Broken diff bits
#9
When you have two large bolts at 120 ft/lbs clamping the whole assembly that little ole M8 bolt isn't adding any structural rigidity to the assembly. Plus the fact there is only one on one end and the fact there is an alignment sleeve that also transfers any load in the spacer to the diff also proves it's not structural.
Also think about how the forces from the diff rising and pulling on the PPF would be transferred to the spacer, it's not even in a direction that would cause that crack
Also think about how the forces from the diff rising and pulling on the PPF would be transferred to the spacer, it's not even in a direction that would cause that crack
#11
What do you see happening without this bolt? How would the problem manifest itself?
#12
I can't explain what forces are causing the piece to break but the fact is they're there. The proof is the photo in the first post. He didn't break that when he took it apart as you suggested. It was already broken. Knowing that they break in service was reason enough for me to replace mine with an undamaged piece.
I'll agree that it's probably they aren't designed to see any load there. Maybe the ppf bolts weren't properly torqued. Maybe the ppf flexes in an odd way that the designer of the part didn't account for. The fact remains that they see forces that break them. In my mind that makes it structure and something worth replacing.
I'll agree that it's probably they aren't designed to see any load there. Maybe the ppf bolts weren't properly torqued. Maybe the ppf flexes in an odd way that the designer of the part didn't account for. The fact remains that they see forces that break them. In my mind that makes it structure and something worth replacing.
#14
I wasn't really expecting a forensic analysis but I'll throw my hat in the ring.
Rust is likely culprit #1, it is a euro fuji diff. Theres oxidation inside the crack so its been like this for a little while, it definitely broke in service.
Improper PPF adjustment is a close second. Ive never actually checked my PPF angle to be honest. Upon install, i slapped it back in place and called it a day.
Another possibility is a pothole. Roads here are not made for scampy sports cars and a land crater could be just enough impulse to crack an already weakened area.
I had no idea this was a common breakage point, so I'm going to replace it in the name of due diligence.
Rust is likely culprit #1, it is a euro fuji diff. Theres oxidation inside the crack so its been like this for a little while, it definitely broke in service.
Improper PPF adjustment is a close second. Ive never actually checked my PPF angle to be honest. Upon install, i slapped it back in place and called it a day.
Another possibility is a pothole. Roads here are not made for scampy sports cars and a land crater could be just enough impulse to crack an already weakened area.
I had no idea this was a common breakage point, so I'm going to replace it in the name of due diligence.
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bbrturbodave1
Suspension, Brakes, Drivetrain
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08-23-2009 09:09 AM