Bad Night - Found Broken Manifold Stud

[jonnyconcrete]

Home from work, pleased to have received my synchrometer in the post...off to the garage...started the engine and left it to warm up whilst I was sorting my stuff out...air box off...noticed a spitting sound from over by servo...carefully felt around the manifold....erm....

Stuff it, felt the spitting and guessed it was a failed gasket. Engine off, I thought I'll just loosen the manifold bolts and check their condition...erm...

No7 stud was loose, so I thought...oh well easy fix, I'll just tighten it...after about 6 turns I'm thinking this isn't going to tighten!

Guess what, it never did!!


So I have a broken stud...any ideas/solutions?

Stuart

[twincamman]

WELLL COUNTING FROM THE TOP FRONT OF THE ENGINE EXHAUST OR CARB SIDE NUMBER 7 IS AT THE TOP AND EASY TO GET AT ------SO --[I'm assuming the stud hole is stripped]--USE A HIELACOIL OR GO UP TO THE NEXT SIZE STUD --if the stud is broken in the hole careful tapping with a pointed object should remove the offending piece or drill and use an easy out -ed

[john.p.clegg]

...are you sure it's the stud and not the nut that's stripped...

John

[jonnyconcrete]

Bonza...it's the nut...what size is it?

[types26/36]

Bonza...it's the nut...what size is it?

Stud threads into head 5/16 UNC .......Nut threads onto stud 5/16 UNF

[jonnyconcrete]

Thank you Sir!

[alexblack13]

Remember to use the proper brass nuts bud. No nylocks. They will not be nylocks for long.. Good quality spring washers too..

I think I have a few spare brass nuts if you only need 1 or 2..

AB..

[billwill]

I don't have washers at all on my exhaust manifold studs just the brass nuts. I don't recall ever having washers there.

[69S4]

I don't have washers at all on my exhaust manifold studs just the brass nuts. I don't recall ever having washers there.

Not "adding lightness" are you Bill?

[alexblack13]

I use a good quality plated washer 1st against the manifold then a good spring washer, new every time, then a longer version (homemade) nut on a bit longer (again home made) stud. The nuts are 18mm long. And yes I know about the heat effect on the spring washers, but they do take a grip I can assure you.

But hey, what do I know! I'm only a humble mech' eng.


AB....

[GrUmPyBoDgEr]

I use a good quality plated washer 1st against the manifold then a good spring washer, new every time, then a longer version (homemade) nut on a bit longer (again home made) stud. The nuts are 18mm long. And yes I know about the heat effect on the spring washers, but they do take a grip I can assure you.

But hey, what do I know! I'm only a humble mech' eng.


AB....

Colin Chapman:- "You're not taking all of those Washers for a ride on MY CAR!!!"

Errm! the reduction of Components in a Joint enhances the capability of that Joint.
Sorry, had to be said
John

[alexblack13]

Who told you that load of bollocks? Slacknuts!!

& spring washers weigh F all.....

AB....

[Galwaylotus]

Who told you that load of ballocks? Slacknuts!!

No need to get personal and start calling names, Alex!

[alexblack13]

Sorry Shineyheed.. I should know better!

AB..

[GrUmPyBoDgEr]

Who told you that load of bollocks? Slacknuts!!

& spring washers weigh F all.....

AB....

Tried searching for Washers on an Aero Engine Alex

The Weight thing was a "Chapman Quote", something he said to Graham Hill I believe.

I worked in Engine design for 45 Years, probably a bad habit I picked up, but I remember that Spring Washers were banished to the Scrap Heap before I was allowed to push a Pencil across the Paper.
Washers, yes, OK for protecting soft Materials & Load spreading where necessary, with a Brass Nut for example.
If they're available in UNF I'd recommend using Silver plated double Hex. Nimonic self locking Nuts for the Manifold. That's what I have on my Zetec in Metric & lucky enough to have enough for my Twincam in UNF. No Washers & "Tightnuts" (Even when only wearing a Kilt; gets cold here!)

Cheers
John