Get Maintenance and care -> Engine compartment Guide for Mercedes A Class 4 Door Third Generation (2012-2017)

Engine compartment

322

Useful information

WARNING

There are moving components in the engine

compartment. Certain components may con-

tinue to move or suddenly move again even

after the ignition has been switched off, e.g.

the radiator fan. There is a risk of injury.

i This Owner's Manual describes all mod-

els, series and optional equipment for your

vehicle that were available at the time of

going to press. National variations are pos-

sible. Note that your vehicle may not be

equipped with all of the functions descri-

bed. This is also the case for systems and

functions relevant to safety.

If you have to carry out work in the engine

compartment:

switch off the ignition

never touch the dangerous areas surround-

i Read the information on qualified special-

ist workshops: (Y page 24).

ing moving components, e.g. the rotation

area of the fan

remove jewellery and watches

keep items of clothing and hair, for exam-

ple, away from moving parts.

Engine compartment

Bonnet

WARNING

Important safety notes

The ignition system and the fuel injection sys-

tem operate with a high voltage. If you touch

the live components, you could receive an

electric shock. There is a danger of injury.

Never touch components of the ignition sys-

tem or the fuel injection system when the

ignition is switched on.

WARNING

An unlocked bonnet may open up when the

vehicle is in motion and block your view. There

is a risk of an accident.

Never unlock the bonnet when driving. Before

every trip, ensure that the bonnet is locked.

WARNING

Active bonnet (pedestrian protection)

Operating principle

When being opened and closed, the bonnet

may suddenly fall into the closed position.

There is a risk of injury to persons in the range

of movement of the bonnet.

Open and close the bonnet only when nobody

is in the range of movement.

! An active bonnet that had been triggered

must be repaired at a qualified specialist

workshop. The active bonnet function will

then be available again. The additional

pedestrian protection provided by the

active bonnet will then be restored.

WARNING

The active bonnet is only available in certain

countries.

The active bonnet can reduce the risk of injury

to pedestrians in certain accident situations.

Raising the active bonnet increases the clear-

anceto hard components, suchas the engine.

If the active bonnet has been triggered, it is

raised at the rear in the area around the hinge

by approximately 60 mm.

If you open the bonnet while the engine is

overheating or while there is a fire in the

engine compartment, you could come into

contact with hot gases or other leaking ser-

vice products. There is a danger of injury.

Allow an overheating engine to cool down

before opening the bonnet. If there is a fire in

the engine compartment, leave the bonnet

closed and notify the fire brigade.

For the drive to the workshop, reset the trig-

gered active bonnet yourself. If the active

Engine compartment

323

bonnet has been triggered, pedestrian pro-

tection may be limited.

WARNING

When the bonnet is open, and the windscreen

wipers are set in motion, you can be injured by

the wiper linkage. There is a risk of injury.

Always switch off the windscreen wipers and

the ignition before opening the bonnet.

Resetting

WARNING

Certain components in the engine compart-

ment could be very hot, e.g. the engine, the

radiator and parts of the exhaust system.

There is a risk of injury when accessing the

engine compartment.

As far as possible, allow the engine to cool

down and only touch the components descri-

bed in the following.

! Make sure that the windscreen wipers are

not folded away from the windscreen. Oth-

erwise, you could damage the windscreen

wipers or the bonnet.

Make sure that the windscreen wipers are

switched off.

Pull release lever : on the bonnet.

The bonnet is released.

With your hand flat, push down active bon-

net : in the area around the hinges on

both sides (arrows) until you feel it engage.

If you can raise the active bonnet slightly in

the area around the hinges, it is not engaged

correctly. Repeat the step.

If the bonnet can then still be raised, drive

directly to a qualified specialist workshop. Do

not drive faster than 100 km/h.

Opening the bonnet

WARNING

Reach into the gap between the bonnet and

the radiator trim and press bonnet catch

lever ; to the left.

Raise the bonnet.

Certain components in the engine compart-

ment could be very hot, e.g. the engine, the

radiator and parts of the exhaust system.

There is a risk of injury when accessing the

engine compartment.

As far as possible, allow the engine to cool

down and only touch the components descri-

bed in the following.

Engine compartment

324

When checking the oil level:

park the vehicle on a level surface

the engine should be switched off for

approximately five minutes if the engine is

at normal operating temperature.

if the engine is not at normal operating

temperature, e.g. if the engine was only

started briefly, wait approximately

30 minutes before carrying out the meas-

urement

Pull support strut ? out of bracket A.

Lift up support strut ? and insert it into

yellow retaining clip =.

Checking the oil level using the oil dip-

stick

WARNING

Closing the bonnet

Certain components in the engine compart-

ment could be very hot, e.g. the engine, the

radiator and parts of the exhaust system.

There is a risk of injury when accessing the

engine compartment.

As far as possible, allow the engine to cool

down and only touch the components descri-

bed in the following.

Raise the bonnet slightly and, at the same

time, remove support strut ? from yellow

retaining clip =.

Swing support strut ? down and press it

into bracket A until it engages.

Lower the bonnet and let it fall from a

height of approximately 20 cm.

Check that the bonnet has engaged prop-

erly.

If the bonnet can be raised slightly, it is not

properly engaged. Do not press the bonnet

closed. Open the bonnet again and close it

with a little more force.

Engine oil

General notes

Depending on your driving style, the vehicle

consumes up to 0.8 litres of oil per 1,000 km.

The oil consumption may be higher than this

when the vehicle is new or if you frequently

drive at high engine speeds.

Depending on the engine, the oil dipstick may

be installed at a different location.

Engine compartment

325

Slowly slide oil dipstick : into the guide

tube to the stop, and take it out again.

If the level is between MIN mark = and

MAX mark ;, the oil level is correct.

If the oil level has dropped to MIN mark =

or below, top up with 1.0 l of engine oil.

Topping up engine oil

WARNING

Certain components in the engine compart-

ment could be very hot, e.g. the engine, the

radiator and parts of the exhaust system.

There is a risk of injury when accessing the

engine compartment.

Example: vehicles with a petrol engine

As far as possible, allow the engine to cool

down and only touch the components descri-

bed in the following.

WARNING

If engine oil comes into contact with hot com-

ponents in the engine compartment, it may

ignite. There is a risk of fire and injury.

Make sure that engine oil does not spill out

over the filler neck. Allow the engine to cool

down and thoroughly clean the components

that have come into contact with engine oil

before you start the engine.

Vehicles with a diesel engine except A 160 CDI and

A 180 CDI (176.012) models

Environmental note

When topping up the oil, take care not to spill

any. If oil enters the soil or waterways, it is

harmful to the environment.

! Only use engine oils and oil filters that

have been approved for vehicles with a ser-

vice system. You can obtain a list of the

engine oils and oil filters tested and

approved in accordance with the

Mercedes-Benz Specifications for Service

Products at any Mercedes-Benz Service

Centre.

A 160 CDI and A 180 CDI (176.012) models

^XAll models except A 160 CDI and A 180

CDI (176.012): pull out oil dipstick :.

^XA 160 CDI and A 180 CDI (176.012)

models: release the oil filler cap and pull it

out together with integrated oil dipstick :.

Wipe off oil dipstick :.

Engine compartment

326

Damage to the engine or exhaust system is

caused by the following:

Checking and adding other service

products

using engine oils and oil filters that have

not been specifically approved for the

service system

Checking the coolant level

WARNING

changing the engine oil and oil filter after

missing the change interval required by

the service system

The cooling system is pressurised, particu-

larly when the engine is warm. If you open the

cap, you could be scalded if hot coolant

sprays out. There is a risk of injury.

using engine oil additives

Let the engine cool down before you open the

cap. Wear gloves and eye protection. Open

the cap slowly to release the pressure.

! Do not add too much oil. Topping up with

too much engine oil can result in damage to

the engine or to the catalytic converter.

Have excess engine oil siphoned off.

! The coolant level must only be checked

and corrected when the engine has cooled

down (coolant temperature under 40 †).

Checking the coolant level when the cool-

ant temperature is over 40 † can lead to

damage to the engine or engine cooling

system.

Example: engine oil filler cap

Turn cap : anti-clockwise and remove it.

Top up the engine oil.

If the oil level is at or below the MIN mark on

the oil dipstick, top up with 1.0 l of engine

oil.

Example

Replace cap : on the filler neck and turn

clockwise.

Park the vehicle on a level surface.

Make sure that the cap locks securely into

place.

Check the oil level again with the oil dip-

Only check the coolant level if the vehicle is

on a level surface and the engine has

cooled down.

stick (Y page 324).

Turn the key to position 2 in the ignition

For further information on engine oil, see

(Y page 400).

lock (Y page 157).

Check the coolant temperature display in

the instrument cluster.

The coolant temperature must be below

40 †.

Turn the key to position 0 in the ignition

lock (Y page 157).

Maintenance and care -> Engine compartment for Your Mercedes A Class 4 Door Third Generation (2012-2017)

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