Wheels With Central Locking - Porsche 911 Turbo Owner's Manual

Wheels with Central Locking

Wheels with central locking are perfectly normal in
motor sport, but on normal roads they are not
common.
Instead of the central lock nuts conventionally
used in motor sport, the wheel has a central bolt,
with which it is fastened to the wheel carrier. Its
anti-rotation device consists of an element
inserted into the wheel hub with spring-mounted
locking bolt.
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Practical Tips, Emergency Service
Central Bolts
The central bolt and the lock are safety-related
components. Therefore, always check them for
signs of damage.
f The conical surface, trapezoidal thread and
internal toothing of the central bolt must not
exhibit any scratches or cracks.
f Replace damaged central bolts.
Only use the genuine Porsche central bolts
allocated specifically to this vehicle model.
f The conical surface and trapezoidal thread
on the central bolt must be free of any
contamination.
f The central bolt must not contain any grease
except on the trapezoidal thread.
Tightening torque
Tightening torque for central bolts: 370 ftlb.
(500 Nm).