head - exhaust thread stripped

Seight-V8 · Post by **Seight-V8** » Sat Jan 17, 2009 10:46 am

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

sidecar · Post by **sidecar** » Sat Jan 17, 2009 1:03 pm

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

ian.stewart · Post by **ian.stewart** » Sat Jan 17, 2009 2:43 pm

General rule of thumb. A thread is at its maximum strength after 4 turns,

Seight-V8 · Post by **Seight-V8** » Sat Jan 17, 2009 3:35 pm

thanks guys,

Just gotta wait till the helicoil kit comes, then another job off the list of many.

cheers

scott

Eliot · Post by **Eliot** » Sat Jan 17, 2009 4:22 pm

helicoil it, then locktight a stud in there and then use brass nuts.

sidecar · Post by **sidecar** » Sat Jan 17, 2009 4:54 pm

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

vaultsman · Post by **vaultsman** » Sat Jan 17, 2009 5:37 pm

Rimmers for sure..or..

3/8 UNC Brass Nuts

Stan

sidecar · Post by **sidecar** » Sun Jan 18, 2009 10:47 am

vaultsman wrote:Rimmers for sure..or..

3/8 UNC Brass Nuts

Stan

Cheers!

kiwi303 · Post by **kiwi303** » Tue Jan 27, 2009 5:47 am

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.

The V8 Owners Forum -

head - exhaust thread stripped

head - exhaust thread stripped

Re: head - exhaust thread stripped