2004 MERCEDES-BENZ C240 4MATIC WAGON torque

262 OperationTires and wheelsTire pressure changes by approx. 1.5 psi
(0.1 bar) per 18°F (10°C) of air tempera-
ture change. Keep this in mind when
checking tire pressure where the tempera-
ture is different from the outside tempera-
ture.
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
become worn over time even if never used,
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
degree 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
ensure proper tire inflation pressure.
Warning!
G
Follow recommended inflation pressures.
Do not overinflate tires. Overinflated tires
can result in sudden deflation (blowout)
because they are more likely to become
punctured 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 indi-
cated 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).
Only use genuine Mercedes-Benz wheel
bolts specified for your vehicle's rims.

322 Practical hintsFlat tire
Unscrew the alignment bolt, install last
wheel bolt and tighten slightly.Lowering the vehicle

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

Remove the jack.
1 - 5Wheel bolts

Tighten the five wheel bolts evenly,
following the diagonal sequence
illustrated (1to5), until all bolts are
tight. Observe a tightening torque
of 80 lb-ft (110 Nm).Before storing the jack, it should be fully
collapsed, with handle folded in (storage
position) (
page 301).

Store the jack and the other vehicle
tools in the storage compartment be-
hind the left trim panel (
page 301).

Store the wheel cover (Canada only)
and the damaged wheel in the cargo
compartment.
Warning!
G
Only use genuine equipment
Mercedes-Benz wheel bolts. Other wheel
bolts may come loose.
Do not tighten the wheel bolts when the
vehicle is raised. Otherwise the vehicle
could tip over.
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).

340 Technical dataEngine
EngineModel
C 240 (203.261)
1
C 240 4MATIC (203.281)
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 320 (203.264)
1
C 320 4MATIC (203.284)
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
2.68 in (68.20 mm)
3.31 in (84.00 mm)
Total piston displacement
158.5 cu in (2 597 cm
3)
195.2 cu in (3 199 cm
3)
Compression ratio
10.5:1
10:1
Output acc. to SAE J 1349
168 hp/5 500 rpm
(125 kW/5 500 rpm)
215 hp/5 700 rpm
(160 kW/5 700 rpm)
Maximum torque acc. to SAE J 1349
177 lb-ft/4 500 rpm
(240 Nm/4 500 rpm)
229 lb-ft/3 000 - 4 600 rpm
(310 Nm/3 000 - 4 600 rpm)
Maximum engine speed
6200 rpm
6000 rpm
Firing order
1-4-3-6-2-5
1-4-3-6-2-5
Poly-V-belt
2380 mm
2380 mm

343 Technical data
Electrical system
Electrical system
Model
C240
C 240 4MATIC
C320
C 320 4MATIC
Generator (alternator)
14 V/120 A
14 V/120 A
Starter motor
12 V/1.7 kW
12 V/1.7 kW
Battery
12 V/100 Ah
12 V/100 Ah
Spark plugs
Bosch F 8 DPP 332
NGK PFR 5 R-11
Bosch F 8 DPP 332
NGK PFR 5 R-11
Electrode gap
0.039 in (1.0 mm)
0.039 in (1.0 mm)
Tightening torque
15–22lb-ft (20–30Nm)
15 – 22 lb-ft (20 – 30 Nm)

360 Technical termsPower train
Collective term designating all
components used to generate and
transmit motive power to the drive
axles, including


engine


clutch/torque converter


transmission


transfer case


drive shaft


differential


axle shafts/axles
Program mode selector switch
Used to switch the automatic trans-
mission between standard operationS
and comfort operationC.Remote Vehicle Diagnostics
Transmission of vehicle data and
current location to the Mercedes-Benz
Customer Assistance Center for
subscribers to Tele Aid service.
REST
(Residual engine heat utilization)
Feature that uses the engine heat
stored in the coolant to heat the
vehicle interior for a short time after
the engine has been turned off.
Restraint systems
Seat belts, belt tensioners, airbags and
child restraint systems. As inde-
pendent systems, their protective
functions 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 deto-
nation (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 gear
selector lever from being moved out of
positionP without SmartKey turned
and brake pedal depressed.
SRS
(S
upplemental R
estraint S
ystem)
Seat belts, emergency tensioning
device and airbags. Though indepen-
dent systems, they are closely inter-
faced to provide effective occupant
protection.

361 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
manual emergency, roadside assis-
tance and information. Tele Aid is
initially activated by completing a
subscriber agreement and placing an
acquaintance call.
The Tele Aid system is operational
provided that the vehicle’s battery is
charged, properly connected, not
damaged and cellular and GPS
coverage is available.Telematics*
A combination of the terms “tele-
communications” 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
approved.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
systems (radio, CD, etc.).

388 Index
Messages in display 299
Operating 136
Operation 189
Redialing 138
Signal strength 137
Temperature
Display mode 125
Grades of tires 356
Setting interior temperature 152
Setting units in display 125
Tires 262
Tie-down rings
(Cargo compartment) 214
Tightening torque (Wheel bolts) 322
Tilt
Head restraint 34
Time
Setting hours 124
Setting minutes 124Time display
Setting 125
Tire inflation pressure
Checking 251, 261
Tire speed rating 243
Tire traction 243
Tires 260, 341
Consumer information 355
Direction of rotation 261
Driving instructions 242
Retreads 260
Rims and tires 341
Service life 261
Temperature 262
Temperature grades 356
Traction 355
Tread depth 263
Wear pattern 262
Winter 263
Tools 300Tow-away alarm 25
Arming 81
Disarming 81
Disarming for transport 81
Tow-away alarm* 81
Towing eye bolt (vehicle tool kit)
Installing 332
Towing the vehicle 329
Tracking services
For stolen vehicle 230
Traction 144, 361
Traction (Tires) 355
Transmission gear selector lever 308
Unlocking manually 308
Transmission see Automatic transmission
Traveling abroad 245
Tread depth (tires) 263
Tread wear 355
Trim panel
Opening 334

391 Index
Wheel change
Tightening torque 322
Wheels
Rotating 262
Tires and wheels 260
Window curtain airbags 62
Windows see Side windows
Windshield
Defogging 153, 162
Refilling washer fluid 259
Replacing wiper blades 317
Washer fluid 259, 354
Washer system 354
Windshield washer fluid 354
Message in display 299
Mixing ratio 354
Refilling 259
Wiping with 48
Windshield washer system 354Windshield wipers 47, 145
Fast wiper speed 47
Rear window wiper/washer 49
Replacing wiper blades 317
Simultaneous wiping and washing 49
Single wipe 48
Switching on 47
Wiping with windshield washer
fluid 48
Winter driving 263
Block heater 264
Snow chains 264
Tires 263
Winter driving instructions 244
Winter tires 263
Wiper blades
Cleaning 270
Installing 317
Removing 317
Replacing 317Wiper/washer
Rear window 49
Wiping
And washing simultaneously 48, 49
Interval 47
With windshield washer fluid 48
Wood trims
Cleaning 272