2004 MERCEDES-BENZ C CLASS COUPE torque

246 OperationTires and wheelsTire pressure changes by approximately
1.5 psi (0.1 bar) per 18°F (10°C) of air
temperature change. Keep this in mind
when checking tire pressure 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 3000
to 6000 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. Overinflating 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 lb-ft (110 Nm).
Use only genuine Mercedes-Benz wheel
bolts specified for your vehicle's rims.

306 Practical hintsFlat tireLowering the vehicle
Lower vehicle by turning crank coun-
terclockwise until vehicle is resting ful-
ly on its own weight.

Remove the jack.
1 -5 Wheel bolts

Tighten the five wheel bolts evenly, fol-
lowing the diagonal sequence
illustrated ( 1 to 5 ), until all bolts are
tight. Observe a tightening torque of
80 lb-ft (110 Nm).

Before storing the jack in the trunk, it
should be fully collapsed, with handle
folded in.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 lb-ft (110 Nm).

324 Technical dataEngine
EngineModel
C 230 Kompressor (203.740)
1
1The quoted data apply only to the standard vehicle. See an authorized Mercedes-Benz Center for the corresponding data of all sp ecial bodies and special equipment.
C 320 (203.764)
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)
3.3 in (84.00 mm)
Total piston displacement
109.6 cu in (1796 cm
3)
195.2 cu in (3199 cm
3)
Compression ratio
8.5:1
10:1
Output acc. to SAE J 1349
189 hp / 5800 rpm
(141 kW / 5800 rpm)
215 hp / 5700 rpm
(160 kW / 5700 rpm)
Maximum torque acc. to SAE J 1349
192 lb-ft / 3500 rpm
(260 Nm / 3500 rpm)
229 lb-ft / 3000 rpm
(310 Nm / 3000 rpm)
Maximum engine speed
6000 rpm
6000 rpm
Firing order
1-3-4-2
1-4-3-6-2-5
Poly-V-belt
2420 mm
2380 mm

327
Technical data
Electrical system
 Electrical system
Model
C230Kompressor
C320
Generator (alternator)
14 V/120 A
14 V/120 A
Starter motor
12 V/1.1 kW
12 V/1.7 kW
Battery
12V/100 Ah
12V/100 Ah
Spark plugs
Bosch F 6 MPP 332
Bosch F 8 DPP332
NGK PFR 5 R-11
Electrode gap
0.031 in (0.8 mm)
0.039 in (1.0 mm)
Tightening torque
18 – 22 lb-ft (25 - 30 Nm)
15 – 22 lb-ft (20 – 30 Nm)

344 Technical termsPower trainCollective 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


differential


axle shafts/axles Poly-V-belt drive
Drives engine-components (alternator,
AC compressor, etc.) from the engine.
Program mode selector switch Used to switch the automatic transmis-
sion between standard operation S and
winter operation C.
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-
dant 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 AN-
TI-KNOCK INDEX.
Shift lock When the vehicle is parked, this lock
prevents the gear selector lever from
being moved out of position P without
SmartKey turned and brake pedal de-
pressed.

345
Technical terms
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.
Tele Aid* System (T
elematic A
larm I
dentification on D
e-
mand)
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-
vided that the vehicle’s battery is
charged, properly connected, not dam-
aged and cellular and GPS coverage is
available. 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.).

370 IndexTar stains 252
Technical data 332Brake fluid 332
Coolant 330
Coolants 336
Electrical system 327
Engine 324
Engine oil 332
Engine oil additives 332
Flexible fuel vehicles 334
Fuel requirements 333
Fuels 330
Gasoline additives 334
Lubricants 330
Main dimensions 328
Premium unleaded gasoline 333
Rims and tires 325
Weights 329
Windshield and headlamp washer system 331, 338 Tele Aid
Information 211
Initiating an emergency call manually 209
Roadside assistance 210
Tele Aid System 206
Tele Aid System 345
Tele Aid* 206 Emergency calls 208
Messages in display 283
Remote door unlock 213
Stolen vehicle tracking services 214
System self-check 207
Upgrade signals 212
Telephone* 24, 205 Answering a call 135
Dialing a number from the phone book 136
Emergency call 184
Ending a call 135
Hands-free microphone 27
Loading phone book* 136
Messages in display 283 Operating 134
Operation 179
Redialing 136
Temperature coolant temperature indicator 106
Display mode 123
Grades of tires 340
Setting interior temperature 153
Setting units in display 123
Tires 246
Tightening torque 345
Tightening torque (Wheel bolts) 306
Tilt Backrest 33
Head restraint 34, 36
Seat cushion 33
Time Setting hours 122
Setting minutes 122
Time display Setting 123

373
Index
Wood trims 256
Vehicle jack 286
Vehicle lighting Checking 235
Vehicle tool kit 285 Alignment bolt 285
Spare fuses 285
Special fuse puller 285
Towing eye bolt 285
Vehicle jack 285
Wheel bolts 285
Wheel wrench 285
Vehicle washing 253
Ventilated storage compartment 157
Ventilation Storage compartment 157
VIN (Vehicle Identification Number) 345
Voice control system* 345
Voice recognition system* Hands-free microphone 27 W
Warning sounds
Drivers seat belts 62
Parking brake 47
Warranty coverage 321
Washer fluid see Windshield washer fluid
Washing the vehicle 251
Wear pattern (tires) 246
Weights 329
Wheel change Tightening torque 306
Wheels Rotating 246
Tires and wheels 244
Window curtain airbags 61
Windows see Side windows
Windshield Defogging 153
Refilling washer fluid 243
Replacing wiper blades 300 Washer fluid 243, 338
Washer system 338
Windshield washer fluid 338 Message in display 283
Mixing ratio 338
Refilling 243
Wiping with 50
Windshield washer system 338
Windshield wipers 49 Fast wiper speed 49
Replacing wiper blades 300
Single wipe 50
Switching on 49
Wiping with windshield washer fluid 50
Winter driving 247 Block heater 248
Snow chains 248
Tires 247
Transmission program mode 144
Winter driving instructions 228