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Loosening wheel nuts
Fig. 233
Tyre change: slacken the wheel
bolts.
Use only the wheel wrench belonging to the
car to loosen the wheel bolts.
Loosen the wheel bolts only about one turn
before raising the vehicle with the jack.
If the wheel bolt is very tight, carefully push on
the end of the wheel wrench with your foot.
Hold on to the vehicle for support and take
care not to slip during this operation.
Loosening wheel nuts
●
Fit the box spanner into the bolt as far as it
›››
will go
Fig. 233.
●
Hold the wrench at the end and rotate
the bolt approximately one turn anticlock-
›››
wise
.
344
Wheels and tyres
Important information about wheel bolts
Factory-fitted rims and wheel bolts are spe-
cially matched during construction. Therefore,
if different rims are fitted, the correct wheel
bolts with the right length and heads must
be used. This ensures that wheels are fitted
securely and that the brake system functions
correctly.
In certain circumstances, you should not even
use wheel bolts from vehicles of the same
model.
WARNING
If the wheel bolts are not properly tightened,
they could come loose while driving and
cause an accident, serious injury and loss of
vehicle control.
●
Use only wheel bolts which correspond to
the rim in question.
●
Never use different wheel bolts.
●
Wheel bolts and threads should be clean,
free of oil and grease, and it should be possi-
ble to screw them easily.
●
To loosen and tighten wheel bolts, only
use the wheel wrench that came with the car
from the factory.
●
The wheel bolts should only be loosened
slightly (about one turn) before raising the
vehicle with the jack. Risk of accident!
●
Never apply grease or oil to wheel bolts or
to the wheel hub threads. Even if the bolts
have been tightened to the prescribed tor-
que, they could come loose while driving.
●
Never loosen the screwed joints of wheel
rims with bolted ring trims.
●
If wheel bolts are tightened below the
prescribed torque, the bolts and rims could
come loose while driving. If tightening torque
is too high, the wheel bolts or threads can be
damaged.
Raise the vehicle
Fig. 234
Jack position points.
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