Improper Heat Treating Prompts Navistar Recall
Navistar recalled 31,467 trucks and buses across its lineup and General Motors recalled 5,861 medium-duty pickup trucks made by Navistar because improper heat treating on hex flange lock nuts could lead to the fasteners breaking, resulting in unstable steering and the increased possibility of a crash.
The nonconforming hex flange lock nuts, used between January and August 2022, did not fail at the time of vehicle assembly. Navistar quarantined vehicles in its plants on Aug. 26 until it was sure clean parts were being used in production.
GM’s recall covered 2021-2022 model year Chevrolet Silverado Medium Duty 4500HD/5500HD/6500HD vehicles assembled at Navistar’s Springfield, OH, plant.
Navistar dealers will replace all suspect hex flange lock nuts with those made to its design specifications for form and surface hardness.
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