busted ARP F/F hub studs WTF!!! (1 Viewer)
- Thread starter VETTE60
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I sheared mine driving on the street turning left while taking off from a stop (69 40 2f 4spd 529s aussies nitro axles and 39" krawlers).
I drilled and tapped for 7/16-20x1.5" cap head bolts and eliminated the cone washers altogether. I also drilled for 100 series 10mm dowels on the side that sheared but have yet to do the passenger side. Not that ive driven it all that much but they havent come loose yet and seem to be doing their job. Just have to upgrade the front now.
I drilled and tapped for 7/16-20x1.5" cap head bolts and eliminated the cone washers altogether. I also drilled for 100 series 10mm dowels on the side that sheared but have yet to do the passenger side. Not that ive driven it all that much but they havent come loose yet and seem to be doing their job. Just have to upgrade the front now.
I busted every hub stud I put in the pig until I went 7/16-20. No problems since, front or rear.
From Machine design on cone washers- For oem application the conical washers serve to prevent loosening.
These washers are used with screws or bolts to increase the elastic properties of the joint. Screw and bolt connections loosen in different ways. Because the initial tightening is done by applying torque, loosening is most often thought to be caused by the bolt or screw backing off. However, all metal and nonmetal components under a steady stress will show some amount of relaxation (creep, cold flow) -- less for hard, smooth surfaces and more for softer and rougher surfaces. A similar effect results from differential thermal expansion/contraction, such as in many piping systems. The typical elastic elongation of a properly tightened screw or bolt is on the order of a few thousandths of an inch, and elastic compression of the clamped parts is usually even less. If the total relaxation approaches the initial elastic deformation, the clamping load will be almost lost. The joint loosens, although no reverse torque or backing off has occurred.
Properly selected spring washers may increase the elastic reserve of a joint by a factor of 10 or more. This means that relaxation that would cause 90% loss of preload without a spring washer will cause a loss of less than 10%.
"Belleville washer" is a term commonly, but incorrectly, applied to conical washers. The Belleville washer has precise dimensional relationships which give it greater spring action with load-bearing strength comparable to a conical washer of the same size.
Some conical washers have an off-center circular plane, creating a secondary system which reinforces and increases the spring action of the basic coned washer.
Another conical washer with a flexible conical rim for initial loads and an arched secondary square cone for secondary loads gives more consistent clamp loads under a variety of conditions. A flat washer used in conjunction with a spring washer may often be replaced with this type of conical washer.
These washers are used with screws or bolts to increase the elastic properties of the joint. Screw and bolt connections loosen in different ways. Because the initial tightening is done by applying torque, loosening is most often thought to be caused by the bolt or screw backing off. However, all metal and nonmetal components under a steady stress will show some amount of relaxation (creep, cold flow) -- less for hard, smooth surfaces and more for softer and rougher surfaces. A similar effect results from differential thermal expansion/contraction, such as in many piping systems. The typical elastic elongation of a properly tightened screw or bolt is on the order of a few thousandths of an inch, and elastic compression of the clamped parts is usually even less. If the total relaxation approaches the initial elastic deformation, the clamping load will be almost lost. The joint loosens, although no reverse torque or backing off has occurred.
Properly selected spring washers may increase the elastic reserve of a joint by a factor of 10 or more. This means that relaxation that would cause 90% loss of preload without a spring washer will cause a loss of less than 10%.
"Belleville washer" is a term commonly, but incorrectly, applied to conical washers. The Belleville washer has precise dimensional relationships which give it greater spring action with load-bearing strength comparable to a conical washer of the same size.
Some conical washers have an off-center circular plane, creating a secondary system which reinforces and increases the spring action of the basic coned washer.
Another conical washer with a flexible conical rim for initial loads and an arched secondary square cone for secondary loads gives more consistent clamp loads under a variety of conditions. A flat washer used in conjunction with a spring washer may often be replaced with this type of conical washer.
I don't think that machine design information applies to the cone washers on the Toyota axles. Different part serving a different function.
