Ingalls camber kit, balljoint-fail.

[wed3k]

time for tubular control arms.

[accordztech]

OEM ones are installed once... I'm sure with proper machinery, not whacked in by a guy with a bench vise and a big hammer.

This involves pressing those out, pressing in the new ones, and introducing the added stress of a camber adjustment. Yes, that thin band of metal will be weakened, and then put under added stress. What do you expect?

So you think the fault lies in using a big hammer to put it back in? Wouldnt using a press to replace the balljoint is the same as using a press at the factory?

I dont remember what I did to Prez's car. But usually I like to heat up the control arm to expand it with mapp gas, then I put the balljoint plate in the freezer for a while. Then I put it in to the control arm and give it a few taps. Then I press it down with the balljoint bolt/stud assymbly to 120 ft/lbs.

[casterX]

Metal Fatigue - http://www.epi-eng.com/mechanical_en..._in_metals.htm


Adjustment of the (Endurance Limit) EL is the result of six fractional factors. Each of these six factors is calculated from known data which describe the influence of a specific condition on fatigue life.

Those factors are:

Surface Condition (ka): such as: polished, ground, machined, as-forged, corroded, etc. Surface is perhaps the most important influence on fatigue life;
Size (kb): This factor accounts for changes which occur when the actual size of the part or the cross-section differs from that of the test specimens;
Load (kc): This factor accounts for differences in loading (bending, axial, torsional) between the actual part and the test specimens;
Temperature (kd): This factor accounts for reductions in fatigue life which occur when the operating temperature of the part differs from room temperature (the testing temperature);
Reliability (ke): This factor accounts for the scatter of test data. For example, an 8% standard deviation in the test data requires a ke value of 0.868 for 95% reliability, and 0.753 for 99.9% reliability.
Miscellaneous (kf): This factor accounts for reductions from all other effects, including residual stresses, corrosion, plating, metal spraying, fretting, and others.



given the above factors: you compromised size by shaving the arm and probably some on temperature when you heated the arm..

[4CYLPOWER92]

given the above factors: you compromised size by shaving the arm and probably some on temperature when you heated the arm..

I agree with this. I know that hitting mine in with a hammer and block of wood did not put any strain on that arm. I didn't have to hit it very hard at all.

[bcjammerx]

no mine were complete a arm replacements actually. And when they failed they failed at the snap ring...it didn't seat deep enough. My ingals though...bolt on...not a budge. I fixed my alignment and pull issue with them.

[accordztech]

I agree with this. I know that hitting mine in with a hammer and block of wood did not put any strain on that arm. I didn't have to hit it very hard at all.

I didnt heat it up that much, maybe for 15 seconds max.

[4CYLPOWER92]

I didnt heat it up that much, maybe for 15 seconds max.

Pretty strange. I thought I remembered about other people grinding off the edge of the arm but this is the first time I've seen this.

If pressing in the kit is the reason, then by that theory the crack should start on the inside and work outward. It looks like the opposite from the pics, which would support the theory it was caused by grinding the edge.