Steering Linkage Recall - HD Ram
I literally had my truck in last week to clean up some more recalls on it. Then this morning my Ram app notifies me that I have yet another recall. Problem with the steering linkage, apparently. No...
Forum Discussion
To the PMs...answering it here
What going beyond Plastic and into yield means...
Fasteners stretch to hold things together. Like pinching two pieces of sheetmetal together with your fingers, or pliers, etc
Staying within the fasteners plastic limits/ratings...it will go back to it's original when the nut is backed off
When going beyond it's plasticity point...it goes into yield. Meaning it will stretch too far and will NOT snap back to it's original length
Also means, say a grade 8 bolt, when tightened (torqued) beyond its plastic limit/rating...it will stretch and become less than a grade 8 fastener. How much lower depends on a few things. Like the size/length/amount of over torque/etc. Might to down to a grade 5...grade 3...or even less if stretched beyond it's limit/ratings enough
This application is NOT a bolt, but the above laws of physics still applies. The threads on the rod and jam nut can still be over torqued...to then lose it's 'grade' rating
Then it has less holding power vs vibration and other forces...that will have it back off over time.
Think that is why they have it welded after checking...or replacing the whole thing...
Might be that the production floor torque wrenches were not adjusted to the correct torque, the designers spec'd out the wrong torque...and my guess is that the torque wrench was not check and re-calibrated or something like that
What going beyond Plastic and into yield means...
Fasteners stretch to hold things together. Like pinching two pieces of sheetmetal together with your fingers, or pliers, etc
Staying within the fasteners plastic limits/ratings...it will go back to it's original when the nut is backed off
When going beyond it's plasticity point...it goes into yield. Meaning it will stretch too far and will NOT snap back to it's original length
Also means, say a grade 8 bolt, when tightened (torqued) beyond its plastic limit/rating...it will stretch and become less than a grade 8 fastener. How much lower depends on a few things. Like the size/length/amount of over torque/etc. Might to down to a grade 5...grade 3...or even less if stretched beyond it's limit/ratings enough
This application is NOT a bolt, but the above laws of physics still applies. The threads on the rod and jam nut can still be over torqued...to then lose it's 'grade' rating
Then it has less holding power vs vibration and other forces...that will have it back off over time.
Think that is why they have it welded after checking...or replacing the whole thing...
Might be that the production floor torque wrenches were not adjusted to the correct torque, the designers spec'd out the wrong torque...and my guess is that the torque wrench was not check and re-calibrated or something like that
