When And Why Is Full Part Replacement Required?

This UHSS rocker reinforcement can only be replaced at a factory seam.
This UHSS rocker reinforcement can only be replaced at a factory seam.

When, and why, is full part replacement required? The Ask I-CAR team is asked this question on a fairly regular basis. Fortunately, there are some answers. Let's take a look at a few reasons why full part replacement is required.

Sometimes, complete part replacement is required simply because the damage warrants it. For example, a front lower rail may have a sectioning procedure, or a partial part at factory seam procedure, but if the damage is beyond both locations, then the full front lower rail would require replacement.

Some vehicle makers will specify that a certain part can only be replaced as full part replacement. This may be due to material or design reasons, or to maintain structural integrity. One common reason for this type of requirement is the use of ultra-high-strength steel (UHSS). With very few exceptions, vehicle makers do not allow straightening or sectioning of UHSS parts. This is mainly due to UHSS sensitivity to heat and its inability to be straightened without cracking.

Finally, if there are no procedures or recommendations available then the only option may be to remove and replace the complete part.

When determining if partial part replacement, either by sectioning or a factory seam, is an option, always refer to the vehicle maker’s collision repair information.


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