Ford Focus Forum, Ford Focus ST Forum, Ford Focus RS Forum - View Single Post - Can you overtighten axle nuts?
View Single Post
Old 11-22-2012, 10:00 AM   #18
Focus Enthusiast
JCH841's Avatar
Join Date: Oct 2010
Fan#: 79303
Location: Suffolk, VA
What I Drive: 2013 Blue ST3

Posts: 505
Points 906, Level 16
Points: 906, Level: 16 Points: 906, Level: 16 Points: 906, Level: 16
Level Up 6% Completed
Level up: 6% Level up: 6% Level up: 6%
Forum Activity 0%
Activity: 0% Activity: 0% Activity: 0%
FF Reputation: 3 JCH841 Good Standing Member
Buy-Sell-Trade Rating: (0)
First of all, it is possible to overtighten anything; that's why they make torque wrenches. Likely not the problem here, but we had a crankshaft failure in a 6000 hp diesel because the factory (over) tightened the connecting rod bolts to the same torque as the main bearing caps and distorted the bearing caps. Most threaded fasteners will develop some adhesion in service; rust, corrosion, heat cycling such that the disassembly torque is likely higher than the assembly torque. In this case if there are any residual stresses or minute fractures from manufacturing/rolling threads, gross overtightening could precipitate a fracture failure.
Growing old is unavoidable. Growing up is optional.
JCH841 is offline  
    Reply With Quote