Fractures of the upper steering column shaft couplingbolt result in a lack of coupling load on the shaft and loss of steeringcontrol.

Steering — Steering Wheel/Handle Bar

Summary
The zinc plating operation performed on the upper steering column shaft coupling bolt caused hydrogen embrittlement and breakage of the bolt.
Actions
Replace the zinc plated bolt with a phosphate plated bolt.
Documents (1)

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Date Announced
FEB 14, 1992
Vehicles Affected
20,000
NHTSA Campaign #
92V015000
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