Get Maintenance and care -> Engine compartment Guide for Mercedes CLA 4 Door First Generation (2013-2018)

Engine compartment

Bonnet

Important safety notes

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

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.

WARNING

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.

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.

If you have to carry out work in the engine

compartment:

switch off the ignition

never touch the dangerous areas surround-

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.

WARNING

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.

Active bonnet (pedestrian protection)

Operating principle

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 pedes-

trian protection provided by the active bonnet

will then be restored.

The active bonnet is available only in certain

countries.

The active bonnet can reduce the risk of injury to

pedestrians in certain accident situations. Rais-

ing the active bonnet increases the clearance to

hard components, such as 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.

For the drive to the workshop, reset the trig-

gered active bonnet yourself. If the active bon-

net has been triggered, pedestrian protection

may be limited.

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.

280

Engine compartment

Maintenance and care

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 at the

rear 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

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.

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.

Make sure that the windscreen wipers are

not folded away from the windscreen. Other-

wise, you could damage the windscreen wip-

ers or the bonnet.

Make sure that the windscreen wipers are

switched off.

Pull release lever : on the bonnet.

The bonnet is released.

Reach into the gap between the bonnet and

the radiator trim and press bonnet catch

lever ; to the left.

Raise the bonnet.

Pull support strut ? out of bracket A.

Lift up support strut ? and insert it into yel-

low retaining clip =.

Engine compartment

281

Maintenance and care

Closing the bonnet

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 properly.

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.

When checking the oil level:

park the vehicle on a level surface

the engine should be switched off for approx-

imately five minutes if the engine is at normal

operating temperature.

if the engine is not at normal operating tem-

perature, e.g. if the engine was only started

briefly, wait approximately 30 minutesbefore

carrying out the measurement

Checking the oil level using the oil dip-

stick

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.

Example: vehicles with a petrol engine

Example: vehicles with a diesel engine

(except the CLA 180 d model)

Example: CLA 180 d model

All models except CLA 180 d: pull out oil

dipstick :.

The CLA 180 d model: release the oil filler

cap and pull it out together with integrated oil

dipstick :.

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.

282

Engine compartment

Maintenance and care

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.

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.

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.

Use only engine oils and oil filters that are

approved for vehicles with a service system. A

list of the engine oils and oil filters that have

been tested and approved in accordance with

Mercedes-Benz Specifications for Service

Products is available at any Mercedes-Benz

Service Centre.

The following cause engine failure or damage

to the exhaust system:

Use of engine oils and oil filters that have

not been expressly approved for the service

system

Replacement of engine oil and oil filter after

the replacement interval specified by the

service system has expired

Use of engine oil additives

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.

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 lof engine oil.

Replace cap : on the filler neck and turn

clockwise.

Make sure that the cap locks securely into

place.

Check the oil level again with the oil dipstick

(Y page 282).

Further information on engine oil (Y page 330).

Checking and adding other service

products

Checking the coolant level

WARNING

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.

Let the engine cool down before you open the

cap. Wear gloves and eye protection. Open

the cap slowly to release the pressure.

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 coolant tempera-

ture is over 40 † can lead to damage to the

engine or engine cooling system.

Engine compartment

283

Maintenance and care

Park the vehicle on a level surface.

Check the coolant level only if the vehicle is

on a level surface and the engine has cooled

down.

Turn the key to position 2 in the ignition lock

(Y page 133).

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 133).

Slowly turn cap : anti-clockwise and to

relieve excess pressure.

Turn cap : further anti-clockwise and

remove it.

If the coolant is at the level of marker bar =

in the filler neck when cold, there is enough

coolant in coolant expansion tank ;.

If necessary, top up with coolant that has

been tested and approved by Mercedes-Benz.

Replace cap : and turn it clockwise as far as

it will go.

Further information on coolant (Y page 332).

Windscreen washer system

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.

WARNING

If windscreen washer concentrate comes into

contact with hot components of the engine or

the exhaust system, it can ignite. There is a

risk of fire and injury.

Make sure the windscreen washer concen-

trate does not come into contact with the filler

neck.

To open: pull cap : upwards by the tab.

Top up with the premixed washer fluid.

To close: press cap : onto the filler neck

until it engages.

If the washer fluid level drops below the recom-

mended minimum of 1 litre, a message appears

in the multifunction display prompting you to

top up the washer fluid (Y page 246).

Further information on windscreen washer

fluid/antifreeze (Y page 332).

ASSYST PLUS

Service message

The ASSYST PLUS service interval display

informs you of the next service due date.

You can find information on the type of service

and service intervals in the Service Booklet.

You can obtain further information from a

Mercedes-Benz Service Centre.

The ASSYST PLUS service interval display

does not show any information on the engine

oil level. Observe the notes on the engine oil

level (Y page 282).

284

ASSYST PLUS

Maintenance and care

Maintenance and care -> Engine compartment for Your Mercedes CLA 4 Door First Generation (2013-2018)

Related Topics

Popular Owner Manuals

Latest Owner Manuals