Re: [Chrysler300] Fine / coarse exhaust studs

Fine Threads ……..They have less of a tendency to loosen under vibration because the smaller lead or thread helix angle provides better wedging action when the assembly is tightened.

That's why they are used on wheel lugs, exhaust manifold studs and a lot of the suspension parts.

Charlie Valentine

On ‎Tuesday‎, ‎July‎ ‎31‎, ‎2018‎ ‎04‎:‎27‎:‎22‎ ‎PM‎ ‎EDT, John Grady jkg@xxxxxxxxxxxxxxxxx [Chrysler300] <Chrysler300-noreply@xxxxxxxxxxxxxxxx> wrote:

Anyone have any idea why they did this ? On exhaust manifold? Later cars just use regular bolts , coarse . Think GM is that way too . Chrysler seems to have had a fascination with fine threads often in strange places like cross member to frame .or carb mount studs . Maybe an edict from Walter way back . They are stronger and less torque for same clamp force . But strip or cross thread easily .lots more parts , cost with studs . Must be a reason ?
I remember some had brass nuts on fine ends on earlier exhaust too .that is good .
I have several that snapped ,( they seem to be hardened steel) We got the remains out ,I am thinking SS bolts , forget all this . With sealer so it will not seize in head, as the studs do ; big fan of Rectorseal plumbing sealer , oil based .
Anyone have any thoughts on this ?

Sent from my iPhone

__._,_.___

Posted by: Charlie V <cv300g@xxxxxxxxx>

To send a message to this group, send an email to: Chrysler300@xxxxxxxxxxxxxxx To unsubscribe from this group, send an email to bob@xxxxxxxxxxxxx or go to https://groups.yahoo.com/neo/groups/all/manage/edit For list server instructions, go to http://www.chrysler300club.com/yahoolist/inst.htm For archives go to http://www.forwardlook.net/300-archive/search.htm#querylang

Visit Your Group

• Privacy • Unsubscribe • Terms of Use