Mounting wheel on vehicle

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The wheels are mounted using M 14 x 1.5 wheel bolts. The wheel bolt consists of two parts that are permanently connected to each other. Other wheel bolts must not be used.

Use suitable commercially available tools (wrench size 19 mm). Never use an impact bolter to tighten the wheel bolts.

Always apply a thin coat of Optimoly TA (aluminium paste) (arrows) on the thread of the wheel bolts, on the shank and between the bolt head bearing surface and spherical cap ring (under the head). Do not coat the spherical cap surface of the wheel bolts that faces the wheel (X). In the case of heavy soiling, first clean the wheel bolt and the spherical caps in the wheel with a lint-free cloth.

Fig 1: Identifying Spherical Cap Ring On Wheel Bolt

Courtesy of PORSCHE OF NORTH AMERICA, INC.

A Spherical cap ring (captive on wheel bolt)

X Do not grease bearing surface of spherical cap ring that faces the wheel

Damaged wheel bolts must always be replaced. This damage includes mechanical damage to the thread, the spherical cap and damage resulting from seizure of the bolt head bearing surface and spherical cap ring. It must be possible to rotate the spherical cap ring and shift it in axial direction on the bolt shank.

CAUTION: Rework on wheel bolts is impermissible.

Screw in wheel bolts by hand and then tighten evenly. Start at the top when tightening. Always observe the specified tightening torque of 130 Nm (96 ftlb.).