A full range of car-care products is
available from your BMW Retailer.c
a
Cleaning agents can contain sub-
stances that are dangerous or bad for
your health. Therefore always observe
the warnings and danger notices on the
package.
Open the doors or windows on your ve-
hicle when cleaning the interior.
Never clean your vehicle with solvents
or other materials not specifically in-
tended for this application.c
Hardtop:Please follow the instructions for car
care from page 131.If the vehicle is to be temporarily stored
for more than three months, have the
following maintenance performed by
your BMW Retailer:
1 Cleaning, preservation and retreat-
ment of the engine, engine compart-
ment, underbody, axles and
subassemblies in accordance with
the factory speciÞcations. Vehicle
washing with interior cleaning fol-
lowed by paint and chrome care.
Clean rubber seals of the hood, lug-
gage compartment lid and doors and
rub with either talcum powder or
glycerine oil.
2 Change engine oil and oil Þlter at
operating temperature. As an addi-
tional corrosion protection measure,
an anti-corrosive agent can be added
to the engine in accordance with the
manufacturer's instructions.
3 Check the coolant level and concen-
tration and top up if necessary.
4 Check the acid level in the battery
cells and add distilled water if neces-
sary.
5 Increase the tire inßation pressure to
50.9 psi (3.5 bar).
Cleaning and care of the convertible top Vehicle storage

14 6
a
Change tires only on a flat, hard
surface affording good traction. Avoid
jacking the car on a soft or slippery sup-
port surface (snow, ice, loose gravel,
etc.), as it could slide sideways.
Take extra care to ensure that the base
of the jack is positioned on a solid sup-
port surface.
Never use wooden blocks or similar
objects to support the base of the jack,
as the weight of the car could exceed
their support capacity.
Never lie beneath the vehicle or start
the engine while the car is supported by
the jack - risk of fatal injury.
Additional precautions to observe when
changing flat tires:
When pulling over on the roadside to
change a tire, always try to park the car
as far as possible from passing traffic.
Switch on the hazard flashers.
All passengers should be outside the
car and well away from your immediate
working area (e.g., behind the guard-
rail).Turn the steering wheel to the straight-
ahead position, remove the key and
engage the steering lock. Shift into 1st
or reverse (selector lever in Park with
automatic) and engage the parking
brake.
If a warning triangle or portable hazard
warning lamp is available, set it up on
the roadside at an appropriate distance
from the rear of the vehicle. Observe all
safety guidelines and regulations.c
b
To avoid rattling noises, note the
positions of the tools and return them to
their original positions.c
To change the tire you will need
Car jackIn the luggage compartment below the
floor mat at the right next to the spare
tire.
After using, screw the jack all the way
back down and insert it in its holder.Spare wheel and hexagon
adapter
*
Both are stored in the luggage com-
partment below the floor mat. Take out
the floor mat. Remove the hexagon
adapter (only on models with light-alloy
wheels with wheel lug cover in the
shape of a large hexagon nut), unscrew
the wing nut by hand and remove the
wheel.Wheel stud wrench In the luggage compartment at the right
on the box. ScrewdriverIn onboard tool kit beneath luggage
compartment floor panel.b
The storage shelf in the spare tire
can be used to store small parts. To
avoid rattling noises, you can place
cloths between them.c
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Changing tires

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The battery is located behind the right-
side trim panel in the luggage compart-
ment. A separate positive terminal in
the engine compartment is available for
jump-starting (also refer to page 153).
Only certain battery types may be used
on the BMW convertible. Consult your
BMW Retailer for details.
The battery is maintenance-free, mean-
ing that the electrolyte will normally last
for the life of the battery.
Should the electrolyte drop to below
the minimum level - e.g., during extend-
ed operation in hot climates - add dis-
tilled water (no acid!).
Electrolyte level: Up to the "MAX" mark
on the outside of the battery in each
cell, approx. 0.2 inches (5 mm) above
the top of the plates.
Keep the top of the battery clean and
dry.
SymbolsYou will find the following symbols on
your car battery. To avoid injury, please
observe the corresponding precautions
whenever you work with or near the
battery.

360de125
Before working with the battery,
read the following:
R
Wear eye protection. Avoid let-
ting acid or lead particles come
into contact with your eyes, your
skin or your clothing.
S
Battery acid is extremely corro-
sive. Wear eye protection and
protective gloves. Do not tilt the
battery; acid could emerge from the
ventilation openings.
T
Ensure that children keep well
away from batteries and battery
acid.
U
Never allow sparks or open
ßame, and do not smoke in the
vicinity of the battery. Avoid
sparks from electrical cables and
equipment. Never short-circuit the bat-
tery terminals. There is a danger of
injury from powerful sparks.
V
A highly-explosive gas is gener-
ated when the battery is
charged.
W
If you happen to get acid in your
eyes, rinse thoroughly for sev-
eral minutes with clear water.
Then consult a physician immediately. If
you get acid spray on your skin or cloth-
ing, apply soap immediately to neutral-
ize the acid, then rinse with plenty of
water. If electrolyte is accidentally
ingested, consult a physician immedi-
ately.
X
To protect the casing against
ultraviolet radiation, avoid
exposing it to direct sunlight.
A discharged battery can freeze; always
store the battery in areas where the
temperature remains above freezing.
Battery

15 0
Removal and installationa
Do not disconnect the battery
cable from its terminal while the engine
is running, as the resulting voltage surge
would destroy the vehicle's electronic
systems.c
When disconnecting, start with the neg-
ative terminal, then proceed to the pos-
itive side. Unscrew the battery retaining
clamp.
When installing the battery, connect the
positive terminal first, then proceed to
the negative pole.
a
When installing, always ensure that
the battery is properly mounted.
Otherwise it will not be sufficiently
secured in an accident.c
Charging the battery Always ensure that the engine is off
before recharging an installed battery. a
To avoid short circuits, always
disconnect the cable from the battery's
negative terminal before working on the
electrical system.cOn vehicles with a connecting point in
the engine compartment, it is easiest to
charge the battery by using this con-
necting point (positive pole), and a
ground in the engine compartment
(refer to "Jump-starting" on page 15 3).
If you are planning to remove the vehi-
cle from service for more than four
weeks, you should disconnect the bat-
tery at the negative terminal.
If you intend to store your car for longer
than six weeks: remove the battery,
charge it and store it in a cool (but frost-
free) room. Recharge the battery after
three months at the latest, as it will oth-
erwise be damaged beyond use. Every
time the battery is discharged, espe-
cially over extended periods, its service
life is reduced.
A
Bring used batteries to an autho-
rized collection point or a BMW Re-
tailer. Always maintain the battery in an
upright position for transport and stor-
age. Secure the battery against tilting
when transporting.c
a
Storage periods during which the
battery is disconnected are not taken
into consideration by the Service Inter-
val Display for changing the brake fluid.
Therefore, make sure that the brake fluid
is changed every two years at the latest,
regardless of the display. Additional
notes: refer to page 128.c
Battery

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If an electrical device fails, switch it off
and check the fuse.
The fuse box (electrical distribution
center) with spare fuses, relays and
plastic tweezers, is located on the left-
hand side of the engine compartment.
dPress the retaining flap in and lift off
the cover.
dRemove the fuse of the defective
consumer from the socket with the
plastic tweezers.
dIf the fuse is burned through (the
metal wire will have melted and sep-
arated), replace it with a new fuse of
the same ampere rating.A list of the fuses with their respective
ampere ratings and the equipment in
their circuits is provided in the fuse box
lid.
a
Do not patch burned out fuses or
replace them with fuses of a different
color or ampere rating, since this could
cause an overload on an electrical wire
and lead to fire in the vehicle.c
If the fuse continues to burn through,
refer the problem to a BMW Retailer for
repair.
360de102Fuses