325 Operation
Engine compartment
Engine compartment
Hood
Opening
Warning!G
Do not pull the release lever while the vehi-
cle is in motion. Otherwise the hood could
be forced open by passing air flow.
This could cause the hood to come loose
and injure you and/or others.
Warning!G
If you see flames or smoke coming from the
engine compartment, or if the coolant tem-
perature gauge indicates that the engine is
overheated, do not open the hood. Move
away from vehicle and do not open the hood
until the engine has cooled down. If neces-
sary, call the fire department.
Warning!G
You could be injured when the hood is open
– even when the engine is turned off.
Parts of the engine can become very hot. To
prevent burns, let the engine cool off com-
pletely before touching any components on
the vehicle. Comply with all relevant safety
precautions.
Warning!G
To help prevent personal injury, stay clear of
moving parts when the hood is open and the
engine is running.
The radiator fan may continue to run for ap-
proximately 30 seconds or even restart af-
ter the engine has been turned off. Stay
clear of fan blades.
Warning!G
The engine is equipped with a transistorized
ignition system. Because of the high voltage
it is dangerous to touch any components (ig-
nition coils, spark plug sockets, diagnostic
socket) of the ignition system
with the engine running
while starting the engine
if ignition is “on” and the engine is
cranked manually
473 Technical data
Electrical system
Electrical system
ModelC 2301
C 230 Sport1
C 230 4MATIC1
C 230 4MATIC Sport1
1Canada only.
C 300
C 300 Sport
C 300 4MATIC
C 300 4MATIC SportC 3501
C 350 Sport
C 350 4MATIC1
C 350 4MATIC Sport1
Generator (alternator)14 V/150 A14 V/150 A14 V/150 A
Starter motor12 V/1.4 kW12 V/1.4 kW12 V/1.4 kW
Battery12 V/84 Ah12 V/84 Ah12 V/84 Ah
Spark plugsNGK PLKR 6A
Bosch Platin Y 7 MPP 33NGK PLKR 6A
Bosch Platin Y 7 MPP 33NGK PLKR 6A
Bosch Platin Y 7 MPP 33
Electrode gap0.031 in (0.8 mm)0.031 in (0.8 mm)0.031 in (0.8 mm)
Tightening torque15 – 22 lb-ft (20 – 30 Nm)15 – 22 lb-ft (20 – 30 Nm)15 – 22 lb-ft (20 – 30 Nm)
