Porsche 911 TURBO - 1975 WORSHOP, Руководство пользователя

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Practical Tips, Minor Repairs
199
Tyres and Wheels
The service life of the tyres depends on correct
tyre filling pressure, correct wheel alignment and
also your driving style.
Abrupt acceleration, high cornering speeds and
heavy braking increase tyre wear. The tread wear
is also greater at higher outside temperatures and
on rough road surfaces.
Just like the engine, tyres always require the
correct operating conditions. When correctly
treated, they are a long-lived safety component on
your Porsche.
For your own protection and that of other road
users, you must observe the following instruc-
tions.
Load and speed
f Do not overload your vehicle. Be careful about
the roof load. Overloading
+ insufficient tyre pressure
+ high speed
+ high outside temperature
(e.g. holiday driving)
all add up to danger.
Tyre pressure
The tyre pressure must match the prescribed
value. Details on tyre pressure are available in the
left door aperture.
These values are for cold tyres (20 °C (68 °F)).
f Please observe the chapter “TPM TYRE
PRESSURE MONITORING” on page 93.
When tyres are warm, the tyre pressure is
increased.
f Never let air out of hot tyres.
This could cause the tyre pressure to fall below
the prescribed value.
Valve caps protect the valve from dust and dirt,
and thus from leakage.
f Always screw caps down tightly.
f Replace missing caps immediately.
Insufficient tyre filling pressure can cause tyres to
overheat and thus be damaged – even invisibly.
Hidden tyre damage is not eliminated by subse-
quently correcting the tyre pressure.
Tyre damage
High-pressure cleaning units can damage the
tyres.
f Please observe the chapter “HIGH-PRESSURE
CLEANING UNITS” on page 190.
Warning!
Risk of accident due to hidden tyre damage.
Tyres may burst, especially at high speeds.
f Regularly check tyres, including the sidewalls,
for foreign bodies, nicks, cuts, cracks and
bulges.
f
Cross kerb edges slowly and at right angles if
possible.
Avoid driving over steep or sharp kerbs.
f In cases of doubt, have the wheel (particularly
the inner side) checked by an expert.