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head - exhaust thread stripped
Posted: Sat Jan 17, 2009 10:46 am
by Seight-V8
hiya all,
yet more problems with my heads...
Just found that one of the exhaust bolt threads is stripped clean out.
the standard 3/8 unc bolt just goes straight in....no turning.
So looks like i either helicoil it or go next bolt size up.
So problem is.
can find a 3/8 unc helicoil but they are only 0.562ins (14.27mm) long
but the bolt is more like 1ins (25mm) long
Will this be enough to tighten the exhaust on with.
Anyone have exprience of this???
cheers
scott
Re: head - exhaust thread stripped
Posted: Sat Jan 17, 2009 1:03 pm
by sidecar
Seight-V8 wrote:hiya all,
yet more problems with my heads...
Just found that one of the exhaust bolt threads is stripped clean out.
the standard 3/8 unc bolt just goes straight in....no turning.
So looks like i either helicoil it or go next bolt size up.
So problem is.
can find a 3/8 unc helicoil but they are only 0.562ins (14.27mm) long
but the bolt is more like 1ins (25mm) long
Will this be enough to tighten the exhaust on with.
Anyone have exprience of this???
cheers
scott
I had a similar problem with an inlet manifold bolt, it won't be a problem as long as the end of the bolt can go past the end of the helicoil.
You should do you self a big favour and buy a load of long 3/8th screws, cut the heads off them and use them as studs in the exhaust holes. Let each one bottom out and then nip it up with two nuts locked together. The result is no more dodgy screwing steel bolts in and out of ali threads!
Pete
Posted: Sat Jan 17, 2009 2:43 pm
by ian.stewart
General rule of thumb. A thread is at its maximum strength after 4 turns,
Posted: Sat Jan 17, 2009 3:35 pm
by Seight-V8
thanks guys,
Just gotta wait till the helicoil kit comes, then another job off the list of many.
cheers
scott
Posted: Sat Jan 17, 2009 4:22 pm
by Eliot
helicoil it, then locktight a stud in there and then use brass nuts.
Posted: Sat Jan 17, 2009 4:54 pm
by sidecar
Eliot wrote:helicoil it, then locktight a stud in there and then use brass nuts.
Brass nuts sound good, do you know where to get them from?
Cheers,
Pete
Posted: Sat Jan 17, 2009 5:37 pm
by vaultsman
Rimmers for sure..or..
3/8 UNC Brass Nuts
Stan
Posted: Sun Jan 18, 2009 10:47 am
by sidecar
Cheers!
Posted: Tue Jan 27, 2009 5:47 am
by kiwi303
sidecar wrote:Eliot wrote:helicoil it, then locktight a stud in there and then use brass nuts.
Brass nuts sound good, do you know where to get them from?
Cheers,
Pete
now the serious answer has been made...
Just wait till a cold night and the balls are freezing off the brass monkeys
otherwise a boat shop generally has them to fit brassware on with.