General Fiat 500c
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General
Fiat 500c
Where’s that from?
If the corresponding thread is okay on its recipient ‘hole’ you could try cleaning threads out with a tap or, if space is restricted, source a stainless bolt and carefully thread it in turning it a quarter in and out again until it’s free…I did this with the mountings for the sump guard on my cross to great effect…but source a new, non stainless bolt, to the same spec, guessing an 8 8 grade
If the corresponding thread is okay on its recipient ‘hole’ you could try cleaning threads out with a tap or, if space is restricted, source a stainless bolt and carefully thread it in turning it a quarter in and out again until it’s free…I did this with the mountings for the sump guard on my cross to great effect…but source a new, non stainless bolt, to the same spec, guessing an 8 8 grade
The bolt is from the upper knuckle joint of the intermediate steering column. It seems when the upper column was replaced prior to our ownership, it was fitted 180 degrees out of alignment and the thread was stripped getting it to fit! I've just replaced the intermediate column and had to turn the steering wheel through 180 degrees to get it to fit properly. Now whenever I turn the steering wheel to the right..the horn sounds!!!
It is natural that over time a screw will seize or break when loosened. In any case, it must be replaced with a specified tensile strength. And tightened with the specified torque. I would never replace a screw of a supposed quality, say 8.8! There is a quality mark on the screws, and you can buy a new one based on this. The 8.8 quality is mostly for structural steel connections. I always buy the screws that need replacement based on the parts catalog of the given car. It is common for cars to use screws with high tensile strength, possibly with low thread pitch (fine thread). In summary, the wear of the screw is natural. But it is not appropriate to put it back if it is broken. It must be replaced in any case.
Grades for automotive bolts, on the metric scale, follow the accepted grading of 1 to 8 and a more recent grading for anything that exceeds 8, classified as 12 (I don’t know why as I haven’t looked it up) the grade used is based on its use, ie for shear, torsion, etc
Yes, that's right. Category 12 bolts have high tensile strength and are fasteners that can withstand high shear forces. For example, chassis and steering. There is a difference of a few hundred Nm between categories 8 and 12 in terms of tensile strength. These are significant differences. Many people downplay it, saying that 100-150 or 200 NM means nothing, these are 10-20% or more differences. And this can be very dangerous. To illustrate its significance. For example, the tightening torque of wheel bolts on most mid-range passenger cars is 120 Nm. When changing a wheel, we can experience that this is not a small amount if we try to open it with a short wheel wrench included in the car's kit. The bolts are designed for dynamic or static loads in vehicles, depending on the expected use. Therefore, it is important that the given fastener is always undamaged and of the same quality as the original.
