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●
Place the spare wheel or temporary spare
wheel into position.
●
Screw in the wheel bolts and tighten them a
little with the wheel wrench.
●
Use the appropriate adapter to tighten the
anti-theft wheel bolts.
●
Carefully lower the vehicle using the jack.
●
Use the wheel spanner to tighten all of the
wheel nuts clockwise. Tighten the bolts in di-
agonal pairs (not in a circle).
●
Put the caps, trim or full hubcap back on.
The wheel bolts should be clean and turn
easily. Before fitting the spare wheel, inspect
the wheel condition and hub mounting surfa-
ces. These surfaces must be clean before fit-
ting the wheel.
Tightening torque of the wheel nuts
The prescribed tightening torque for wheel
bolts for steel and alloy wheels is 140 Nm. After
changing a wheel, have the tightening torque
checked immediately with a torque wrench
that is working perfectly.
Before checking tightening torque, have any
rusty wheel bolts that are difficult to screw re-
placed and clean the wheel hub threads.
Never apply grease or oil to wheel bolts or to
the wheel hub threads. Even if the bolts have
been tightened to the prescribed torque, they
could come loose while driving.
346
Wheels and tyres
Tyres with directional tread pattern
Tyres with directional tread pattern have been
designed to operate best when rotating in only
one direction. An arrow on the tyre sidewall
indicates the direction of rotation on tyres with
directional tread. Always observe the indicated
direction of rotation in order to guarantee op-
timum grip and help avoid aquaplaning, exces-
sive noise and wear.
If the tyre is mounted in the opposite direction
of rotation, drive with extreme caution, as the
tyre is no longer being used correctly. This is of
particular importance when the road surface is
wet. Change the tyre as soon as possible or re-
mount it with the correct direction of rotation.
Works after changing a wheel
●
Replace the hub caps or wheel bolt caps (de-
pending on equipment).
●
Return all tools to their proper storing loca-
tion.
●
If the replaced wheel does not fit in the spare
wheel housing, store it safely in the luggage
›››
compartment
page 274.
●
Check the tyre pressure of the newly moun-
ted tyre as soon as possible.
●
In vehicles fitted with a tyre pressure indica-
tor, adjust the pressure and store it in memory
›››
page 346.
●
Have the tightening torque of the wheel nuts
checked as soon as possible with a torque
›››
wrench
page 345. Meanwhile, drive care-
fully.
●
Have the flat tyre replaced as quickly as pos-
sible.
Tyre pressure monitor sys-
tem
Tyre pressure monitor indicator
Fig. 236
Instrument panel: warning of loss
of tyre pressure.
The tyre pressure monitoring system compares
the individual speeds of each wheel and thus
the dynamic radius with the help of the ABS
sensors.
If the rolling circumference of one or more
wheels has changed, the tyre pressure moni-
toring indicator will indicate this on the instru-
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