torque MERCEDES-BENZ C320 4MATIC 2003 W203 Owner's Manual

244 OperationTires and wheelsKeep this in mind when checking tire pres-
sure where the temperature is different
from the outside temperature.
Tire temperature and tire pressure are also
increased while driving, depending on the
driving speed and the tire load.
Check the spare tire periodically for condi-
tion and inflation. Spare tires will age and
b e c o m e w o r n o v e r t i m e e v e n i f n e v e r u s e d ,
and thus should be inspected and replaced
when necessary.
Rotating wheels
On vehicles with the same wheel size all
around, wheels can be rotated every 3 000
to 6 000 miles (5 000 to 10 000 km), or
sooner if necessary, according to the de-
gree of tire wear. The same direction of tire
rotation must be retained.Rotate the wheels before the characteris-
tic tire wear pattern becomes visible
(shoulder wear on front wheels and tread
center wear on rear wheels).
Thoroughly clean the inner side of the
wheels after each rotation. Check and en-
sure proper tire inflation pressure.
Warning!
G
Follow recommended inflation pressures.
Do not overinflate tires. Overinflated tires
can result in sudden deflation (blowout) be-
cause they are more likely to become punc-
tured or damaged by road debris, potholes,
etc.
Do not underinflate tires. Underinflated tires
wear unevenly, adversely affect handling
and fuel economy, and are more likely to fail
from being overheated.
Do not overload the tires by exceeding the
specified vehicle capacity weight (as indicat-
ed by the label on the pillar in the driver’s
door opening). Overloading the tires can
overheat them, possibly causing a blowout.Warning!
G
Rotate front and rear wheels only if they are
of the same size.
Warning!
G
Have the tightening torque checked after
changing a wheel. Wheels could become
loose if not tightened with a torque of
80 ft.lb. (110 Nm).
Use only genuine Mercedes-Benz wheel
bolts specified for your vehicle's rims.

301 Practical hints
Flat tire
In the case of a flat tire, you may
temporarily use the Minispare wheel when
observing the following restrictions:

Do not exceed vehicle speed of 50 mph
(80 km/h).


Drive to the nearest tire repair facility
to have the flat tire repaired or
replaced as appropriate.


Do not operate vehicle with more than
one spare wheel mounted.Lowering the vehicle

Lower vehicle by turning crank
counterclockwise until vehicle is
resting fully on its own weight.

Remove the jack.
1-5 Wheel bolts

Tighten the five wheel bolts evenly,
following the diagonal sequence
illustrated (1to5), until all bolts are
tight. Observe a tightening torque
of 80 ft lb (110 Nm).

Before storing the jack in the trunk, it
should be fully collapsed, with handle
folded in (storage position)
(page 280).
Warning!
G
Have the tightening torque checked after
changing a wheel. The wheels could come
loose if they are not tightened to a torque
of 80 ft lb (110 Nm).

320 Technical dataEngine
EngineModel
C 230 Kompressor Sport (203.040)
1
1The quoted data apply only to the standard vehicle. See an authorized Mercedes-Benz Center for the corresponding data of all special bodies and
special equipment.
C 240 (203.061)
1
C 240 4MATIC (203.081)
1
Engine
271
112
Mode of operation
4-stroke engine, gasoline injection
4-stroke engine, gasoline injection
No. of cylinders
4
6
Bore
3.23 in (82.00 mm)
3.54 in (89.90 mm)
Stroke
3.35 in (85.00 mm)
2.68 in (68.20 mm)
Total piston displacement
109.6 cu.in. (1 796 cm
3)
158.5cu.in. (2597cm
3)
Compression ratio
8.5:1
10.5:1
Output acc. to SAE J 1349
189 hp / 5 800 rpm
(141 kW / 5 800 rpm)
167 hp / 6 000 rpm
(125 kW / 6 000 rpm)
Maximum torque
acc. to SAE J 1349
192ft.lb/3500rpm
(260 Nm / 3 500 rpm)
177 ft.lb / 4 500 rpm
(240 Nm / 4 500 rpm)
Maximum engine speed
6000 rpm
6 200 rpm
Firing order
1-3-4-2
1-4-3-6-2-5
Poly-V-belt
7ft 11in (2420mm)
7 ft 10 in (2 390 mm)

321 Technical data
Engine
Model
C 320 (203.064)
1
C 320 4MATIC (203.084)
1
C 320 Sport (203.064)
1
C 320 4MATIC Sport (203.084)
1
C 32 AMG (203.065)
1
Engine
112
112
Mode of operation
4-stroke engine, gasoline injection
4-stroke engine, gasoline injection
No. of cylinders
6
6
Bore
3.54 in (89.90 mm)
3.54 in (89.90 mm)
Stroke
3.31 in (84.00 mm)
3.31 in (84.00 mm)
Total piston displacement
195.2cu.in. (3199cm
3)
195.2 cu.in. (3 199 cm
3)
Compression ratio
10:1
9:1
Output acc. to SAE J 1349
214 hp / 5 700 rpm
(160 kW / 5 700 rpm)
348 hp / 6 100 rpm
(260 kW / 6 100 rpm)
Maximum torque
acc. to SAE J 1349
229 ft.lb / 3 000 rpm
(310 Nm / 3 000 rpm)
333ft.lb/4400rpm
(450 Nm / 4 400 rpm)
Maximum engine speed
6000 rpm
6200 rpm
Firing order
1-4-3-6-2-5
1-4-3-6-2-5
Poly-V-belt
7ft 10in (2390mm)
9ft 6in (2902mm)
1The quoted data apply only to the standard vehicle. See an authorized Mercedes-Benz Center for the corresponding data of all special bodies and
special equipment.

326 Technical dataElectrical system
Electrical system
C230KompressorSport
C 240 / C 320 (all models)
C32AMG
Generator (alternator)
14 V/120 A
14 V/120 A
14 V/120 A
Starter motor
12 V/1.1 kW
12 V/1.7 kW
12 V/1.7 kW
Battery
12 V/100 Ah
12 V/100 Ah
12 V/100 Ah
Spark plugs
Bosch F 6 MPP 332
Bosch F 8 DPP332
NGK PFR 5 R-11
NGK IFR 6 D 10
Electrode gap
0.031 in (0.8 mm)
0.039 in (1.0 mm)
0.039 in (1.0 mm)
Tightening torque
18–22ft.lb (25–30Nm)
15 – 22 ft.lb (20 – 30 Nm)
15 – 22 ft.lb (20 – 30 Nm)

344 Technical termsPoly-V-belt drive
Drives engine-components (alternator,
AC compressor, etc.) from the engine.
Power train
Collective term designating all compo-
nents used to generate and transmit
motive power to the drive axles, includ-
ing


engine


clutch/torque converter


transmission


transfer case*


drive shaft


axle shafts/axles
Program mode selector switch
Used to switch the automatic transmis-
sion between standard operationS and
winter operationW.Remote Vehicle Diagnostics
Transmission of vehicle data and cur-
rent location to the Mercedes-Benz
Customer Assistance Center for sub-
scribers to Tele Aid service.
Restraint systems
Seat belts, belt tensioners, airbags and
child restraint systems. As indepen-
dent systems, their protective func-
tions complement one another.
RON
(R
esearch O
ctane N
umber)
The Research Octane Number for gaso-
line as determined by a standardized
method. It is an indication of a gaso-
line's ability to resist undesired detona-
tion (knocking). The average of both
the ->MON (Motor Octane Number)
and RON (Research Octane Number) is
posted at the pump, also known as
ANTI-KNOCK INDEX.Shift lock
When the vehicle is parked, this lock
prevents the transmission selector le-
ver from being moved out of positionP
without key turned and brake pedal
depressed.
SRS
(S
upplemental R
estraint S
ystem)
Seat belts, emergency tensioning de-
vice and airbags. Though independent
systems, they are closely interfaced to
provide effective occupant protection.

345 Technical terms
Tele Aid System
(T
elematic A
larm I
dentification on
D
emand)
The Tele Aid system consists of three
types of response: automatic and man-
ual emergency, roadside assistance
and information. Tele Aid is initially ac-
tivated by completing a subscriber
agreement and placing an acquain-
tance call.
The Tele Aid system is operational pro-
viding that the vehicle’s battery is
charged, properly connected, not dam-
aged and cellular and GPS coverage is
available.Telematics*
A combination of the terms “telecom-
munications” and “informatics”.
Tightening torque
Force times lever arm (e.g. a lug
wrench) with which threaded fasteners
such as wheel bolts are tightened.
Tire speed rating
Part of tire designation; indicates the
speed range for which a tire is ap-
proved.
Traction
Force exerted by the vehicle on the
road via the tires.VIN
(V
ehicle I
dentification N
umber)
The number set by the manufacturer
and placed on the body to uniquely
identify each vehicle produced.
Voice control system*
Voice control system for car phones,
portable cell phones and audio sys-
tems (radio, CD, etc.).

367 Index
Technical data 332
Brake fluid 332
Coolant 329
Coolants 336
Electrical system 326
Engine oil 332
Engine oil additives 332
Flexible fuel vehicles 334
Fuel requirements 333
Fuels 329
Gasoline additives 334
Lubricants 329
Main dimensions 327
Premium unleaded gasoline 333
Rims and tires 322
Weights 328
Windshield washer and headlamp
cleaning* system 331, 338
Tele Aid* 209
Emergency calls 211
Information 214
Initiating an emergency call
manually 212
Messages in display 277
Remote door unlock 216
Roadside assistance 213SOS button 212
Stolen vehicle tracking services 217
System self-check 210
Tele Aid System 210, 345
Upgrade signals 215
Telematics* 345
Telephone* 24, 208
Answering a call 135
Dialing a number from
the phone book 135
Emergency call 185
Ending a call 135
Hands-free microphone 27
Loading phone book* 135
Messages in display 277
Operation 134, 182
Redialing 136
Signal strength 134
Temperature
Display mode 123
Grades of tires 340
Setting interior
temperature 150, 158
Setting units in display 123
Tires 244Tightening torque
(Wheel bolts) 301, 345
Tilt
Head restraint 34
Time
Setting hours 122
Setting minutes 122
Time display
Setting 123
Tire inflation pressure
Checking 234, 243
Tire speed rating 227, 345
Tire traction 227
Tires 242, 322, 339
Consumer information 339
Direction of rotation 243
Driving instructions 226
Retreads 242
Rims and tires 322
Service life 243
Temperature 244
Temperature grades 340
Tread depth 245
Wear pattern 244
Winter 245
Tools 279

369 Index
Service battery 303
Towing 308
Unlocking 25
Unlocking in an emergency 285
With flexible fuel 334
Vehicle battery 303
Vehicle care 249
Cup holder 252
Engine cleaning 250
Gear selector lever 252
Hard plastic trim items 252
Headlamps 251
Instrument cluster 252
Leather upholstery 253
Light alloy wheels 252
MB Tex upholstery 253
Ornamental moldings 251
Paintwork 250
Plastic and rubber parts 252
Power washer 250
Seat belts 252
Steering wheel 252
Tail lamps 251
Tar stains 250
Turn signals 251Vehicle washing 251
Window cleaning 251
Wiper blades 251
Vehicle identification number (VIN) 318
Vehicle jack 280
Vehicle lighting
Checking 234
Vehicle tool kit 279
Alignment bolt 279
Removing 279
Spare fuses 279
Special fuse puller 279
Towing eye bolt 279
Vehicle jack 279
Wheel bolts 279
Wheel wrench 279
Vehicle washing 251
Ventilated storage compartment 155
Ventilation
Storage compartment 155
VIN (Vehicle Identification
Number) 318, 345
Voice control system* 345
Hands-free microphone 27W
Warning lamps
see Lamps, indicator and warning
Warning sounds
Drivers seat belts 61
Parking brake 46
Warranty coverage 317
Washer fluid see Windshield washer fluid
Washing the vehicle 249
Wear pattern (tires) 244
Weights 328
Wheel change
Tightening torque 301
Wheels
Rotating 244
Tires and wheels 242
Window curtain airbags 61
Windows see Side windows
Windshield
Defogging 151, 159
Refilling washer fluid 241
Replacing wiper blades 296
Washer fluid 241, 338
Washer system 338