I have a chevy fitted with block hugger headers and the bolts which bolt the headers to the collection boxes keep coming loose. 4 on each side
I have welded nuts onto the bottom of the headers so I dont need a spanner to hold them with tightening the bolts from below.
I have tried locktite 623, spring washers, starlock washers but I can seem to stop the bloody bolts from coming loose.
Any bright ideas would be appreciated
loose extractor bolts - HELP
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IcedJohnno
- Trailer Trash
- Posts: 821
- Joined: Tue Oct 11, 2005 12:00 pm
- Location: Christchurch nr the hills
Are the flanges up tight, before and as, the bolts loosen?
If they are, then the bolts must be rotating so there is a remedy.
Drill a small hole in the head of each bolt, tighten appropriately, thread some lockwire thru all four bolts, and perhaps thru some other component as well, then twist the lockwire up tightening the wire. Dont break the wire at this point
This should then do the trick 
If the flanges or whatever the joint is made from, (pipe over pipe), comes loose without the bolts rotating then you need to re-think the jointing method. There must be some fretting going on.
Solid flanges work best, also pipe over pipe with a clamping method.
Perhaps more exhaust supports on the pipes are needed?
If they are, then the bolts must be rotating so there is a remedy.
Drill a small hole in the head of each bolt, tighten appropriately, thread some lockwire thru all four bolts, and perhaps thru some other component as well, then twist the lockwire up tightening the wire. Dont break the wire at this point
This should then do the trick
If the flanges or whatever the joint is made from, (pipe over pipe), comes loose without the bolts rotating then you need to re-think the jointing method. There must be some fretting going on.
Solid flanges work best, also pipe over pipe with a clamping method.
Perhaps more exhaust supports on the pipes are needed?
Tighten them when they are hot??
They may be coming loose when the metals have expanded at running temp.
They may be coming loose when the metals have expanded at running temp.
Last edited by DieselBoy on Mon Dec 12, 2005 9:36 am, edited 1 time in total.
lax2wlg wrote:Is that like saying 'she's hot, for a crackwhore??
Nordlock washers, they are a double washer
Before you use them make certain that the base of your nut and the part its clamping to are clean
If your using welded nuts I'd save IJ's sugestion till the end, as you could break the end of the bolt off in the nut, if you try and undo them later
(the bolts will rust making the thread stiff and when you try to turn that last piece of it through your nut it has a weak piont at the hole)
Another sugestion would be to grind off your nuts and replace them with longer bolts and a couple of strong springs and put the spring inbetween the nut and the flang alot of deseils use this to stop the vibration
As for sealant "maniseal" is cheap and dose the job, or if its a hard to reach bastard job i use "salley's no more nails" just wire brush the dust off the rust and its will stick and you can mould it n it bakes nice and hard with a bit of heat
Hope there's something helpfull there
Cheers Reece
Before you use them make certain that the base of your nut and the part its clamping to are clean
If your using welded nuts I'd save IJ's sugestion till the end, as you could break the end of the bolt off in the nut, if you try and undo them later
(the bolts will rust making the thread stiff and when you try to turn that last piece of it through your nut it has a weak piont at the hole)
Another sugestion would be to grind off your nuts and replace them with longer bolts and a couple of strong springs and put the spring inbetween the nut and the flang alot of deseils use this to stop the vibration
As for sealant "maniseal" is cheap and dose the job, or if its a hard to reach bastard job i use "salley's no more nails" just wire brush the dust off the rust and its will stick and you can mould it n it bakes nice and hard with a bit of heat
Hope there's something helpfull there
Cheers Reece
De-Ranged wrote:Another sugestion would be to grind off your nuts and replace them
Cheers Reece
Yow thats gotta hurt! 
'85 Hilux crawler, 3rz, duals, 4.7's, 4.88's, ARB's, 30 spline Longfields, 6 stud SNR4x4 Histeer, Airshocks up front, coiled rear, 40" Iroks.
^^^this shite is all about to change....^^^
021 273 9942
jafa@inspire.net.nz
^^^this shite is all about to change....^^^
021 273 9942
jafa@inspire.net.nz
Hahaha... I missed that one... Welcome back Jafa.
Castellated nuts? as in the ones they use on tie rod ends. Split pin 'em when they are done up tight, then they can't move. Alternatively use lockwire - a lovely skill I learned in the Air Force. Looks pretty and will hold anything in place when done properly - that stuff holds planes together.
Steve
Castellated nuts? as in the ones they use on tie rod ends. Split pin 'em when they are done up tight, then they can't move. Alternatively use lockwire - a lovely skill I learned in the Air Force. Looks pretty and will hold anything in place when done properly - that stuff holds planes together.
Steve