Porsche 911 TURBO - 1975 WORSHOP, Руководство пользователя

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Practical Tips, Minor Repairs
201
Wheel alignment
Uneven tread wear indicates incorrect wheel align-
ment. The vehicle should be checked if this should
be the case.
f Consult a qualified specialist workshop. We
recommend a Porsche partner for this work as
they have trained workshop personnel and the
necessary parts and tools.
Warning!
Risk of accident. You can lose control of the
vehicle.
If, during a journey, uneven running or vibra-
tions occur that could be caused by damage
to tyres or the car:
f Reduce speed immediately, but without
braking sharply.
f Stop the vehicle and check the tyres.
If no cause for the fault can be found, drive
carefully to the nearest qualified specialist
workshop.
We recommend a Porsche partner for this
work as they have trained workshop personnel
and the necessary parts and tools.
Replacing tyres
There is no obligatory standard regarding
permitted top speed above 240 km/h (150 mph)
for tyres of ZR quality.
f Before fitting new tyres, find out about the
current approval status.
f
Use only tyre makes tested and approved by
Porsche.
Basically, only tyres of the same make, same
type and with the same specification number
(e.g. “N0”, “N1”...) can be fitted..
In the initial period, tyres do not have their full
traction.
f
Therefore, do not drive above moderate speed
during the first 100 - 200 km (60 - 120 miles).
If new tyres are fitted to only one axle, the
different tread depths on the two axles can cause
a marked change from the previous driving behav-
iour to which you have become accustomed.
This is particularly true when new tyres are fitted
to the rear axle.
The effect is reduced continuously, however, as
tyre mileage increases.
f Adapt your driving style to the changed
handling.
Tyres should only be fitted by specialist firms.
When a defective tyre is replaced, it should be
noted that deviations in tread depth must not
exceed 30 % on one axle.
f Do not use second-hand tyres if you do not
know their history.
Valves
f Use only plastic valve caps.
The rubber valves must be replaced whenever the
tyres are changed.
In the case of metal valves, please observe the
fitting and replacement instructions.
Use only genuine Porsche metal valves or valves
of the same quality, which are manufactured
according to the specifications and production
demands of Porsche.
f
Protect the valve inserts against contamination
with valve caps.
Soiled valve inserts can cause a gradual loss
of air.